Re: [TR] fuel pump pressure question

["Wbeech" <wbeech@flash.net>]

Probably it is more relative to the efficiency of your float shutoff valve.
SUs and most carburetors want between 2.5-3.5psi of pressure.  Could you get
away with 20% more at 4.2psi?  Maybe, but each step up just increases the
risk of failure/flooding.  Kind of like stepping out on a skinny limb to
find out when it will break.

If you have the measuring and regulating ability, give a try and tell us all
where the float valve starts to leak.

Bill

Bill Beecher
'58 TR3A TS/30766L "Tarbaby"
'62 TR3B TCF/2549L
www.triumphowners.com/1566
'68 Land Rover Series IIa 88" "The Beast"
"If youthink you have everything under control... You're driving too slow"
M.Andretti


-----Original Message-----
From: triumphs-bounces@autox.team.net
[mailto:triumphs-bounces@autox.team.net] On Behalf Of terryrs@comcast.net
Sent: Saturday, July 14, 2012 9:09 PM
To: triumphs@autox.team.net
Subject: [TR] fuel pump pressure question

Question: carburetors call for specific fuel psi's.  Does it take exceeding
it by a lot (say, 20%) to overwhelm the floats and cause flooding?  ...Or a
little, say 5%?

Probably it's relative to the size of the carb.  I dunno.  Just trying to
get a general idea.

Terry

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