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Won't start: relais OK but no power to fuel pump relay (940SE) 900

posted by  thePopeMobile on  Thu Apr 16 02:10 CST 2009
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last visit: Sun Apr 19 10:49 CST 2009
[RELATED]

Dear friends,
my trusty 940SE left me on the highway...
I cannot hear the 2 sec. hissing of the fuel pump when turning the key.

Back at garage I checked the usual stuff:

- removed one spark plug and crancked: OK SPARK
- checked the radio suppression relay: OK
- checked the fuel pump relay: PROBLEM

I have the green relay (Volvo 13622914) mounted on the passenger feet comp. (remember that the 940SE is basically a 960 with a 4 cyl.)

THE RELAY TEST OK, inside the green plastic there are 2 relais, both are operating ok. But just in case I tried to SWAP with a NEW RELAY but it did not solve the problem.

I installed the relay without the plastic cover and operated the relay "manually" with the finger: I could immediately hear the fuel pump noise and the CAR STARTED IMMEDIATELY!!!

So I tested the socket and to my big surprise no power to 85 and 86/2 that should energize the coil of the fuel pump. No negative and no positive...

I do not have the electrical scheme to follow and I have no a clue of where to look for this.

Any help is greatly appreciated.

Sincerely,
Dave





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