Question about 1991 Lincoln Town Car

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Re fuel pump problem

I located the fuel pump inertia switch,it was down so i used a screwdriver
to lift up on it.it came right up,the car still wont start, how is the switch supposed to work.and what other problem could it be.

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The switch is supose to be in the down position. push the switch back down get in car and close all windows and turn key to on position and lisen for the fuel pump to run for a couple seconds sounds like a low hum that only last for 2 to 3 seconds if you dont hear this then the fuel pump is bad

Posted on Feb 16, 2009

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2004 mercury marauder. Y wont the fuel pump kick on???


Could be that the Inertia switch has cut it off. Check Websites with the term "2004 mercury marauder inertia switch" then add location to the search if the first search only generates parts.

This is a safety device and is a part which cn be in different locations depending on the year.


In addition to the Inertia switch, a fuel pump relay or a crankshaft sensor can do the same thing.

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99 expedition my fuel pump isnt working checked fuses is there a fusuble fink with key on the fuel shutt off switch behind right kick panel has no power to any of the wires?


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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.

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have you located the inertia switch? you didn't mention.
If you HAVE located it, and "reset" the switch(pused the button down/made sure it was down) and it didn't work. its bad!

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1 Answer

Car will turn over but won't start. Through the


No noise from fuel pump when you turn over the car .First thing get voltage at fuel pump relay checked, is there 12 volt to the relay.If no, then problem is again the relay.--------- To reconfirm the problem, try other test, that is remove the relay and by pass the relay terminals with a jumper wire .Then with 12 volt external battery give power to fuel pump connector and see, if the fuel pump starts, then its clear that fuel pump relay is faulty.----------- Also other problem can be fuel pump inertia switch.If the inertia switch is faulty then also fuel pump will not start.-------- The fuel pump relay on a 1995 Ford Explorer is in the power distribution
box, in the engine compartment, driver's side near the firewall.----------
The fuel pump inertia switch is in the right front passenger area
it is below the dash but above the carpet in the right hand corner.--------
Its a push button type inertia switch.
--------
Fuel Pump Activation
When ignition switch is turned to START position, PCM operates fuel pump relay to provide fuel for starting engine. PCM senses engine speed and shuts off fuel pump by opening ground circuit to fuel pump relay when engine stops or engine speed drops to less than 120 RPM. When ignition switch is in ON position, EEC power relay is energized (contacts closed). Power is provided to fuel pump relay and timer in PCM. Fuel pump receives power through fuel pump relay contacts.
Inertia Fuel Shutoff (IFS) Switch
All models use an electrical interrupt switch in fuel system. During a collision or vehicle rollover, electrical contacts within inertia switch open, shutting off fuel supply to electric fuel pump. Fuel supply is interrupted even when engine is running.
A reset button is located on switch assembly. If electrical circuit trips, vehicle will not restart until switch is reset. Fuel system should be inspected before resetting switch.
IFS switch is located under instrument panel, near right side of transmission hump.
----------- If the fuel pump relay, the inertia switch and fuel pump all checked ok, and fuel pump is working with direct 12 volt source to fuel pump.Then problem relates to computer.The computer (power control module, PCM) is faulty and has to be replaced.--------- This will help.Thanks.Helpmech.

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1 Answer

Truck will not start and i need to know where the fuel pump relay is located?


Your fuel pump relay is in the under the hood fuse box and should be marked. If not looking into the fuse box you"ll have two rows of fuses (side by side ) totaling 18 fuses, there are two relay just above the two rows of fuses and the one directly above the fuses is the fuel pump relay. Also you mite want to check your inertia switch and make sure the red center button is depressed ! you"ll find the inertia switch located behind the right hand kick panel (down on the floor inside the vehicle,passengers side ) good luck thanks for using fixya

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1 Answer

Where is the fuel pump relay button located


If you're talking about the Inertia switch, the following may help: Inertia Switch GENERAL INFORMATION This switch shuts off the fuel pump in the event of a collision. Once the switch has been tripped, it must be reset manually in order to start the engine. The inertia switch is located on the toe-board, to the right of the transmission hump, in the passenger-side footwell.

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