Question about 1995 Ford Crown Victoria

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Fuel pump shorting out will not start

Have changed the sending unit, 3 pumps, checked grounds, relays, fuses, bypassed inertia switch, some of these things got the pump going then it stops this trouble started all at once has been a very good car drove the car 15 miles or so it just cut off cranked back once that was it any help out there I'm lost here

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2 Answers

Did you tape a fuel pressure gauge to the windshield,to see if your really loosing fuel, when it quits.
Did you consider the MAF sensor,TPS Sensor.
The pump won't run if it isn't needed. If the PCM doesn't see a crank signal or other data it needs,it won't keep the pump going.
You may be working on the symptom,not the cause.

Posted on May 13, 2010

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Check the inertia switch, usually on the passenger side inside the trunk. It's a safety cutoff switch that cuts power to the pump if the car gets hit in an accident, doesn't take much to trip it.

Posted on May 13, 2010

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2003 escape 2.0l no start. Will run with starter fluid. No power at fuel pump.


There are two relays you need to check out, also, check the fuses. Fords also, usually, have an inertia switch you can check. Your owners manual should give you the location.

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Two of those wires are for the sending unit for the fuel gauge .The pink with black stripe is B+ to fuel pump , black is ground for fuel pump other two are for fuel sending unit . There is all so a relay in the under hood fuse box for fuel pump an fuel shut off inertia switch . Before messing with fuel pump wiring check if inertia switch is tripped , Check out this videos on fuel pump circuits . Fuel Pump Electrical Circuits Description and Operation

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Have you checked your fuel shut off valve. It is behind the taillight on the passenger side, open the door where the jack is and look toward the back of the taillight. Should be a black box with a red button on top, if its tripped then all you have to do is push it down you will hear it click and the button will stay down. I try to locate you a wiring diagram. Good luck

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Inertia switch keeps cutting off while cranking engine


Power goes from the fuse box to the fuel pump relay to the inertia switch and then to the fuel pump motor.I would suggest bypassing the inertia switch for now just to see if you can get the vehicle started and go from there. FYI The inertia switch is just there in case you get in a collision and shuts fuel off. Good Luck

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New fuel pump, ccrm and fuel filter and still blowing 20 amp fuel pump fuse


If the components are all good, then check wiring connectors and wiring circuits, it appears the problem is after the ccrm. wiring from ccrm to fuel pump. For testing you should be able to use jumper wire with inline 20 amp fuse, from voltage to fuel pump connector, to see if it will run w/o blowing the fuse. As you can see from ccrm to inertia switch there are two connectors. From inertia switch to fuel pump, one connector. There are many ways to test. With connectors unplugged, you could use a test lite connected to battery voltage, touch correct wire terminal, if lite comes on, that circuit is going to ground, somewhere.
See that one wire that goes down, wire circuit from ccrm to inertia switch, that wire goes to pcm, I believe it to a monitor circuit, the pcm monitors the voltage on that circuit.
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1988Ford F150 Econoline Van5.0fuel system problems


Not sure I am following your story, but here goes.
The fuel pump relay gets power from a fuseable link at the starter solenoid and from the EEC relay. When the fuel pump is grounded by the computer it sends power to the inertia switch then to the pumps and controls.
If you are not getting main power to the relay the fuseable link (yellow wire) is fried. If the pump relay is not engaging, the EEC relay could be toast (red wire). If you are getting power out of the relay but not to the pumps, the inertia switch may be tripped.

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I look at the relay as two different circuits, the load side of relay is that line with arrowhead, when relay is energized that line moves to other terminal, you can see voltage to load side of relay comes from fusible link. That circuit goes through inertia switch, then to the pump. Then you have the control side of relay, left side in the diagram, that side has to have voltage and ground, voltage comes from eec power relay and that circuit is grounded by the pcm.
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1 Answer

Starter motor went out on 92 5.0 ho replaced it and new battery, now fuel pump does not work I get a 542 code checked fuel pump relay and inertia switch both good fuse good


  • Code 542 indicates one of the following conditions:

Engine Starts:

· 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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3 Answers

Fuel pump not getting power


Best to check everything, but I am guessing Fuel pump driver module.

Start with the fuse for the fuel pump, then the fuel inertia switch in the passenger side. The fuel pump relay is built into the fuse panel, and is not serviceable ( cannot pull and bench test ).

If the button is down on the fuel inertia switch, next lower the rear spare tire and check the fuel pump driver module on the cross member. Some times this gets corrosion built up behind it, and the corrosion pushed on the module, cracking it in half.
3bad7a9.jpg

If this is cracked, Ford dealers that sell parts online get ~ 70.00 + ship for it.
The part number I have for the version that looks to have modified the stand off posts higher is 4l3z-9d370-a , check for a newer revision prior to ordering. This is the version I got for mine, to have just in case.

Hope this helps, let us know if it does not.

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