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Re: [T3] 2 cars 2 problems

On 22 Nov 2001, at 23:31, Mark Healey wrote:

> On Thu, 22 Nov 2001 20:06:12 -0600, Jim Adney wrote:
> >On 22 Nov 2001, at 13:58, Mark Healey wrote:
> >
> >> Car 1 71 FI manual square.

> >If this happens only on a nearly empty tank, it is normal.
> No, It happens on a full tank as much as a nearly empty tank.
> I doubt it is crud in the tank either.  About 2 years ago (probably
> 3000 miles) I had to remove the tank to change the steering box and
> gas flowed out freely.

Is your fuel overflow hose intact? If not, you can pump a lot of water & mud in 
there during just one drive in the rain.

> If it was ignition wouldn't there be backfiring?

Not necessarily.

> I've considered puting an LED inline with the fuel pump wire to see if
> it is cutting out.  I don't know how long it will last but it might be
> long enough.  Anybody have any thought on this?

It's not the fuel pump. If the pump stops you won't know it for several 
seconds, then the engine will just get weak and finally die, all as the fuel 
pressure slowly goes down. You might put a pressure gauge on the fuel that 
you can see while you're driving just to verify that things are staying up where 
they're supposed to be while under load.

The best way to test the fuel pump power is with a voltmeter connected from 
the fuel pump relay output to ground. That should stay up at 12-14V all the 
time the engine is running. Those relays sometimes get resistive and the 
output voltage drops.

The suggestion that I really liked the best was to check the mounting screw 
for the main FI power relay under the back seat. The ground for this relay is 
under that same screw and if it rattles loose the FI will not fire when it 
doesn't have power. OTOH, if this happens you should hear the main power 
relay AND the fuel pump relay clattering. If they are silent, then this is not 
your problem either.

Jim Adney
Madison, WI 53711-3054

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