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Dunno.=C2=A0 What model fuel pump is it?=C2=A0 Is it one of those pulsing =
models?=C2=A0 Those I think just use the spring to determine the pressure.=
=C2=A0 The only thing that could cause those to over pressure would be a pi=
ece of debris caught in the spring.
A rotary style most likely has a pressure relief valve.=C2=A0 If the valve =
gets clogged the pressure will be uncontrolled.
=20
Dave=20
=20
=20
-----Original Message-----
From: Bud Rolofson <levilevi@comcast.net>
To: Triumphs <triumphs@autox.team.net>
Sent: Fri, Feb 25, 2022 1:15 pm
Subject: [TR] Fuel pump gone wild
Listerati,
What could happen to make my Spitfire mechanical fuel pump start pumping ex=
cessive fuel pressure? I tried two different vacuum gages inline to the fue=
l line between the pump and the carbs and they both showed over 10 psi (max=
ed the gage actually). That overwhelms the float needle valves and makes th=
e carbs flood making the engine barely idle and die if I try to increase th=
e rpm=E2=80=99s.
I guess I don=E2=80=99t know enough about how fuel pumps limit fuel pressur=
e internally. Is there something internal to the pump that could fail? Mayb=
e one of the round valves?
I also tried inline fuel pressure regulators (three different ones) but it =
didn=E2=80=99t seem to faze the high pressure. That was puzzling also.
Once it warms up a little I=E2=80=99ll try a spare pump.
Thanks
Bud
Sent from my Commodore 64 Sent from my Commodore 64
** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archiv=
e
sey@cs.com
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<div style=3D"color:black;font: 12pt Arial, Helvetica, sans-serif;">
<div> <font size=3D"3">Dunno. What model fuel pump is it? Is it=
one of those pulsing models? Those I think just use the spring to de=
termine the pressure. The only thing that could cause those to over p=
ressure would be a piece of debris caught in the spring.</font></div>
<div><br>
</div>
<div><font size=3D"3">A rotary style most likely has a pressure relief valv=
e. If the valve gets clogged the pressure will be uncontrolled.</font=
><br>
</div>
<div> <br>
</div>
<div style=3D"clear:both"><font size=3D"4">Dave </font><br>
<br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black"><font=
size=3D"2">-----Original Message-----<br>
From: Bud Rolofson <levilevi@comcast.net><br>
To: Triumphs <triumphs@autox.team.net><br>
Sent: Fri, Feb 25, 2022 1:15 pm<br>
Subject: [TR] Fuel pump gone wild<br>
<br>
<div dir=3D"ltr"><br>
</div>
<div dir=3D"ltr">Listerati,<br>
</div>
<div dir=3D"ltr"><br>
</div>
<div dir=3D"ltr">What could happen to make my Spitfire mechanical fuel pump=
start pumping excessive fuel pressure? I tried two different vacuum gages =
inline to the fuel line between the pump and the carbs and they both showed=
over 10 psi (maxed the gage actually). That overwhelms the float needle va=
lves and makes the carbs flood making the engine barely idle and die if I t=
ry to increase the rpm=E2=80=99s.<br>
</div>
<div dir=3D"ltr"><br>
</div>
<div dir=3D"ltr">I guess I don=E2=80=99t know enough about how fuel pumps l=
imit fuel pressure internally. Is there something internal to the pump that=
could fail? Maybe one of the round valves?<br>
</div>
<div dir=3D"ltr"><br>
</div>
<div dir=3D"ltr">I also tried inline fuel pressure regulators (three differ=
ent ones) but it didn=E2=80=99t seem to faze the high pressure. That was pu=
zzling also.<br>
</div>
<div dir=3D"ltr"><br>
</div>
<div dir=3D"ltr">Once it warms up a little I=E2=80=99ll try a spare pump.<b=
r>
</div>
<div dir=3D"ltr"><br>
</div>
<div dir=3D"ltr">Thanks<br>
</div>
<div dir=3D"ltr">Bud<br>
</div>
<div dir=3D"ltr"><br>
</div>
<div dir=3D"ltr"><br>
</div>
<div dir=3D"ltr">Sent from my Commodore 64 Sent from my Commodore 64<br>
</div>
<div dir=3D"ltr">** <a ymailto=3D"mailto:triumphs@autox.team.net"; href=3D"m=
ailto:triumphs@autox.team.net">triumphs@autox.team.net</a> **<br>
</div>
<div dir=3D"ltr"><br>
</div>
<div dir=3D"ltr">Donate: <a href=3D"http://www.team.net/donate.html"; target=
=3D"_blank">http://www.team.net/donate.html</a><br>
</div>
<div dir=3D"ltr">Archive: <a href=3D"http://www.team.net/pipermail/triumphs=
" target=3D"_blank">http://www.team.net/pipermail/triumphs </a> <a href=3D"=
/a><br>
</div>
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</div>
<div dir=3D"ltr">Unsubscribe/Manage: <a href=3D"http://autox.team.net/mailm=
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</div>
</font></div>
</div>
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