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Volkswagen Passat: 1990-1994 (B3) 91 Passat Low Fuel Pressure


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Last Post: Dec 19, 2017 10:10 PM Last Post By: aprilrussell
JoeBean

Posts: 4,697
Registered: 02/14/02
91 Passat Low Fuel Pressure
Posted: Apr 19, 2002 8:05 PM
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91 Passat Low Fuel Pressure William Thorne JoeBean fission@roadrunner.nf.net
Hi everyone,
I'm still having problems with fuel pressure. Here's what I've done so far:

After determining I wasn't getting any fuel to the injectors, I got a loan of a proper fuel pressure guage and ran the fuel pressure tests in section 6 of the Fuel System chapter. System pressure reached about 100-110 PSI while the fuel pump was running, but immediately dropped to about 40-50 PSI after it stopped running. I immediately assumed that the diaphragm pressure regulator was faulty since that's what it says in the book, and after doing a volume test on the fuel pump to make sure it was OK, I decided that I had to replace the regulator.

Before I ordered, just to be sure it wasn't the fuel pump check valve I checked to see if the pump would hold pressure if I connected the guages directly to the supply line. It held pressure fine. Then I reconnected the supply line and crimped the line leaving the fuel pressure regulator and returning to the tank to see if that would keep the pressure up, and it did! So I had a scrapyard send me one (bad mistake??) since they are rediculously overpriced. I got that one today but guess what? There's evidently STILL to little pressure since the injectors will only break if I pull up on the sensor plate while the fuel pump is running.
So what do you think? Another bad pressure regulator? Should I return it and buy a new unit? Or is there something I'm missing? I'm going to get the fuel guages again to completely re-test everything before I make any final decisions, but I can't see any other possibility...

Any comments/suggestions very, VERY appreciated as my frustration is mounting :)
Terry

Art

Posts: 2,743
Registered: 09/08/00
RE: 91 Passat Low Fuel Pressure
Posted: Apr 23, 2002 8:59 AM   in response to: JoeBean in response to: JoeBean
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RE: 91 Passat Low Fuel Pressure Guest User
Good Morning, William,

Still fighting this problem.......

I think that you are there in terms of fixing this. You wrote "There's
evidently STILL to little pressure since the injectors will only break if I
pull up on the sensor plate while the fuel pump is running." The injectors
are only supposed to spray when the sensor plate is lifted, so I think that
the sensor plate is out of adjustment in the cone and that the height in
relation to the fuel distributor piston is out of adjustment as well.
Another thought, the cold start valve is not leaking is it?

Art LeBrun

-----Original Message-----
From: passat-90-93 Listmanager
[mailto:listmanager@tech.bentleypublishers.com]
Sent: Friday, April 19, 2002 8:05 PM
Subject: 91 Passat Low Fuel Pressure

Hi everyone,
I'm still having problems with fuel pressure. Here's what I've done so far:

After determining I wasn't getting any fuel to the injectors, I got a loan
of a proper fuel pressure guage and ran the fuel pressure tests in section 6
of the Fuel System chapter. System pressure reached about 100-110 PSI while
the fuel pump was running, but immediately dropped to about 40-50 PSI after
it stopped running. I immediately assumed that the diaphragm pressure
regulator was faulty since that's what it says in the book, and after doing
a volume test on the fuel pump to make sure it was OK, I decided that I had
to replace the regulator.

Before I ordered, just to be sure it wasn't the fuel pump check valve I
checked to see if the pump would hold pressure if I connected the guages
directly to the supply line. It held pressure fine. Then I reconnected the
supply line and crimped the line leaving the fuel pressure regulator and
returning to the tank to see if that would keep the pressure up, and it did!
So I had a scrapyard send me one (bad mistake??) since they are rediculously
overpriced. I got that one today but guess what? There's evidently STILL
to little pressure since the injectors will only break if I pull up on the
sensor plate while the fuel pump is running.
So what do you think? Another bad pressure regulator? Should I return it
and buy a new unit? Or is there something I'm missing? I'm going to get
the fuel guages again to completely re-test everything before I make any
final decisions, but I can't see any other possibility...

Any comments/suggestions very, VERY appreciated as my frustration is
mounting :)
Terry

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play

Posts: 13
Registered: 12/04/17
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aprilrussell

Posts: 1
Registered: 12/19/17
Re: 91 Passat Low Fuel Pressure
Posted: Dec 19, 2017 10:10 PM   in response to: JoeBean in response to: JoeBean
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