Fuel Pump Relay question

[Unka Bart]

Hi Chris, others,

> Ok... went back out and started playing with the Relay / Fuse box tray
> some more.  I'm almost certain the problem is in the wiring (which
> SUCKS) under the tray.  You know... EVERY SINGLE WIRE in the car runs
> through there.  Yeah... that's gonna be easy to diagnose.
>
> Almost every time I shook the tray as I had it unclipped from the
> mount, the engine would die.  Then, as the car was cranking and
> cranking, I'd shake the tray and VROOM.  I'd say 85% of the time,
> shaking the tray stalled the engine.

[snipped the rest]

This sounds very much like what plagued me with the Gentleman's 
Express.  It turned out to be the RPM sensor which has a loose 
connection/connector.  When the engine rocks, the wire from the 
connector to the sensor itself pulls on the connector and breaks 
contact.  The CPU reads this as "no RPM" and shuts down the fuel pump 
relay, in turn shutting down the fuel pump and killing the engine.  
Dave Head discovered this while bumping the wire from the connector to 
the sensor and then we dug out the wiring diagrams and verified that 
this was what was happening.  I don't know if you have an RPM sensor 
like the V8 does, but I'd have to believe that something with an 
intermittent lose connection is causing the CPU to get a "no RPM" 
message and signal the fuel pump relay to shut down the fuel pump.

Perhaps one of the wires in the tray that you are shaking leads to a 
failing sensor or one with a loose connector.  If you have an RPM 
sensor, I would suspect that to be your culprit.

yer kindly ol' Unka Bart