| [ Total Views: 683 | Total Replies: 9 | Thread Id: 87301 ] |
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 cesiumfrog
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| posted on November 24th, 2010 at 09:53 AM |
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fuel pressure gauge ?
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
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Sides
A.k.a.: Dave Sidery
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| posted on November 24th, 2010 at 10:22 AM |
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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...
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68AutoBug
A.k.a.: Lee Noonan
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 posted on November 24th, 2010 at 05:45 PM |
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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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- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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cesiumfrog
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| posted on November 24th, 2010 at 09:59 PM |
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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.
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 barls
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| posted on November 24th, 2010 at 10:02 PM |
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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.
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cesiumfrog
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| posted on November 24th, 2010 at 10:07 PM |
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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
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barls
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| posted on November 24th, 2010 at 10:09 PM |
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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.
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68AutoBug
A.k.a.: Lee Noonan
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 posted on November 24th, 2010 at 11:44 PM |
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| Quote: | Originally
posted by barls
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.
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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
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Sides
A.k.a.: Dave Sidery
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| posted on November 25th, 2010 at 10:35 AM |
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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.
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Join a car club - get car peeps
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'60 KG Coupe - resto kinda started
01 New Beetle - gf's car, but I turn the spanners |
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cesiumfrog
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| posted on November 25th, 2010 at 12:28 PM |
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thanks sides
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