Adjusting pressure for stock fuel pump

vaman

I have a stock fuel pump and I need to reduce the fuel pressure to a value of 2psi. I have read that I can do this by adding gaskets under the intermediate flange. Has anyone done this? How many gaskets does it take?

Mongo63 · Posted: Thu Dec 13, 2007 8:24 pm Post subject:

As many as it takes to achieve your target fuel pressure. It's a try it and see kind of thing.

Glenn · Posted: Thu Dec 13, 2007 8:25 pm Post subject:

I've made a spacer out of thin aluminum and used a gasket on both sides.

What carbs use only 2psi?
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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MURZI · Posted: Thu Dec 13, 2007 8:38 pm Post subject:

Kadrons
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Glenn · Posted: Thu Dec 13, 2007 8:39 pm Post subject:

Kads need 2.5-3psi.
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74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"

Member #1009

#BlueSquare

vaman · Posted: Thu Dec 13, 2007 8:47 pm Post subject:

Solex 35 PDSITs need 2psi, or so I'm told.

MURZI · Posted: Thu Dec 13, 2007 8:49 pm Post subject:

1.5 to 2 psi on Kadrons has always worked for me.
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62 vert
2276
Tim’s welded heads
45 Dells
A1 sidewinder
Fk44 cam

andk5591 · Posted: Fri Dec 14, 2007 6:26 am Post subject:

Just did this yesterday - Got some thicker gasket material (1/16") at Pep boys and cut my own gasket. Dropped the pressure 0.5 lbs. Almost not worth the effort. A couple years ago, on the buggy, I just cut the rod with a hacksway (pump end) and then cleaned it up in a drill press. Worked fine.
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skills@eurocarsplus · Posted: Sun Jun 02, 2013 2:52 pm Post subject:

dug this one up from the pit of old threads.

i have a bocar alt style pump. started out at about 7 psi Shocked

i need to drop it to about 3 for my dellorto's

i took the spring out of the pump and put in a good OE spring from a german pump. i am now at about 5 psi.

i already ground the pushrod down about .020 and double stacked some gaskets (thick, made by gasket material i have)

i am now at about 4.75 psi. i don't really want to grind the rod more (thinking ahead if i have to replace this pump)

short of glenns idea of a spacer, (or a fpr) is there any other way to drop the pressure some?

my 'real' issue is the stock pump with the way the outlet is rubs my distributor, and that ain't gonna fly. the bocar has both in and out clocked in a favorable position (about 10:00) this clears everything and goes to my hard lines just fine.

i can post some pictures if anyone needs a visual aide
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Clyde Maddox · Posted: Sun Jun 02, 2013 4:38 pm Post subject:

It stinks, but all the Bocar pumps are putting out like 7 psi nowadays. I've been using an inline gage to read pressure, while shortening the pushrod like .050 at a time in a lathe. It's way cheaper to wreck a rod than stack 30-50 gaskets Rolling Eyes

skills@eurocarsplus · Posted: Sun Jun 02, 2013 5:15 pm Post subject:

so, it's not just me? here is what i have done:

made a plate out of 1/16th inch steel. that dropped it some, but then i noticed that the pump lever hangs down past the pump body about 1/8th inch or so Mad

so, i made another plate, hollowed out the center to resemble the case to fuel pump stand gasket. now i have 4.5psi, which would have been where a new pump should be.

i am at the point now where i am afraid to shorten the rod. i think by the time i get it where it needs to be, there would be too much of a gap/freeplay and i am thinking it may cause a ticking noise

thoughts?
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74 Thing · Samba Member Joined: September 02, 2004 Posts: 7393

Thank stinks!

The Bocar gave me close to the right PSI whereas the Brosal where way off like 7psi + and I needed to cut the rod or stack up the gaskets.

Sorry to hear you are having a problemm with the Brosal pumps.

Are you sure your flange is a true VW one. Lots of aftermarket flanges are not as thick as the VW ones.

esde · Posted: Sun Jun 02, 2013 8:03 pm Post subject:

Why not just run a low pressure regulator? For the time you've spent farting around with gaskets you could have it installed and be done sitting in the shade.

skills@eurocarsplus · Posted: Mon Jun 03, 2013 3:45 am Post subject:

well, alot of my reason for not wanting a regulator is:

1) it's bullshit. i shouldn't need to buy a regulator for a 'stock' replacement pump

2) i really don't want to add anything to a already 'complex' fuel system.

it's not about being a cheap vw owner either. i would pay 200.00 for a pump IF it worked correctly. i am getting so sick and motherf*cking tired of having to modify/rework every stupid part for these cars

sometimes i question why i deal with aircooled's

that said, how short have you guys made the rod without noise issues?
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andk5591 · Posted: Mon Jun 03, 2013 12:56 pm Post subject:

I have cut pushrods more than once - not a big deal and they are cheap and easy to find if you need a replacement. Thinking on one that I took close to 0.100" off.

Not sure how you did yours, but I have just used a hacksaw, then chucked it in a drill press to level it out and smooth it off with a mill file and then sandpaper.

In general, if I order a pump, I get a pushrod at the same time so I have a pretty good chance of them being correct.
_________________
D-Dubya Manx clone - 63 Short pan,1914.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Cindy's daily driver.
Max - 73 standard Beetle hearse project - For sale
66 bug project - Real patina & Suby conversion
There's more, but not keeping them...

chrisflstf · Posted: Mon Jun 03, 2013 1:25 pm Post subject:

The pump push rods are supposed to have hardened tips on them. Guess they wont have them if you shorten them

Kaygee · Samba Member Joined: May 30, 2007 Posts: 138 Location: WNC

I've gone the stacked gasket and cut rod route in an effort to get pressure down to 2 lbs. or a little less only to have the rod clattering.

A Holley regulator for 1-4 lbs. made my Kads the happiest they've ever been and mounted on the firewall just above the shroud the dual outlet made for a tidy way of plumbing things.
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skills@eurocarsplus · Posted: Mon Jun 03, 2013 2:11 pm Post subject:

andk5591 · Posted: Mon Jun 03, 2013 4:51 pm Post subject:

Franz · Posted: Tue Aug 04, 2015 5:32 am Post subject:

I'm having a similar issue with the fuel pressure being too high. I've cut the rod down and spaced the pump to get the pressure down to 3psi at idle .....but now it does not have the fuel volume needed and runs out of fuel under load.

Is there another way to adjust the fuel pressure in the pump? Spring tension?

It's a 40hp fuel pump that can be taken apart.

I do not want the clutter my engine bay with an external regulator.

Maybe Its time to try a different pump?


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