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Re: fuel pump not working
The pump only runs for 2-10 seconds with the key on and then shuts off if the vehicle doesn't start or isn't tried to start. Are you checking it within this period? The power you are picking up at the sender is for the guage. You also have a relay that controls the pump as well as the oil pressure sensor to make sure you have plenty of oil for the engine to run. Are you positive it is in the fuel system? Let me know.
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fuel gauge the tank sender is like a resister, no resistance to ground gauge goes up, i think you have a grounding fault in the earth wire, you will need to trace were the wire goes to or make a new feed, making a new earth feed can sometimes be better if you have a spare bulb and some wire to attach to it connect one wire to the live feed on the pump and then ground the earth wire on the shell if it lights up then its the ground that's at fault.
Some cars have a safety shut down fuel pump relay,Have you hit a big bump or had a fender bender? Oil pressure sender will stop the pump,is the fuel filter plugged,Have you cheked the fuse, is there power to the pump? Is the tank empty? Is there power to the injectors? Engine computer?
The plug you are referring to is probably the fuel tank pressure sender not the fuel pump. It would be plugged into a black sensor about 2 inches long pushed into a rubbergrommet on the fuel bung. The fuel pump connector would have more that 2 wires going to it. most likely a heavy purple wire would be the power to the pump. It has to have 12 volts to it to work. The sender may have 3 wires, 5 volts, ground, and sense. the pump connector would have 12 volts, ground and 5 volts for the fuel gauge sender down in the tank.
If the 12 volts is not there, check the fuel pump relay. it is usually up on the drivers side firewall.
With the key in the on position without starting the engine, you should have 12 volts to the pump for 3 seconds then it will click off. Without cranking the engine you should be able to locate the relay by the clicking sound.
There is also the obvious, like checking the fuel pump fuse.
The fuel pump relay won't energize if the ignition is bad, or the fuel safety cut out is bad. Don't know what Dodge uses. Ford has an inertial switch in trunk. Many cars use the alternator. Some use extra wires to the oil pressure sender. Try looking at the wiring diagram on relay side, and jumper the outputs where relay plugs into, bypassing the relay completely. The pump should hum and you should get pressure. If not, make sure the tank isn't buiding up vacuum, and make sure the power and gound are good at the pump.
Some times the wires in the tank burn up,Have you checked for a blown fuel pump fuse?It would be a good sigh of this.The fuel pump grounds off the tank,the sender,grounds threw the other side of the in-dash gauge.I would look for the whole fuel pump ,and fuel sender to have burned wires inside the tank.