Question about 1988 Ford F 150

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I keep loosing power to the tanks and cant figure out why the inertia switch isnt triped , i have repaced the fuel pump relay and the eec relay and the pumps in the tanks, they seem to kick in when i first turn the key but i dont think they do after i get it running.

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You should check the pressure in the fuel lines going to your carb. or fuel injector and if pressure is good that would mean the relays are still doing there job

Posted on Apr 21, 2009

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My 2000 lincoln ls wont start. It had a few rough starts and now won't start at all. No sound from fuel pump I checked relay, fuses, inertia switch and replaced the pumps. Still nothing.


It has a fuel pump control module that modulates the signal to the fuel pump ensure it is getting the proper powers and grounds as a rule of thumb we replace both in our shops when we do a fuel pump because both parts have a high falure rate with high milage. Check the inertia switch to ensure it has no been triped they are usually located in the trunk area but have been known to be on the pass side kick panel if triped it will not send power to fuel pump

Mar 19, 2017 | Lincoln LS Cars & Trucks

1 Answer

1989 f-250 inertia fuel shut-off switch switch location


This should be in the owner's manual. I found the below on autozone.com, their repair help location:
An inertia switch is used as a safety device in the fuel system. The inertia switch is located in the cab, generally under the dashboard on the right side. It is designed to open the fuel pump power circuit in the event of a collision. The switch is reset by pushing each of 2 buttons on the switch simultaneously (some models use switches with only one reset button). The inertia switch should not be reset until the fuel system has been inspected for damage or leaks.
When the ignition switch is ON , it turns the EEC power relay ON . The EEC power relay provides power to the powertrain control module (PCM) and the control side of the fuel pump relay. Power for the fuel pump(s) is supplied through a fuse link or high current fuse attached to the starter solenoid (battery side). From the fuse link or high current fuse, current flows through the fuel pump relay and inertia switch to the fuel pump(s). The fuel pump relay is controlled by the PCM.
When the ignition switch is turned ON , the fuel pump(s) will operate. If the ignition switch is not turned to the START position the PCM will shut the fuel pump(s) OFF after 1 second. The PCM will operate the fuel pump(s) operate the fuel pump(s) when the ignition switch is turn to START position to provide fuel while cranking.
After the engine starts, the PCM will continue to operate the fuel pump(s) unless the engine stops, drops below 120 rpm or the inertia switch is tripped.

Dec 28, 2013 | 1989 Ford F 250

1 Answer

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.

Jan 15, 2013 | Cars & Trucks

1 Answer

Why do i have to bypass my fuel pump relay


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.
f150 fuel pump-zkue20ih5gqqvta5qpd2pmol-4-0.jpg

Mar 25, 2017 | 1988 Ford F 150

1 Answer

1991 Ford F-350 7.5. Not getting power at the Inertia Switch from the Fuel pump relay, however the EEC and Fuel pump relay are both working. what could this be?


Have you been in any type of a wreck? If so the inertia switch is located in the circuit between the fuel pump relay and the electric fuel pump(s). If you have been in a significant impact the mechanism inside the switch will cause the switch to open the electrical circuit, shutting off power to the fuel pump as a safety precaution. The inertia switch is in the cab on drivers side, up against the firewall, to the left of the brake pedal or behind the right kick panel. I would suggest buying a new one because it is not something you can reset.

Dec 25, 2011 | 1991 Ford F350

1 Answer

Where is the fuel relay


There is a fuse for the fuel on the firewall inside the cab:



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Fuel Pump The fuel delivery system uses either a high or low-pressure in-line or in-tank electric fuel pump, with some models equipped with both. It is a recirculating system that delivers fuel to a pressure regulating valve in the throttle body and returns excess fuel from the throttle body regulator back to the fuel tank. The electrical system uses two types of control relays, one controlled by a vacuum switch and the other controlled by the powertrain control module (PCM) to provide power to the fuel pump under various operating conditions.

An inertia switch is used as a safety device in the fuel system. The inertia switch is located in the cab, generally under the dashboard on the right side. It is designed to open the fuel pump power circuit in the event of a collision. The switch is reset by pushing each of 2 buttons on the switch simultaneously (some models use switches with only one reset button). The inertia switch should not be reset until the fuel system has been inspected for damage or leaks.
When the ignition switch is ON, it turns the EEC power relay ON. The EEC power relay provides power to the powertrain control module (PCM) and the control side of the fuel pump relay. Power for the fuel pump(s) is supplied through a fuse link or high current fuse attached to the starter solenoid (battery side). From the fuse link or high current fuse, current flows through the fuel pump relay and inertia switch to the fuel pump(s). The fuel pump relay is controlled by the PCM.
When the ignition switch is turned ON, the fuel pump(s) will operate. If the ignition switch is not turned to the START position the PCM will shut the fuel pump(s) OFF after 1 second. The PCM will operate the fuel pump(s) operate the fuel pump(s) when the ignition switch is turn to START position to provide fuel while cranking.
After the engine starts, the PCM will continue to operate the fuel pump(s) unless the engine stops, drops below 120 rpm or the inertia switch is tripped.

May 24, 2010 | 1992 Ford F250

1 Answer

1990 F-150, 2X2, 5.0, dual tanks, ..... no power to either fuel pump. I have replaced the fuel pump relay and the EEC relay. I have also run resistance and voltage checks at the relay harnesses. I am...


You need to check the switch on the dash for the tanks. Brown/White powers the REAR tank, Red powers the FRONT . RED/YELLOW is power, if there is no power on the red/yellow, check the "Inertia" switch. Matter of fact, check the Inertia switch FIRST. Its in the dash area near the brake pedal, maybe in the kick panel, it should be marked.

Dec 18, 2009 | 1990 Ford F150

1 Answer

Where is the fuel pump inertia switch located on a 1998 Cherokee?


there isnt one. if the fuel pump does not run, ck the ASD and FUEL PUMP RELAYS. Turn the key on and listen real close to the fuel tank, see if you can hear it come on the 2 seconds, Sometimes you can rap on the tank with a mallet or board when cranking, and this will knock it loose, it that gets it running you will need to replace the fuel pump.

Sep 27, 2009 | 1998 Jeep Cherokee

3 Answers

1993 E-350 Fuel pump not powering up.


1994 econoline fuel system electrical

Vehicle Application Escort/Tracer, Crown Victoria/Grand Marquis, Thunderbird/Cougar, Town Car, 5.0L Mustang, Aerostar, Ranger, Explorer, E-Series and Bronco.
  1. The electrical circuit of the Inertia Fuel Shutoff (IFS) switch may vary per engine/vehicle application.
  2. Inertia Fuel Shutoff (IFS) switch with fuel reset light (F-Series and Bronco).
  3. Inertia Fuel Shutoff (IFS) switch with fuel reset light (Town Car).
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Fuel Pump Circuit Operation When the ignition is switched to the ON position, it turns the EEC Power Relay on. The EEC Power Relay provides power to the EEC-IV processor and the control side of the fuel pump relay. Power for the fuel pump is supplied through a fuse link or high current fuse attached to the starter solenoid (battery side). From the fuse link or high current fuse, current flow is through the fuel pump relay and Inertia Fuel Shutoff (IFS) switch to the fuel pump. The IFS switch is a safety device used to shut off the fuel pump in the event of a collision. If the IFS switch is "tripped," it must be reset by depressing the white or red button on the top of the switch. The fuel pump relay is controlled by the Powertrain Control Module (PCM).
When the ignition switch is turned to the ON position, the fuel pump will operate. If the ignition switch is not turned to the START position, the PCM will shut the fuel pump off after approximately one second. The PCM will operate the fuel pump when the ignition is in the START position to provide fuel while cranking.
After the engine starts, the PCM will continue to operate the fuel pump unless the engine stops, engine speed drops below 120 rpm, or the IFS switch is "tripped."

System Diagnosis Note: Grounding the FP lead at the DLC will allow the pump to run continuously with the ignition switch on.

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Feb 16, 2009 | 1996 Ford Club Super

2 Answers

Fuel sysytem


there is a reset switch in the trunk on the right side under the carpet or in the trunk on the back wall by the tail lights i had same problem found it and it was the fix i have the same car 89 5.0 trunk style hope this helps

Jan 11, 2009 | 1989 Ford Mustang

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