V10 Excursion starting problem
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V10 Excursion starting problem
<hr style="color:#D1D1E1; background-color:#D1D1E1" size="1"> <hr style="color:#D1D1E1; background-color:#D1D1E1" size="1"> I've been having a problem with starting the truck for a while but it seems to be getting worse.Some times I can turn the key on to start it and it starts right up. Other times I have to turn the key on and off multiple times to get the fuel pump to come on then it starts.Some times it starts and runs rough and dies,but once it does start it runs fine no problem.It was doing it some last year and I changed the fuel filter but no difference.I don't know if it's the fuel pump,some kind of module or wiring.Any ideas.Parts are so extensive and pulling the tank is a drag so I'd like to figure it out and fix it once.Thanks,Doug
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Joined: Oct 2013
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From: arizona
Try testing the fuel pump relay for resistance.It might have burnt contacts,although they usually just fail completly.When closed it shouldnt have any resistance on an OHM meter.Then i would start chasing the wiring especially paying attention for a bad or loose ground wire.Check your supply voltage at the fuel pump elect. connector approx 10.5 volts would indicate good wiring to this point as long as the ground wire for the pump is good it is getting proper voltage. If the fuel pump itself were going bad a check of the fuel pressure at the fuel rail would indicate this 30-45psi is normal.Start by testing the fuel pressure then the supply voltage then the relay.But the very first thingy I would do is hook up a scan tool and check for codes.
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