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RE: [T3] Won't Start Puzzler

On 5 Jan 2001, at 8:26, Fuhriman, Mark wrote:

> I have looked at *all* of these obvious suspects.  The trigger points
> are in immaculate shape.  And I don't think it is the fuel pump or the
> relay.  I listen carefully for the humming.  It's a little noisy, so
> it's easy to hear.

Hmm.... I wonder if this is some kind of clue. The only time I have 
ever been able to hear these while in the car with the engine 
running was when either the rubber supports were broken and the 
pump could rest directly on something metal what transmitted 
sound too well, or when the filter was clogged and the pump made 
extra noise because it was cavitating due to the input restriction.

The latter can cause problems under load when the pump is unable 
to deliver enough gas for the engine. It's nice to diagnose these by 
driving with a fuel pressure gauge attached and run to where you 
can watch it while you drive. A system that measured just fine in 
the driveway can run short of pressure once you get it out on the 
road. Still, I don't think this sounds like YOUR problem, but I 
wonder why it is that your pump is loud.

Jim Adney
Madison, WI 53711-3054

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