JEEP RUNNING FINE YESTERDAY TODAY WENT TO START IT TO GO AND WOULD NOT START .. NORMALLY I CAN HEAR THE FUEL PUMP BUZZ BEFOR STARTING BUT NOT THIS TIME ALSO SOME OTHER WEIRD THINGS THE DASH LITE THAT SHOWS NO KEY SYMBOL IS BLINKING AND EVEN THOUGH I HAYE ALMOST A FULL TANK THE GAS GUAGE IS SHOWING EMPTY AND THE MILES TO EMPTY IS ALSO SHOWING EMPTY ....COMPUTER PROBLEM?
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do you have a spark at the plugs ? if so ..main cause is fuel pump connector plug under car by fuel tank . test this bye getting a Friend to turn ignition on but not start whilst you listen under car for fuel pump buzz. if you hear a buzz forget solution 1 if no sound try solution 1. move the plug (4wires in front of fuel tank ) about then try again . if you have a tester and power is passing this point (pump side) then it fuel pump faulty.. solution 2 crank sensor which is on the lower half of the engine block .. hope this helps
sounds like a bad fuel pump. open the gas cap and listen when you turn the key to the on position, not all the way to engage the starter, you should hear a buzzing for 5 or so secands that is the fuel pump in your gas tank. if you dont hear that buzzing the intank fuel pump is probley not working.
If you have disconnected the fuel filter (inlet) side and turned on the ignition, if fuel is not coming out of this line, then there is a fuel pump problem. This is assuming that you can hear the fuel pump actually running. Usually when the fuel pump runs and you can hear it, then there can be a screen on the pump plugged or the pump its self is not working. Hope this helps.
It's quite possible to ruin a fuel pump by letting it run dry, especially if it already has years of use. When you first turn on the key, leave the door open and see if you can hear a high pitched whine for about three seconds. That would be the pump priming the system. If you don't hear it, then the pump isn't working. Be sure to turn the key of for about 10 seconds before you try listenng again(it has to reset). It can be hard to hear, especially over the key buzzer.
Alarms usually won't allow the engine to crank. If it is the alarm, arming then disarming it usually gets them to start. However, you probably aren't that lucky. Probably the most common problem for Cherokees with ignition issues is a crank sensor or a fuel pump. Listen to hear if the fuel pump runs when you turn the key to the run position (it will only run for 2 seconds, so have someone else turn the key while you listen at the gas filler neck)
Disconnect and replace fuel filter.With filter disconnected have someone momentarily turn key to on position to see is fuel pump is working.Make sure you have lots of rags,a drain pan and safety goggles on
Same thing happened to me at about 140k. It was the fuel pump. Best way to test if your pump is failing and loosing pressure is to see if the car will start immediately after it has been running, or turn the key to the alt position for a few minutes before starting. If your engine fires faster after it has been running or the key has been in the alt position you will probably need a new fuel pump. Great news is with a very deep socket to get the tank straps off its a 30 minute job to replace the pump/filter assembly.