Subject: Re: [Spridgets] Fuel pump

From: Michael MacLean via Spridgets <[email-masked]>
Date: Mon, 11 Jan 2021 03:58:33 +0000 (UTC)

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I had a fuel feed problem with my Bugeye in the recent past.=C2=A0 I am sol=
ving that with a new fuel pump.=C2=A0 Now to the MG.=C2=A0 The fuel pump ru=
nning furiously like the tank is empty never happened when I got the car 7 =
months ago.=C2=A0 It is a recent development.=C2=A0 =C2=A0I really need to =
get under the car and look around.=C2=A0 I'm just whistling in the wind at =
this point.=C2=A0 In the next few days I'll get the car up on my hydraulic =
scissor jacks and start the inspection.=C2=A0 I will let everyone know what=
 I find.=C2=A0 Some on the MG Experience said that it sounded like classic =
vapor lock.=C2=A0 Maybe while sitting in one spot the fuel line becomes hea=
t soaked.=C2=A0 I have no idea the proximity of the fuel lines to the exhau=
st system with this car.=C2=A0=C2=A0Mike M

Sent from AT&T Yahoo Mail on Android=20
=20
  On Sun, Jan 10, 2021 at 5:03 PM, Kevin Valentine<[email-masked]> wr=
ote:   Mike,
I had a Triumph Herald that acted like you describe.=C2=A0
It would occasionally suck air thru a pinhole in the fuel line between the =
tank and the pump.=C2=A0 =C2=A0It was a metal fuel line that was rusted jus=
t enough for a pinhole to form.=C2=A0 The pinhole was at a point in the=C2=
=A0line that was above the fuel tank, so it did not leak fuel.=C2=A0 =C2=A0=
The=C2=A0 pump was mechanical and would not re-prime itself.=C2=A0 I would=
=C2=A0=C2=A0blow into the fuel filler until I pushed enough fuel to the fro=
nt of the car to prime the pump and restart the engine.......=C2=A0 I was 1=
6 years old and knew nothing about British cars......=C2=A0 (Still don't).
I had another British car that would occasionally act the same way.=C2=A0 I=
t turned out,=C2=A0 the vented fuel cap had been blocked with rust and the =
car would stop running after a short drive if the tank was near full.=C2=A0=
 It took me a while to find the problem, but the best hint was, the=C2=A0mo=
re fuel that was in the tank the shorter the distance the car would travel =
before stopping.=C2=A0 The more air that was in the tank, the longer it too=
k for the fuel to stop flowing.
How often does it act like this?=C2=A0 =C2=A0I seem to remember you having =
a problem like this a short time ago????
KevinTuscarora, Pa =20

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I had a fuel feed problem with my Bugeye in the recent past.&nbsp; I am sol=
ving that with a new fuel pump.&nbsp; Now to the MG.&nbsp; The fuel pump ru=
nning furiously like the tank is empty never happened when I got the car 7 =
months ago.&nbsp; It is a recent development.&nbsp; &nbsp;I really need to =
get under the car and look around.&nbsp; I'm just whistling in the wind at =
this point.&nbsp; In the next few days I'll get the car up on my hydraulic =
scissor jacks and start the inspection.&nbsp; I will let everyone know what=
 I find.&nbsp; Some on the MG Experience said that it sounded like classic =
vapor lock.&nbsp; Maybe while sitting in one spot the fuel line becomes hea=
t soaked.&nbsp; I have no idea the proximity of the fuel lines to the exhau=
st system with this car.&nbsp;&nbsp;<div id=3D"yMail_cursorElementTracker_1=
610337496895">Mike M<br><br><div id=3D"ymail_android_signature"><a id=3D"ym=
ail_android_signature_link" href=3D"https://go.onelink.me/107872968?pid=3DI=
nProduct&amp;c=3DGlobal_Internal_YGrowth_AndroidEmailSig__AndroidUsers&amp;=
af_wl=3Dym&amp;af_sub1=3DInternal&amp;af_sub2=3DGlobal_YGrowth&amp;af_sub3=
=3DEmailSignature">Sent from AT&amp;T Yahoo Mail on Android</a></div> <br> =
<blockquote style=3D"margin: 0 0 20px 0;"> <div style=3D"font-family:Roboto=
, sans-serif; color:#6D00F6;"> <div>On Sun, Jan 10, 2021 at 5:03 PM, Kevin =
Valentine</div><div>&lt;[email-masked]&gt; wrote:</div> </div> <div s=
tyle=3D"padding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px solid =
#6D00F6;"> <div id=3D"yiv9001000893"><div dir=3D"ltr">Mike,<div><br></div><=
div>I had a Triumph Herald that acted like you describe.&nbsp;</div><div><b=
r></div><div>It would occasionally suck air thru a pinhole in the fuel line=
 between the tank and the pump.&nbsp; &nbsp;It was a metal fuel line that w=
as rusted just enough for a pinhole to form.&nbsp; The pinhole was at a poi=
nt in the&nbsp;line that was above the fuel tank, so it did not leak fuel.&=
nbsp; &nbsp;The&nbsp; pump was mechanical and would not re-prime itself.&nb=
sp; I would&nbsp;&nbsp;blow into the fuel filler until I pushed enough fuel=
 to the front of the car to prime the pump and restart the engine.......&nb=
sp; I was 16 years old and knew nothing about British cars......&nbsp; (Sti=
ll don't).</div><div><br></div><div>I had another British car that would oc=
casionally act the same way.&nbsp; It turned out,&nbsp; the vented fuel cap=
 had been blocked with rust and the car would stop running after a short dr=
ive if the tank was near full.&nbsp; It took me a while to find the problem=
, but the best hint was, the&nbsp;more fuel that was in the tank the shorte=
r the distance the car would travel before stopping.&nbsp; The more air tha=
t was in the tank, the longer it took for the fuel to stop flowing.</div><d=
iv><br></div><div>How often does it act like this?&nbsp; &nbsp;I seem to re=
member you having a problem like this a short time ago????</div><div><br></=
div><div>Kevin</div><div>Tuscarora, Pa</div></div>
</div> </div> </blockquote></div>
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[email-masked]

Archive: http://www.team.net/pipermail/spridgets  http://autox.team.net/archive

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From: Weslake1330 via Spridgets <[email-masked]>
Date: Mon, 11 Jan 2021 16:36:17 +0000

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I'm with the clogged filter diagnosis.  My experience with a pin hole in
the fuel line (rubbed by the handbrake rod) was that I'd get fuel
starvation at high rpm/high speed.

On Mon, 11 Jan 2021 at 01:04, Kevin Valentine via Spridgets <
[email-masked]> wrote:

> Mike,
>
> I had a Triumph Herald that acted like you describe.
>
> It would occasionally suck air thru a pinhole in the fuel line between the
> tank and the pump.   It was a metal fuel line that was rusted just enough
> for a pinhole to form.  The pinhole was at a point in the line that was
> above the fuel tank, so it did not leak fuel.   The  pump was mechanical
> and would not re-prime itself.  I would  blow into the fuel filler until I
> pushed enough fuel to the front of the car to prime the pump and restart
> the engine.......  I was 16 years old and knew nothing about British
> cars......  (Still don't).
>
> I had another British car that would occasionally act the same way.  It
> turned out,  the vented fuel cap had been blocked with rust and the car
> would stop running after a short drive if the tank was near full.  It took
> me a while to find the problem, but the best hint was, the more fuel that
> was in the tank the shorter the distance the car would travel before
> stopping.  The more air that was in the tank, the longer it took for the
> fuel to stop flowing.
>
> How often does it act like this?   I seem to remember you having a problem
> like this a short time ago????
>
> Kevin
> Tuscarora, Pa
> ------------------------
>
> [email-masked]
>
> Donate: http://www.team.net/donate.html
> Suggested annual donation: $12.75
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/spridgets/[email-masked]
>

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<div dir=3D"ltr">I&#39;m with the clogged filter diagnosis.=C2=A0 My experi=
ence with a pin hole in the fuel line (rubbed by the handbrake rod) was tha=
t I&#39;d get fuel starvation at high rpm/high speed.</div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, 11 Jan 2021 =
at 01:04, Kevin Valentine via Spridgets &lt;<a href=3D"mailto:spridgets@aut=
ox.team.net">[email-masked]</a>&gt; wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Mike,<div><br></div><=
div>I had a Triumph Herald that acted like you describe.=C2=A0</div><div><b=
r></div><div>It would occasionally suck air thru a pinhole in the fuel line=
 between the tank and the pump.=C2=A0 =C2=A0It was a metal fuel line that w=
as rusted just enough for a pinhole to form.=C2=A0 The pinhole was at a poi=
nt in the=C2=A0line that was above the fuel tank, so it did not leak fuel.=
=C2=A0 =C2=A0The=C2=A0 pump was mechanical and would not re-prime itself.=
=C2=A0 I would=C2=A0=C2=A0blow into the fuel filler until I pushed enough f=
uel to the front of the car to prime the pump and restart the engine.......=
=C2=A0 I was 16 years old and knew nothing about British cars......=C2=A0 (=
Still don&#39;t).</div><div><br></div><div>I had another British car that w=
ould occasionally act the same way.=C2=A0 It turned out,=C2=A0 the vented f=
uel cap had been blocked with rust and the car would stop running after a s=
hort drive if the tank was near full.=C2=A0 It took me a while to find the =
problem, but the best hint was, the=C2=A0more fuel that was in the tank the=
 shorter the distance the car would travel before stopping.=C2=A0 The more =
air that was in the tank, the longer it took for the fuel to stop flowing.<=
/div><div><br></div><div>How often does it act like this?=C2=A0 =C2=A0I see=
m to remember you having a problem like this a short time ago????</div><div=
><br></div><div>Kevin</div><div>Tuscarora, Pa</div></div>
------------------------<br>
<br>
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ox.team.net</a><br>
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Archive: <a href=3D"http://www.team.net/pipermail/spridgets" rel=3D"norefer=
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[email-masked]

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---

From: Weslake1330 via Spridgets <[email-masked]>
Date: Mon, 11 Jan 2021 16:37:19 +0000

--===============5636450070587099413==

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My vapour lock experiences sound just like you recent problem except the
pump speed was normal, so I'm still in favour of clogging.

On Mon, 11 Jan 2021 at 03:59, Michael MacLean via Spridgets <
[email-masked]> wrote:

> I had a fuel feed problem with my Bugeye in the recent past.  I am solving
> that with a new fuel pump.  Now to the MG.  The fuel pump running furiously
> like the tank is empty never happened when I got the car 7 months ago.  It
> is a recent development.   I really need to get under the car and look
> around.  I'm just whistling in the wind at this point.  In the next few
> days I'll get the car up on my hydraulic scissor jacks and start the
> inspection.  I will let everyone know what I find.  Some on the MG
> Experience said that it sounded like classic vapor lock.  Maybe while
> sitting in one spot the fuel line becomes heat soaked.  I have no idea the
> proximity of the fuel lines to the exhaust system with this car.
> Mike M
>
> Sent from AT&T Yahoo Mail on Android
> <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature>
>
> On Sun, Jan 10, 2021 at 5:03 PM, Kevin Valentine
> <[email-masked]> wrote:
> Mike,
>

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<div dir=3D"ltr">My vapour lock experiences sound just like you recent prob=
lem except the pump speed was normal, so I&#39;m still in favour of cloggin=
g.</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr=
">On Mon, 11 Jan 2021 at 03:59, Michael MacLean via Spridgets &lt;<a href=
=3D"mailto:[email-masked]">[email-masked]</a>&gt; wrote=
:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.=
8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I had a fuel f=
eed problem with my Bugeye in the recent past.=C2=A0 I am solving that with=
 a new fuel pump.=C2=A0 Now to the MG.=C2=A0 The fuel pump running furiousl=
y like the tank is empty never happened when I got the car 7 months ago.=C2=
=A0 It is a recent development.=C2=A0 =C2=A0I really need to get under the =
car and look around.=C2=A0 I&#39;m just whistling in the wind at this point=
.=C2=A0 In the next few days I&#39;ll get the car up on my hydraulic scisso=
r jacks and start the inspection.=C2=A0 I will let everyone know what I fin=
d.=C2=A0 Some on the MG Experience said that it sounded like classic vapor =
lock.=C2=A0 Maybe while sitting in one spot the fuel line becomes heat soak=
ed.=C2=A0 I have no idea the proximity of the fuel lines to the exhaust sys=
tem with this car.=C2=A0=C2=A0<div id=3D"gmail-m_1818996970332864076yMail_c=
ursorElementTracker_1610337496895">Mike M<br><br><div id=3D"gmail-m_1818996=
970332864076ymail_android_signature"><a id=3D"gmail-m_1818996970332864076ym=
ail_android_signature_link" href=3D"https://go.onelink.me/107872968?pid=3DI=
nProduct&amp;c=3DGlobal_Internal_YGrowth_AndroidEmailSig__AndroidUsers&amp;=
af_wl=3Dym&amp;af_sub1=3DInternal&amp;af_sub2=3DGlobal_YGrowth&amp;af_sub3=
=3DEmailSignature" target=3D"_blank">Sent from AT&amp;T Yahoo Mail on Andro=
id</a></div> <br> <blockquote style=3D"margin:0px 0px 20px"> <div style=3D"=
font-family:Roboto,sans-serif;color:rgb(109,0,246)"> <div>On Sun, Jan 10, 2=
021 at 5:03 PM, Kevin Valentine</div><div>&lt;<a href=3D"mailto:kevinv1275@=
gmail.com" target=3D"_blank">[email-masked]</a>&gt; wrote:</div> </di=
v> <div style=3D"padding:10px 0px 0px 20px;margin:10px 0px 0px;border-left:=
1px solid rgb(109,0,246)"> <div id=3D"gmail-m_1818996970332864076yiv9001000=
893"><div dir=3D"ltr">Mike,<div><br></div><div>I had a Triumph Herald that =
acted like you describe.=C2=A0</div><div><br></div><div>It would occasional=
ly suck air thru a pinhole in the fuel line between the tank and the pump.=
=C2=A0 =C2=A0It was a metal fuel line that was rusted just enough for a pin=
hole to form.=C2=A0 The pinhole was at a point in the=C2=A0line that was ab=
ove the fuel tank, so it did not leak fuel.=C2=A0 =C2=A0The=C2=A0 pump was =
mechanical and would not re-prime itself.=C2=A0 I would=C2=A0=C2=A0blow int=
o the fuel filler until I pushed enough fuel to the front of the car to pri=
me the pump and restart the engine.......=C2=A0 I was 16 years old and knew=
 nothing about British cars......=C2=A0 (Still don&#39;t).</div><div><br></=
div><div>I had another British car that would occasionally act the same way=
.=C2=A0 It turned out,=C2=A0 the vented fuel cap had been blocked with rust=
 and the car would stop running after a short drive if the tank was near fu=
ll.=C2=A0 It took me a while to find the problem, but the best hint was, th=
e=C2=A0more fuel that was in the tank the shorter the distance the car woul=
d travel before stopping.=C2=A0 The more air that was in the tank, the long=
er it took for the fuel to stop flowing.</div><div><br></div><div>How often=
 does it act like this?=C2=A0 =C2=A0I seem to remember you having a problem=
 like this a short time ago????</div><div><br></div><div>Kevin</div><div>Tu=
scarora, Pa</div></div>
</div> </div> </blockquote></div>------------------------<br>
<br>
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ox.team.net</a><br>
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Archive: <a href=3D"http://www.team.net/pipermail/spridgets" rel=3D"norefer=
rer" target=3D"_blank">http://www.team.net/pipermail/spridgets</a>=C2=A0 <a=
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[email-masked]

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From: Michael MacLean via Spridgets <[email-masked]>
Date: Tue, 12 Jan 2021 22:57:00 +0000 (UTC)

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 After a cursory inspection today I found a non SU type electric pump.=C2=
=A0 Looks like a large Facet type, but I can't be sure.=C2=A0 I also found =
that there are no filters anywhere between the tank to the Weber.=C2=A0 I r=
emoved the cylindrical mesh filter in the Weber and it was absolutely clean=
.=C2=A0 So I started it up cold and for the first time right after start it=
 idled a little over 500 rpm.=C2=A0 Usually with the jets (probably wrong o=
nes) in the Weber startups have not been under 1000 rpm at idle in the past=
.=C2=A0 The pump was clicking away as normal.=C2=A0 It has rubber type fuel=
 hose on either side of the pump which should not present a problem.=C2=A0 =
Don't want to, but might have to drop the fuel tank and have a look see.
Mike MacLean

    On Monday, January 11, 2021, 4:08:30 AM PST, GUY DAY <grday@btinternet.=
com> wrote: =20
=20
 #yiv6303893106 p{margin:0;}Hi Mike,
Please let us know what the problem / solution is after your examination. I=
 don't know about any-one else but I would really like to know.

I wouldn't jump towards the blocked pickup if only because at a low speed f=
uel suction should be less than it is on the drive home. I take it you have=
 a standard SU pump mounted in the normal under 'rear seat' position. If yo=
u have that would lean me further towards the fuel vaporization in the pump=
 or pipework leading to it.=20

Best of luck in searching,

Guy R Day

------ Original Message ------
From: "Michael MacLean" <[email-masked]>
To: [email-masked]
Sent: Monday, 11 Jan, 21 At 10:57
Subject: Re: Fuel pump

I think you have the most thoughtful explanation so far. I will be under th=
e car in the next few days and check for a leak in the fuel line or it's pr=
oximity to the exhaust. After it finally started the car ran normally all t=
he way home. I doubt it was the diaphragm. Clogged pickup or vaporized fuel=
 is more likely. Thanks for that.Mike M

Sent from AT&T Yahoo Mail on Android=20
=20
  On Mon, Jan 11, 2021 at 2:37 AM, GUY DAY<[email-masked]> wrote:   M=
ike,

Let us consider this as the problem you experience rather than something at=
 which we can throw random ideas (what is the first thing I do - throw in a=
 random idea!) or past histories of different problems. If you are sat with=
 the engine idling or with minimal use when inching forwards, the pump tick=
ing should slow considerably.

Your wonderful description of the pump 'running furiously' suggests racing =
rather than running fast and that means no liquid fuel is in there. The pum=
p will only race when it has no fuel inside it as the viscosity of the liqu=
id stops it. If it is filling empty carbs or trying to compress a vaporized=
 fuel line forward of the pump it will speed up but not race as there is fu=
el stopping the diaphragms from moving too quickly/racing. If it slowly bui=
lds up to racing it may suggest the fuel level in the pump is lowering as l=
iquid fuel is pumped out and/or that that liquid fuel has stopped getting t=
o the pump.

Possible reason:=20

It can race if the fuel in the pump or the line between tank and pump has v=
aporized - the viscosity of the liquid fuel has gone leaving a gas behind. =
Is the exhaust pipe underneath it? You had a warm up run before you reached=
 the slow moving line, exhaust heat is high. There is no air flow under the=
 car to cool it down, radiated and convected heat is heating up things near=
 to the exhaust - but I am presuming your exhaust runs in the proximity of =
the pump. But I'll bet the slow moving line you were in sheltered you from =
any ground level side drafts to allow cooler air to reach under the car and=
 the pump.=20

Other possible reasons:

Tank side fuel line with a pinhole allowing occasional air to get in. I wou=
ld have thought rather unlikely. A damp patch around the fuel line may be e=
vident.

Filler cap vent blocked. Reasonably common.=20

Filter in tank gets blocked. Has the tank has been relined with with a 'slo=
sh liquid' and filter not kept clear? A build up of original crud may be no=
t enough.

Some pumps have a mesh filter on the pump side of the inlet union.=20

Flexible pipe kinked or blocked. Unlikely as liquid fuel loss is at low spe=
ed.

Split pump diaphragm. Why should it mend as the motor runs at normal speed =
again?=20

What the solution is without have a good 'look at' session I don't know. Th=
at it came in when fuel demand is at its lowest, ie the car isn't moving, c=
ould well be the key clue. Looking at something between the fuel in the tan=
k and the pump is indicated, be it exhaust pipe heat or whatever.....=20

Hope it helps.

Guy R Day

 =20

 =20
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<html><head></head><body><div class=3D"ydpfd65bc6dyahoo-style-wrap" style=
=3D"font-family:times new roman, new york, times, serif;font-size:16px;"><d=
iv id=3D"ydpfd65bc6dyiv6303893106"><div><div class=3D"ydpfd65bc6dyiv6303893=
106ydpeddf9901yahoo-style-wrap" style=3D"font-family:times new roman, new y=
ork, times, serif;font-size:16px;"><div></div>
        <div dir=3D"ltr"><div><div dir=3D"ltr">After a cursory inspection t=
oday I=20
found a non SU type electric pump.&nbsp; Looks like a large Facet type, but=
 I
 can't be sure.&nbsp; I also found that there are no filters anywhere betwe=
en
 the tank to the Weber.&nbsp; I removed the cylindrical mesh filter in the=
=20
Weber and it was absolutely clean.&nbsp; So I started it up cold and for th=
e=20
first time right after start it idled a little over 500 rpm.&nbsp; Usually=
=20
with the jets (probably wrong ones) in the Weber startups have not been=20
under 1000 rpm at idle in the past.&nbsp; The pump was clicking away as=20
normal.&nbsp; It has rubber type fuel hose on either side of the pump which=
=20
should not present a problem.&nbsp; Don't want to, but might have to drop t=
he=20
fuel tank and have a look see.<br clear=3D"none"></div>Mike MacLean</div><d=
iv><br clear=3D"none"></div></div><div><br clear=3D"none"></div>
       =20
        </div></div></div></div><div class=3D"yiv6303893106yqt2571889926" i=
d=3D"yiv6303893106yqt57243"><div class=3D"yiv6303893106yahoo_quoted" id=3D"=
yiv6303893106yahoo_quoted_0614701544">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                    On Monday, January 11, 2021, 4:08:30 AM PST, GUY DAY &l=
t;[email-masked]&gt; wrote:
                </div>
                <div><br clear=3D"none"></div>
                <div><br clear=3D"none"></div>
                <div><div id=3D"yiv6303893106"><div><div class=3D"yiv630389=
3106auto-created-dir-div" style=3D"unicode-bidi:embed;"><style>#yiv63038931=
06  p{margin:0;}</style>Hi Mike,<div><p>Please let us know what the problem=
 / solution is after your examination.  I don't know about any-one else but=
 I would really like to know.</p><p><br clear=3D"none"></p><p>I wouldn't ju=
mp towards the blocked pickup if only because at a low speed fuel suction s=
hould be less than it is on the drive home.   I take it you have a standard=
 SU pump mounted in the normal under 'rear seat' position.  If you have tha=
t would lean me further towards the fuel vaporization in the pump or pipewo=
rk leading to it. </p><div><br clear=3D"none"></div><p>Best of luck in sear=
ching,</p><p><br clear=3D"none"></p><p>Guy R Day</p><blockquote style=3D"ma=
rgin:0 auto;padding:0 2em;border-left:2px solid #00ADE5;white-space:pre-wra=
p;"><br clear=3D"none"><div class=3D"yiv6303893106yqt9444842004" id=3D"yiv6=
303893106yqtfd65412"><br clear=3D"none">------ Original Message ------<br c=
lear=3D"none">From: "Michael MacLean" &lt;[email-masked]&gt;<br cl=
ear=3D"none">To: [email-masked]<br clear=3D"none">Sent: Monday, 11 Ja=
n, 21 At 10:57<br clear=3D"none">Subject: Re: Fuel pump<br clear=3D"none"><=
br clear=3D"none">I think you have the most thoughtful explanation so far. =
 I will be under the car in the next few days and check for a leak in the f=
uel line or it's proximity to the exhaust.  After it finally started the ca=
r ran normally all the way home.  I doubt it was the diaphragm.  Clogged pi=
ckup or vaporized fuel is more likely. Thanks for that.<div id=3D"yiv630389=
3106yMail_cursorElementTracker_1610362627286">Mike M<br clear=3D"none"><br =
clear=3D"none"><div id=3D"yiv6303893106ymail_android_signature"><a rel=3D"n=
ofollow noopener noreferrer" shape=3D"rect" id=3D"yiv6303893106ymail_androi=
d_signature_link" target=3D"_blank" href=3D"https://go.onelink.me/107872968=
?pid=3DInProduct&amp;c=3DGlobal_Internal_YGrowth_AndroidEmailSig__AndroidUs=
ers&amp;af_wl=3Dym&amp;af_sub1=3DInternal&amp;af_sub2=3DGlobal_YGrowth&amp;=
af_sub3=3DEmailSignature">Sent from AT&amp;T Yahoo Mail on Android</a></div=
> <br clear=3D"none"> <blockquote style=3D"margin:0 0 20.0px 0;"> <div styl=
e=3D"font-family:Roboto , sans-serif;color:rgb(109,0,246);"> <div>On Mon, J=
an 11, 2021 at 2:37 AM, GUY DAY</div><div>&lt;<span class=3D"yiv6303893106w=
t_Email">[email-masked]</span><span></span>&gt; wrote:</div> </div> <=
div style=3D"padding:10.0px 0 0 20.0px;margin:10.0px 0 0 0;border-left:1.0p=
x solid rgb(109,0,246);"> <div id=3D"yiv6303893106"><div class=3D"yiv630389=
3106yqt9566648195" id=3D"yiv6303893106yqtfd41674"></div><div><div class=3D"=
yiv6303893106auto-created-dir-div" style=3D"unicode-bidi:embed;"><div class=
=3D"yiv6303893106yqt9566648195" id=3D"yiv6303893106yqtfd91069">Mike,</div><=
div><p><br clear=3D"none"></p><p>Let us consider this as the problem you ex=
perience rather than something at which we can throw random ideas (what is =
the first thing I do - throw in a random idea!) or past histories of differ=
ent problems.  If you are sat with the engine idling or with minimal use wh=
en inching forwards, the pump ticking should slow considerably.</p><div><p>=
<span style=3D"display:inline;">Your wonderful description of the pump 'run=
ning furiously' suggests racing rather than running fast and that means no =
liquid fuel is in there.  </span>The pump will only race when it has no fue=
l inside it as the viscosity of the liquid stops it.  If it is filling empt=
y carbs or trying to compress a vaporized fuel line forward of the pump it =
will speed up but not race as there is fuel stopping the diaphragms from mo=
ving too quickly/racing.  If it slowly builds up to racing it may suggest t=
he fuel level in the pump is lowering as liquid fuel is pumped out and/or t=
hat that liquid fuel<span style=3D"display:inline;"> has stopped getting to=
 the pump.</span></p><p><span style=3D"display:inline;">Possible reason: </=
span></p><p><span style=3D"display:inline;">It can race if the fuel in the =
pump or the line between tank and pump has vaporized  - the viscosity of th=
e liquid fuel has gone leaving a gas behind.  Is the exhaust pipe underneat=
h it?  You had a warm up run before you reached the slow moving line, exhau=
st heat is high.  There is no air flow under the car to cool it down, radia=
ted and convected heat is heating up things near to the exhaust - but I am =
presuming your exhaust runs in the proximity of the pump.  But I'll bet the=
 slow moving line you were in sheltered you from any ground level side draf=
ts to allow cooler air to reach under the car and the pump.  </span><br cle=
ar=3D"none"></p><p><br clear=3D"none"></p><p>Other possible reasons:</p><p>=
Tank side fuel line with a pinhole allowing occasional air to get in.  I wo=
uld have thought rather unlikely.  A damp patch around the fuel line may be=
 evident.</p><p>Filler cap vent blocked.   Reasonably common. </p><p>Filter=
 in tank gets blocked.  Has the tank has been relined with with a 'slosh li=
quid' and filter not kept clear?  A build up of original crud may be not en=
ough.</p><p>Some pumps have a mesh filter on the pump side of the inlet uni=
on. </p><p>Flexible pipe kinked or blocked.  Unlikely as liquid fuel loss i=
s at low speed.</p><p>Split pump diaphragm.  Why should it mend as the moto=
r runs at normal speed again?  </p><p><br clear=3D"none"></p><p>What the so=
lution is without have a good 'look at' session I don't know. That it came =
in when fuel demand is at its lowest, ie the car isn't moving, could well b=
e the key clue.  Looking at something between the fuel in the tank and the =
pump is indicated, be it exhaust pipe heat or whatever.....  </p><p><br cle=
ar=3D"none"></p><blockquote style=3D"margin:0 auto;padding:0 2.0em;border-l=
eft:2.0px solid rgb(0,173,229);"><div id=3D"yiv6303893106yMail_cursorElemen=
tTracker_1610337496895"><div id=3D"yiv6303893106ymail_android_signature">Ho=
pe it helps.</div><p><br clear=3D"none"></p><p>Guy R Day</p></div></blockqu=
ote></div></div></div></div></div> </div> </blockquote></div></div></blockq=
uote></div></div></div></div></div>
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