Question about 1998 Jeep Cherokee
How many fuel pump relay switches are there . There is no power going back to the fuel pump.
First you need to test your wires going back yo the fuel pump inorder to see if you have a bad wire or not.. does the fuel pump initilize upon turn ignition on . if yes then you need to chk possible spark issuie . if no initilize then test connector at the fuel pump and work your way back to the fuel relay swtch and if that tests out work your way back to ignition switch . ( s/b only 1 relay )
Posted on Jul 01, 2009
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Posted on Jan 02, 2017
check your trunk for an emergency shut off button for fuel pump its usually a black littile box on the side with a red reset button in it
Posted on Mar 27, 2009
The ignition module sends a "pip" signal to turn on the fuel pump and keep it running. If the signal is lost, or not present you get no pump. This is a safety in case of accident or other hazard in order to shut off the fuel so it wont keep pumping into a car with the key still on but engine disabled for some reason. Take the module to your local parts store and have it tested, for free to check.
Posted on Sep 30, 2009
SOURCE: 1984 DL in tank fuel pump.
The in-tank pump does run constantly. The outer pump is the one that is switched. I'd suggest that you rewire properly, as using a jumper will cause you more headaches.
Posted on Oct 30, 2009
Poor earth connection most likely causing hifgh resistance voltage drop.
Could also be a faulty pump. Run a separate power supply to it and recheck.
Posted on Mar 10, 2010
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· Fuel Pump secondary circuit shorted to power
· Fuel pump relay contacts always closed
· Open in fuel pump monitor (FPM) circuit between ECU and connection to POWER TO PUMP circuit
· Heated Exhaust Gas Oxygen (HEGO) sensor shorted to power
· faulty ECU
Engine Does Not Start:
· Open inertia switch or inertia switch circuit
· Open in or between ECU and fuel pump (This includes open in fuel pump brushes/windings)
· faulty ground connection at fuel pump
The easiest way to check this circuit is to go to the fuel pump relay. If the relay clicks when the key is turned to the "RUN" position, then the inertia switch circuit is ok.
The Pink/Black wire starts from the fuel pump relay and goes two directions. One side goes back to the fuel pump. The other side is the fuel pump monitor circuit and goes to pin #8 at the ECU. This wire should only be hot for a second or two when the ignition is turned to the RUN position.
The fuel pump relay receives power on the Black/yellow wire. It comes from a fusible link at the power distribution center. This wire should be hot at all times.
If all the above is working as designed, them you probably have a bad fuel pump.
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