If one of my fuel pumps is going....?

[jdbubb at verizon.net (Dan Bubb)]

You don't need to have a pressure gauge to test the pump.
You disconnect that RETURN line from the CIS and check flow per the bentley.
Measuring flow out the return line is a better test in that it checks the 
pumps flow against the fuel pressure regulator.
Dan

From: "Allyn" <amalventano1@tds.net>
Sent: Sunday, October 08, 2006 6:23 PM
Subject: RE: If one of my fuel pumps is going....?


>> If one of my pumps is going how is the car typically going to act?
>
> Main pump - wont run
> Transfer pump - will run, but over time will draw enough air into the 
> reservoir that you will get fuel cut until the car is off for
> a few minutes and fuel can (might) gravity fill the reservoir back up for 
> another round of driving.  The air that collects at the
> reservoir normally cycles back to the tank, but this does not happen when 
> the transfer pump is running, as it displaces that air
> back to the tank.  With the transfer pump off, fuel is drawn to the 
> reservoir (mainly) via the return line.  This failure mode
> assumes the return line hose (on the in-tank assembly) has not 
> disintegrated.  If it has disintegrated, you will get a constant
> stream of aerated fuel to the main pump, which will get further aerated by 
> the pump cavitation and sent forward as a bubbly mess.
> Now that I think about it, it may cause the symptoms you just described.
>
> I would disconnect the main fuel line at the filter under the hood and 
> direct it to a fuel-safe bucket.  Ensure you get a clean
> stream when cycling the ignition (and do so carefully).
>
> HTH
> Al
>
>
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