I have no fuel pressure no spark until a clicking sound comes from the fuse box under the hood which starts fuel pump running fuel pump makes same clicking noise pressure comes right up and i then have spark and jeep starts right up. this clicking should be 1 click not 15 or 20 why? i have switched relays their not the problem. i changed heat/fuel sensor on the intake manifold. i'm thinking crank sensor or computor . anyone know? anyone know where crank sensor is on cherokee? this problem also seems to be worse in the morning when jeep is cold.
The click you hear is the fuel pump relay. It gets its signal to energize from the PCM.If you have a faulty Crankshaft Position Sensor, the PCM will not work. Check for a bad fuel pump relay and also all of the other sensors: Camshaft Position Sensor, MAP Sensor, Idle air Control, Intake Air Sensor,etc.
Repeated clicking generally indicates that you do not have a solid ground. Check both body ground and engine ground for good clean connections. Poor grounding oftem makes a relay act more like a buzzer than a relay...eventually arcing will make connection but it's not the kind you want.
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No fuel pressure.Checked electrical in fuse box,okay.There;s a small 20 amp fuse and a relay which are okay.Pressed fuel pump reset in trunk,okay.Now what about the switch right where the fuel enters the fuel rail? Thanks for any help. don
Fuel pump hums when cranking for a couple of seconds like it should.
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