Question about Cars & Trucks
I have replaced the fuel pump, checked all fuses and fuel pump relay. i have tested the fuel pump reset. At the pump itself it only reads 3 volts when the key is on. the pump will not run. any ideas as to what else i can do?
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Posted on Jan 02, 2017
Your ECU is what acctivates your fuel pump realy. Put the key on the run possition and pull the ecu fuse for a few seconds and reinstall it ans it should accivate your realy for 5 seconds, Good luck.
Posted on Apr 06, 2009
SOURCE: 2000 S10 4.3L
At the fuel pump relay you should have 1 full time hot wire. 1 hot wire when you turn on the switch. 1 ground, and the other wire goes to the pump. Test the ground to be sure it is good. If so then jump a hot to the one that goes to the pump and see if it runs.If it does then you have a bad relay or ECM. You can swap the relay with another of the same # from tour fuse box to test it.There is also a ground on top of the frame near the filler neck, check it too. Good Luck
Posted on May 06, 2009
Check the voltage with someone cranking the engine. The fuel pump relay is incorperated in the FI relay located under right center of dash. It is a metal relay usually bolted to the floor near the ecm. Double check all the fuses inside and out
Posted on May 07, 2009
could be a bad earth or [ground]
the power wire ma be brocken or have a loose or dirty connection
you neeed to trace it along its lenght to determine the fault!
so start at the pump & work back
Posted on Jul 20, 2009
I can't speak for the electronics in your Chevy Sub. however I had experienced this same problem on my Montero and on my son's Dodge Stealth (it too is a Mitsubishi) in both cases I had spark but no injector pulse. In the end both ended up being the engine ECU units, once changed they ran and are running fine. Any chance you know someone with the same truck? If so confirm the part number and swap in their ECU unit. If your car then runs you know the answer. Good luck!
Posted on Aug 16, 2009
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