comanche-man22 Posted March 26, 2007 Share Posted March 26, 2007 i have been working on my truck for about a month now seeing that i have school and all during the day but i bought a new fuel pump for my truck and installed it and let me tell you it was a pain! but i got it and got all the hoses and wires hooked back up and went to turn it over and it won't start. so i started to eliminate problems and started at the fuel lines and the fuel filter just fine...so now i need some help on what to do next?? Link to comment Share on other sites More sharing options...
JeepcoMJ Posted March 26, 2007 Share Posted March 26, 2007 check the wires for power with a test light. if they have power, great, if not, that sucks. if they don't then you either have a bad relay, a bad connection (anywhere between the computer and fuel pump), or a bad computer. if they do then your pump might not be any good? Link to comment Share on other sites More sharing options...
comanche-man22 Posted March 26, 2007 Author Share Posted March 26, 2007 ok thanx for the info i am gunna check the wires and let ya know and one of the things that kinda worries me is that the fuel pump is brand new i just replaced it!! Link to comment Share on other sites More sharing options...
jackel18 Posted March 26, 2007 Share Posted March 26, 2007 mine did the same thing when we put the new tank/pump in. it ended up being a loose wire. Link to comment Share on other sites More sharing options...
comanche-man22 Posted March 26, 2007 Author Share Posted March 26, 2007 oh really? do you happen to know which wire it was? Link to comment Share on other sites More sharing options...
87manche Posted March 26, 2007 Share Posted March 26, 2007 likely a ground wire. Pull up the carpet in the back, behind the drivers seat, there's a plug right there, it's got the tail lights and the fuel pump wire. CHeck that it's got 12V on the orange wire there, if you don't, it's something forward of the cab, if you do, it's something under the truck. If you get a weird low voltage reading, check the fusilbe link, I had one freak out and it read 3V to the pump. If you've got 12V to the plug right at the pump, check the ground. if you've got ground and 12V at the pump, it's possible that the wire came off in the tank, which sucks BTW, and you'll be pulling the pump and hanger assembly again. Of course, it's possible that you just got a bum pump, which is why it's always a good idea to test a new pump in a bucket. Link to comment Share on other sites More sharing options...
comanche-man22 Posted March 26, 2007 Author Share Posted March 26, 2007 alright man thank you i will go test that wire and let ya know! Link to comment Share on other sites More sharing options...
mjeff87 Posted March 27, 2007 Share Posted March 27, 2007 wasn't there an issue with some aftermarket 4.0 pumps involving the terminal markings being reversed on the pump? Link to comment Share on other sites More sharing options...
comanche-man22 Posted March 28, 2007 Author Share Posted March 28, 2007 i have no idea but i will look into it and check that could be it tho i picked the new pump up from napa auto so who knows. Link to comment Share on other sites More sharing options...
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