89 Jeep Comanche Fuel Pump. Won't start after running great.
I have an 89 Jeep Comanche, 6 cyl. 5 speed. The mechanic said the fuel pump was going out because it was hesitating really bad when you stepped on the accelerator. I replaced the fuel pump and it ran great for one day. The next morning I went to start it and it just cranked and cranked but wouldn't start. I took the fuel pump out and replaced it again. (The old pump worked fine at the auto parts store when the manager hooked it up to a battery). Again, it started right up and ran great for a day. The next morning it wouldn't start. I am wondering if it is something electrical. Any ideas?
On mine the fuel pump power wire retainer (the plastic piece holding it to truck)broke. wire touched driveshaft fuel pump did what you were saying at first. then shorted the lead to fuel pump inside the fuel tank. pump didn't work at all after that.shorted to fuel pump mounting frame. has done it 3 times no fire yet .just freaks me out a wire melting inside the gas tank.(the lowest gauge wire in the circuit) what i'm saying is the power wire to the fuel pump could be damaged on what the fuel pump is mounted to(the wire outside the tank)
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what motor? is the coil producing spark?? If so, check the fuel pressure, if the fuel pressure is low drop the tank, repace the pump and also replace the filter (located on the frame forward of the tank). If the coil is not producing spark, check for shorts or opens in the circuits as well as the IGN fuses. If there is NO fuel pressure at all check the fuel pump fuses and make sure the fuel pump is plugged in and there are no opens in the circuit
Its a 91,,,,20 years of use on that fuel pump, If it is not getting gas than its the fuel pump, You could try replaceing the fuel filter,And have some one do a fuel pressure test,But its most likely the pump died and yes some will pump a little and than quit.How many miles on it? thats how many miles on that pump also.
sticky choke maybe, try carb cleaner, check the air-cleaner filter,depending on were you live, maybe some dry gas.from the symtom's sounds like it's chocking out,those are the easy cheap thing's first, now check the fuel filter, then the fue pump, prividing your getting good spark to fire up the fuel,good luck
check the solenoid on the starter it powers the ign for starting then switches to run when you let off key,either the solenoid is bad or a wire to the solenoid has come unhooked and sometime they have an in line fuse which can blow.
If the pump is running with the key on, and you have a hose coming from the pump with no obstructions in the way (such as a fuel filter) and there is no fuel coming out of that open hose, then you need to remove the pump and find out why. It cannot run without pumping something out of the hose (unless you have it connected to the wrong hose (vent or return line) Voltage is important, but if it's running even if volts are low, it still will move some fuel.