Pierberg

[ELFRIED]

I have the pierberg fuel pump with the square head.
I rebuilt ,put the preload to 14 mm and now the pump doesn t give any fuel.
When i blow in the inlet it is stuck ,no air coming out .
Is this normal?
When i put the pump on the jig with 14 mm preload I still can t get air flowing.
Perhaps the outlet valve is kaput?
Is there a way to test?
The inlet valve seems to open.
When I rebuit the pump she was rather clean inside .

thanks

[scarabee]

After rebuilding, you need to bleed it on the bench. Otherwise you'll have to do a lot of cranking. Press on the lever until the pump sucks in and pushes out fuel. If it doesn't do it, something went wrong in assembly.

[EverettB]

I don't know if you can blow in the inlet and have fuel come out, I think you have to pump it.

I usually work it with my finger and can hear it pumping.

As scarabee said, a couple times I had to manually pump fuel with it, then it started working immediately
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[ELFRIED]

i didn t change the outlet valve tough.
when i put it on the car and cranked afterwards when I opened it the pump was full of fuel so the inlet part must be ok.
However nothing coming out .
Strange.

[kreemoweet]

[Eric&Barb]

Fill the carb float chamber to get the engine running, that will give even a dry pump enough get up and go to suck up the fuel to it. Anyone can cut up a plastic fuel filter to make it into a fuel proof funnel that can then connect to the hose going into the carb to fill it.
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[ELFRIED]

still wrestling with that pump.

As I am almost sure the intake is ok and the pump sucks fuel, I hear the well know sound when pushing with my finger, I took the outlet valve out.

All there was is a round black thing and the round metal ring where it sits in.
Is that a valve??? No spring no nothing.
Could this be the problem?

[Eric&Barb]

[kreemoweet]

The outlet valve in that pump consists of:

1. An aluminum seat that's lightly pressed into the pump and held in place by staking of the metal (usually at 3 places) at the rim.

2. A round disk make of plastic/bakelite.

3. An extremely light coil spring that holds the disk against the seat.
Needless to say, the pump will not work without that little spring.

I don't know where you could find a replacement. Wolfburg West used to sell a pump rebuild kit with bogus diaphragm assemblies and bogus outlet valve components, none of which fit or worked in the stock VW/Pierburg pumps. WW now sells the correct diaphrams, and I've heard their latest kits have that good diaphragm, but I don't know whether they've improved the other parts in that kit.
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[ELFRIED]

ok ,thanks clear finally found the problem.

[wcfvw69]

[KTPhil]

[ELFRIED]

was missing the little spring in the oultet valve