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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / June 2006

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Cavalier - measuring fuel pressure

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George - 14 Jun 2006 15:27 GMT
('99 Cavalier 2.2, port-injected.)

This particular car doesn't appear to have a tap on the fuel rail where
a pressure gauge could be attached.  The Chevy book calls for a J29658,
which lets you insert a tapped line at the quick-disconnect.  This may
be a whole 'pressure kit', or something - Kent-Moore said that their
price for it is $336.

All that I need is something that can go in-line where the
quick-disconnect connects to the rail.  So far, I haven't found anything
to do that.  Any ideas would be appreciated.

Alternatively, I measured the following ...
- pump pressure with the line plugged  : ~65 psi
- pump flow with the fuel line open    : ~45 gph
- discharge from the pressure regulator: ~15 gph
 (engine off, pump running.)

This last leads me to believe that the pump and regulator are probably
OK: if there's any discharge from the regulator, the pump must be
achieving the regulator pressure.  Any opinions appreciated.

(Car woke up dead one morning - cranks, but won't start.)

Thanks,
George
Shep - 14 Jun 2006 16:35 GMT
Got spark, got injector pulse, will it start with starting fluid, basic
diagnostics.
> ('99 Cavalier 2.2, port-injected.)
>
[quoted text clipped - 22 lines]
> Thanks,
> George
George - 16 Jun 2006 02:36 GMT
>Got spark, got injector pulse, will it start with starting fluid, basic
>diagnostics.

Well, I thought the injectors were OK, because it does catch sometimes.
But, looking at the drive with a scope, it looks like the pulses stop -
they're there, and then they're not.  Is this possible?

George

>> ('99 Cavalier 2.2, port-injected.)
>>
[quoted text clipped - 26 lines]
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