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Yet another crank no start thread 200 1991

posted by  vadimk11 on  Sat May 23 18:36 CST 2020
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last visit: Mon Oct 24 22:04 CST 2011
[RELATED]

I am sure this was answered before, but I would like to double check that I am on the right track. 1991 240.

I have spark (verified with an inline spark tester), have fuel injector pulse (verified with a noid light). When I put a jumper between fuse 4 and fuse 6, I hear a hum. I think it is just the in-tank pump that I hear. When I touch the other pump and connect the jumper, I don't feel anything.

So, my question is, should I feel the pump vibrate, or hear it as I am under the car, when fuse 4 and fuse 6 are connected? And if so, it's down to two things, either the pump, or the pump wiring, correct?

I can't check the fuel pressure because I don't have a valve on the rail, and if I disconnect the rail it turns out I don't have a right fitting to connect my fuel pressure gauge.

Thank you in advance.






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