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I have repalced my fuel pump in truck. it was working fine for three days and now its not working at all. i replaced the relay. my question is. is there a fuse for the fuel system?
Re: I have repalced my fuel pump in truck. it was working...
Yes there is a fuse for the fuel pump,you don`t say what type/year of truck your talking about so check all the fuses inside the truck and under the hood if there is any under the hood.
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I would buy a fuel pump relay for that particular car. If that relay that you switched with the wiper relay isn't the same exact one then the fuel pump will not work properly. Make sure the right relay is in there. Could also be a clogged fuel filter.
it is not uncommon for a replacement pump to be bad. I repalced a pump in my daughter's car three times before getting one that worked properly. You may have a bad one and need to return it .
Check for 12 volts power at the fuel pump harness. If no power is going to the pump, check the fuel pump relay. Also, check the fuel pump inertia switch. Ford usually has it on either inside left or right rear trunk fenders.
There are three relays all grouped together on the firewall on the passengers side. All three are related to your situated. We can eliminate one of them because you stated that the fuel pump is operating fine. Now that leaves the relay for the ECM(engine control module) this tells the injectors, cold start and run, when and how much fuel to supply and also controls ignition timing and spark advance. The third controls the AC compressor. Now I've got to remind you that I started working on fuel injection systems the day they started failing here in the US around 1972.These were such vehicles as Mercedes, Saab and Volvo. I've worked on every configuration, TBI, MPI, diesel etc.etc. I may on occasion cross one fact with another or mispronounce certain aspect of a system however, These three injectors are where you want to concentrate your efforts. With some finnesse you can swap the harnesses from one to another. If your car runs fine and your AC suddenly does not, then you know that that relay is faulty. Do this until you get your answer. Best of luck my friend, Dana
Check the crank position sensor. I had the same problem in a 1989 cherokee 4.0, and the solution was simply to acomodate the sensor wiring. No replace was necesary
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