fuel pressure gauge ?

cesiumfrog Seriously Crusin Dubber

161 posts · joined Apr 2005 · 24 Nov 2010, 9:53 am

#814098

hi fellas! can anyone help with a cupla questions about standard mechanical fuel pump ?

when setting / checking fuel pressure should the gauge be tee'd or is it ok to plug straight into the fuel line and run the engine off fuel bowl while taking the reading? i am getting about 7 psi this way.
any idea how much difference in fuel pressure one gasket is likely to make? need to reduce it to 3psi.
thanks in anticipation
phil

Sides Veteran Volks Folk

2,220 posts · joined May 2007 · 24 Nov 2010, 10:22 am

#814099

Well, plugging straight in like that isn't the best way of doing it, but it'll work.

Blocking the fuel pump outlet like that the pressure the gauge sees will be the same as what the float valve in the carb would have to overcome to shut off the fuel. Weber's & Dell's both don't like more than 3.5 - 4 psi (suspect you know this already tho hey)

I'd only be guessing how much difference one gasket would make... it depends on the clearances you have there currently.. but why not do iti properly and install a pressure regulator with a gauge on iti ??? That gives you complete adjustability...

👍

VWDCQ vice pres & web dude - vwdcqinc.org.au
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68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 24 Nov 2010, 5:45 pm

#814158

Hi

I have read where a Beetle fuel pump can pump at excessive pressures 7 psi is excessive... lol

I have a fuel pressure gauge screwed into My fuel pressure regulator...

I have it set around 2 psi...

I am using an electric fuel pump too....

I would guess You would need a few gaskets to get down to 3 psi...

maybe find a shorter fuel pump drive shaft/pin..

LEE

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cesiumfrog Seriously Crusin Dubber

161 posts · joined Apr 2005 · 24 Nov 2010, 9:59 pm

#814197

you're making me dizzy,Lee.
of course you guys are right...reg. and gauge is the best fix.
just for interest sake i have 6 gaskets under the pump and am getting about 5 psi with the gauge plugged into the fuel line (not tee'd in) so ~4 thin paper gaskets got me a couple of psi drop
in pressure
anyone like to recommend brand/type of regulators, fuel pumps?
thanks, phil.

barls Administrator Causer of Chaos and Mayhem

9,473 posts · joined Jun 2004 · 24 Nov 2010, 10:02 pm

#814198

not the one that is the steel body with the push down and turn dial. i went through 3 on my bug before saying bugger it.

“We all pay for life with death, so everything in between should be free.” Bill Hicks
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cesiumfrog Seriously Crusin Dubber

161 posts · joined Apr 2005 · 24 Nov 2010, 10:07 pm

#814202

oh...shame about that..i think have one of those the shed. thanks.

and sides....yeah, time to release some 40 dells from there cardboard wrapper

barls Administrator Causer of Chaos and Mayhem

9,473 posts · joined Jun 2004 · 24 Nov 2010, 10:09 pm

#814203

thats what i put on mine and why i fitted the reg to limit it to 3.5 psi. unfortunately they didnt last more than a month each.

“We all pay for life with death, so everything in between should be free.” Bill Hicks
the chaos project - click me

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 24 Nov 2010, 11:44 pm

#814212

barls wrote:not the one that is the steel body with the push down and turn dial. i went through 3 on my bug before saying bugger it.

Mine is a Holley with a screw adjuster....

I probably would have bought one with the turn dial if I had saw one Barls... lol

I think mine is an NOS from around 1976 > .. lol
from the date on the paperwork..
part number 12-804 Holley made in USA..

having a regulator saves having pressure on the needle & seat in the carburetor...

LEE

- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

Sides Veteran Volks Folk

2,220 posts · joined May 2007 · 25 Nov 2010, 10:35 am

#814241

Holley or Mallory would be my pick.... you want the "deadhead" style which doesn't use a return line.

Can usually pick either up on ebay for around the $60-$80 mark without too much hassle, and a decent 1 1/2" gauge to put into it prolly $40'ish.

Also make sure you get carb versions... the range you want is 0-15 psi.

VWDCQ vice pres & web dude - vwdcqinc.org.au
Join a car club - get car peeps

My toys
'70 Hillclimb Bug 'Jezebel' w/- Haltech EFI - http://bit.ly/VwTNtQ
'60 KG Coupe - resto kinda started
01 New Beetle - gf's car, but I turn the spanners

cesiumfrog Seriously Crusin Dubber

161 posts · joined Apr 2005 · 25 Nov 2010, 12:28 pm

#814258

thanks sides