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No power to fuel pump

Fuses are good,no power at inertia switch

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  • Cars & Trucks Master
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chiquititas
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SOURCE: electric fuel pump inertia switch?

above the gas tank

Posted on May 15, 2008

  • 11 Answers

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

  • 1 Answer

SOURCE: electric fuel pump inertia switch?

where is the fuel pump pressure switch located no 1992 z28 camaro. also there are 3 wires coming out to fuel pump at back of car pink grey brown what do they go to.

Posted on Nov 10, 2008

  • 1861 Answers

SOURCE: I have a 99 tacoma with no power to fuel

Look to see if you have power at pin 1 of the circuit opening relay. The C.O. Relay is what powers the fuel pump. If you have power there (a blue wire), you have an open circuit between the relay and the pump.

Posted on Jul 17, 2009

  • 13 Answers

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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1 Answer

1998 windstar fuse box which fuse is for the fuel pump


Fuse N 20 amp , under hood fuse box . There is also a fuel pump relay ,which the PCM - engine computer turns on to supply power to the fuel pump . Plus in the circuit is a inertia fuel shut off swith , this is incase of a wreck .I would check to see if the inertia switch was tripped . Location
Inertia Fuel Shut-Off (IFS) Switch C322
On lower LH "A" pillar, under I/P

I would also watch this video on fuel pump electrical circuits !
Fuel Pump Electrical Circuits Description and Operation

Dec 14, 2016 | 1998 Ford Windstar

1 Answer

2000 mazda protege 1.6 liter dx..... I have no power to my fuel pump I have replaced the pump and relays and fuses are good... Where is my inertia switch on this vehicle


No inertia switch on the Prot?g?. Ford thing. Not used by Mazda. No voltage to the Red with white stripe wire at fuel pump?

Sep 18, 2015 | Mazda 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

I have a 1996 mustang v6 no power to fuel pump. Bought used fuel pump relay still have np power. Safty switch is good. Unpluged fuel turned switch on and i have constant power of 9.52 volts plug in pump...


9.5 volts sounds like the power coming from the gas gauge.
I am showing a relay module with the fuel pump and pcm relays built in along with two other relays. The fuel pump relay should not be accessable. In most cases the pump relay gets power from a 20amp fuse and the computer grounds the relay when needed. Power goes from the pump relay to the inertia switch then to the pump. So the inertia switch should be hot when the pump relay is activated.

Jun 12, 2013 | Cars & Trucks

1 Answer

2000 ford mustang 3.8 no power at fuel pump fuse is good relay is good it does have a anti theft device, inertia is good


You have a fuel pu,p driver module that gets the power from the inertia switch and the power for the fuel pump comes from that module. I would start by checking for a wiring problem. Below is a picture of where that module is located. At the plug of the module you want to make sure you have good continuity from the pink and black wire at the module to the inertia switch. Then you will want to make sure you have continuity from the fuel pump to the module in the brown and pink wire. That should be the power source to the fuel pump. One other thing to keep in mind and that is the PCM controls ground to the fuel pump so this may be an issue. Try that first to see if you have a wiring problem. If you have power from the inertia to the module but no power coming out of it to the fuel pump this may be your problem. Hope I was able to help...

2_29_2012_9_12_02_pm.jpg

Feb 29, 2012 | 2000 Ford Mustang

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.

Feb 13, 2011 | 1992 Ford Thunderbird

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

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

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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