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fuel pump

Featured Replies

took fuel pump off to check to see if it worked.broke all three mounting screws,damn,fuel pump works if you apply power directly,traced it back to fuse box,with the key on no power to the fuel pump fuse. does it get its power from the ing switch or does it go through the relay first or is there a oil pressure switch first. my car is an 88 wagon dl.

The ecm uses a signal from the CAS (distributor) to trigger the pumps relay. It wont pump unless the engine is spinning. These cars do not have a priming cycle. Without looking at a wiring diagram I cannot tell you for sure if the fuse gets its power from the ign relay or whatever. I do belive It fed from one of the fuseable links direct off the battery. Its not hard to check these. 

There should be 12v + at fuse 11 with key on.  That fuse supplies the power to the relay.  ECU grounds relay during cranking, which then powers the fuel pump.

 

If that fuse has power, then the problem is you aren't getting Distributor pulse.

 

Test fuel pump by connecting green "test" connectors and turning key on.  Fuel pump should cycle.

Good tip (gloyale) on the test connectors. Dont forget to test the relay.

  • Author

i will try that next where are those test connectors exactly

i will try that next where are those test connectors exactly

 

Enigine bay at the firewall driver side.

 

Near fuel filter and Wiper motor.

Green for Test

White for Read

Both for Clear

  • Author

got it i will try that out tomarrow. had to fix mothers car first.

  • Author

got the fuel pump working now it was a bad relay,i put a used one in there for now,all i need now is spark and the wiring for the ac heater fan someone cut up the wiring and tried to bypass the resistores.

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