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I have power to the Relay , But not the inertia switch , what do I check ?

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  • Cars & Trucks Master
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Year, make, model, and engine size?

Posted on Nov 28, 2012

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Posted on Jan 02, 2017

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SOURCE: 2004 ford E350 no power to fuel pump

put a test light on the ground wire to a 12v power source and see if the pump is grounded properly

Posted on Sep 11, 2008

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SOURCE: cant get power to fuel pump on a 1986 ford van 300 six cylinder

The Fuel Pump Relay Is Mounted Under Hood On Driverside Firewall Right Under The Hood Hinge In A Black Case

Posted on Jul 16, 2009

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SOURCE: 1999 ford taurus with fuel issues checked the

At this point I would get a haynes manual from somewhere like autozone so you can get the wiring schematic. I believe the relay is turned on by the computer. It sounds like there is a wiring issue between the relay and the inertia switch. Have you checked the harness long the frame for damage or plugs in the engine bay.

Posted on Jan 02, 2010

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SOURCE: e-150 fuel pump inertia switch location

on some fords it is on pass side kick panel you have to feel in a hole and you will feel a reset button,hope this helps

Posted on Feb 14, 2010

jturcotte
  • 8578 Answers

SOURCE: My 2002 Expedition Doesnt have

the relay. Try swapping the fuel pump relay with the wiper relay. These are in the engine compartment relay box. If this doesn't help, please get back to me.

Posted on Dec 18, 2010

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1 Answer

Where can I find the inertia switch on my 98 Chevy Tahoe?


There is no inertia switch used on GM vehicles ! No power to the fuel pump ? Check the fuel pump relay in the under hood fuse / relay box. GM Fuel Pump Relay Testing

Oct 09, 2015 | 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

No power to fuel pump.


What kind of car/truck is it? Is the inertia switch in trunk?

If you have power before relay but none after the relay is bad.

The inertia switch can also get tripped by very hard bumps jolts etc and has to get reset if it does.

Feb 02, 2013 | Cars & Trucks

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.

Jul 17, 2011 | 1995 Ford Explorer

2 Answers

No fuel to the rail. New pump,filter,control module over radiator(2).checked inertia switch. if wire to inertia switch is same color code as wire leaving ECM then no power leaves ECM when switch is...


It helps if you tell what year,model, engine you are working on. Is power at the Inertia Switch? The power comes from the FUEL PUMP RELAY, the ECM only grounds the relay to turn it on. but not knowing what you are working on, thats all the info I have .

Sep 07, 2010 | Ford Taurus Cars & Trucks

2 Answers

I have replaced the fuel pump amongst a lot of other things. I can spray gas or starting fluid in the throtal body and it will run rough untill the fumes ware out. Its a 1995 ford explorer 4x4 xlt


If you hear the fuelpump operate the first 1 or 2 seconds when the key is turned to RUN position, the fuelpump is working. If you do not hear the fuelpump run, check the Inertia switch which should be in the side panel of the rear cargo area. If you have an owners manual check for the Inertia switch location.

To reset the Inertia switch, hold the button on it for 2-3 seconds. You should now hear the pump run. You may also have a fuelpump relay under the hood in one of the Powerboxes. The Powerbox may have a fusible link from the Battery. When the fusible link is OK and the Pump Relay is OK, there is a fuse in the Fuse panel. Then finally the Ignition switch will trip the Pump relay. As power flows through the wire to the fuelpump the Inertia switch can break the power connection.

So you have 5 powerpoints before the fuelpump will work. Fusible link, Pump Relay, Fuse Panel, Ignition Switch,and Inertia switch. These must all work before the fuelpump can run.

Aug 14, 2010 | 1995 Ford Explorer

1 Answer

I have a 1998 ford wind star new fule pump but still not geting fule , wont crank engine turns ove but won;t start


INSTALL PRESSURE GUAGE THEN CK, VOLTAGE TO PUMP PCM TURNS ON PUMP RELAY FOR 2 SECONDS WHEN KEY CYCLED ON ,, IF NO POWER CK INERTIA SWITCH ( MAY BE TRIPPED ) IF NO POWER TO INERTIA SWITCH CK FUEL PUMP RELAY IF NO VOLTAGE AT PUMP RELAY THEN CHECK FOR SPARK AT PLUGS IF NO SPARK CK PCM POWER RELAY IT SUPPLIES VOLTAGE TO PCM THAT INTURN POWERS FUEL PUMP RELAY

HOPE THIS HELPS

Aug 08, 2010 | 1998 Ford Windstar

1 Answer

1997 Ford F150 Electric Fuel Pump will npt pump


Did you check the fuel inertia switch in the passenger side kick panel ?

The fuel pump is powered :
the fuse to the fuel pump relay.
The fuel pump relay to the fuel inertia switch
The fuel inertia switch to the fuel pump itself.

At the fuel inertia switch in the kick panel, power from the relay is the Dark Green w/ Yellow stripe wire and the pink w/ black stripe wire is the power. from the fuel inertia switch to the fuel pump.

If you jumper the fuel pump relay, you should hear it run. If not pull the fuel pump relay, and check the pins in the relay socket, pin 30 should be the power from the fuse.

50b0c31.jpg

If you have power at pin #30, jumper the relay socket as shown with the red line above, and check the dark green w/ yellow stripe wire at the fuel inertia switch for power.
Press the button on the top of the fuel inertia switch, and check for power leaving the fuel inertia switch on the pink w/ black stripe wire.

This is tests good, check for power at the fuel pump, same pink w/ black stripe wire.
Fuel inertia switch info is in the owners manual, If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Jan 03, 2010 | 1997 Ford F150 Regular Cab

1 Answer

No power to the fuel pump.


did you check the relay?

May 30, 2009 | 1991 Hyundai Sonata

3 Answers

My fuel pump is not getting power, I've changed the relay but still not getting power to the fuse or the pump


The fuel relay and inertia switch could be two different items. The inertia switch kills power to the pump. If there is a relay in between the inertia switch and the pump, then it would mean the inertia switch was tripped by slamming a door or an impact. Check your owners manual for the inertia switch. This website advertises online service manual reference.

Apr 26, 2009 | 1991 Volkswagen Golf

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