No power to fuel pump
07-01-2015, 03:40 PM
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No power to fuel pump
Sorry for the long read ahead of time. But heres what I'm dealing with.
1995 3.0 4runner
On my way to work yesterday truck lost engine power. Would crank over but wasn't getting fuel. Fuel pump wasn't coming on. Dropped tank at work, tested pump and it's not bad. Checked the wires to the pump and no power. I jumped the B+ and FP in the diag and got power. Replaced AFM, and ECM from a parts truck I got. Still nothing. Ill be replacing the harness next but was hoping you guys may have some incite. Ran fine before my battery got cut and battery acid leaked out. Had a miss, replaced plugs and wires, ran fine. Now this.
1995 3.0 4runner
On my way to work yesterday truck lost engine power. Would crank over but wasn't getting fuel. Fuel pump wasn't coming on. Dropped tank at work, tested pump and it's not bad. Checked the wires to the pump and no power. I jumped the B+ and FP in the diag and got power. Replaced AFM, and ECM from a parts truck I got. Still nothing. Ill be replacing the harness next but was hoping you guys may have some incite. Ran fine before my battery got cut and battery acid leaked out. Had a miss, replaced plugs and wires, ran fine. Now this.
Last edited by OffroadRalph; 07-01-2015 at 03:44 PM.
07-01-2015, 04:38 PM
#2
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Sounds like the Circuit Opening Relay...
http://personal.utulsa.edu/~nathan-b...96circuito.pdf
http://personal.utulsa.edu/~nathan-b...96circuito.pdf
07-01-2015, 04:45 PM
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I took out a relay from the relay box in front of the fuse box. Was the smaller box far left relay. And used it to test in the EFI relay port. Didn't change anything. Unless I'm missing something?
07-01-2015, 04:48 PM
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Just took a better look at the diagram. I think I kinda see what you're saying. Trucks at work. I'm going to go out and look for it on the parts truck. Hopefully tomorrow I'll have it figured out.
Last edited by OffroadRalph; 07-01-2015 at 04:56 PM.
07-01-2015, 05:21 PM
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Last edited by rustypigeon; 07-01-2015 at 05:23 PM.
07-01-2015, 05:29 PM
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Looked it up and located the relay and removed it. Ill find out tomorrow. I pray this works. Lucky to have two other 4runners to pick from. Can't thank you guys enough.
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07-02-2015, 06:51 AM
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Did you find WHAT was wrong with the COR (multimeter testing)? I doubt there is any reasonable repair, but it would be interesting to know what part failed.
07-02-2015, 07:28 PM
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Think I may have figured out why the relay failed. My windshield was replaced before I purchased the truck. Don't know when it was replaced but it wasn't sealed correctly. It tends to leak. Well water apparently got down in side of the dash and must have gotten into it. The connector was pretty corroded. Going to mess with it and see if it was just the connector but ran out of time. Won't test it till Sunday or Monday. Too busy with work and other things. Can't thank you guys enough.
Last edited by OffroadRalph; 07-02-2015 at 07:30 PM.
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