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Re: [T3] pressure regulator


On 1 Jun 99, at 10:30, Aaron Kunkle wrote:

> I have a '72 FI squareback that refuses to start.  I had the fuel pump
> re-built a couple of weeks ago and that got it running for about a week
> but then one day it wouldnt start again.  it's getting planty of flow
> from the gas tank but there's a strange noise coming from the pressure
> regulator. It's a low pitched squeek or maybe kind of a moan. It happens
> when the ignition is turned on and the pump runs for a second and also
> when I'm cranking the engine. 

This groaning is rather common, and, yes, it is from the pressure 
regulator. I'm not sure what causes it, but I think it is due to air 
bubbles blowing thorugh the PR. I find that it only happens when 
first starting up after a hot shutoff followed by a full cooling 
down.

I think that air commonly gets into the system during that cooldown 
and this has to be driven ou� the PR will shut up.

Try shorting between the two output terminals on the fuel pump relay 
under the dash. This will run the pump and without running anything 
else. A minute of this should clear all the air out and then perhaps 
the car will start.

Jim
-
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
*******************************

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