Question about 2004 Ford F150

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I have a 1990 F-150 with a straight 6, 300 engine. The fuel pump continues to run with the ignition position on off. The only way I could get it to turn off is to disconnect the battery cable from the battery. I have read that it may be the the fuel pump relay, some say fuel pump. Any ideas?

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Hello HK.
I have seen this happen quite a few times back when I worked at Ford.
The fuel pump relay contact is sticking.
You will find it on the front left top fender under the hood. There is a black housing that houses two relays. The relays are pushed in from below the box.
The one with the green cover is the fuel pump relay.
Replace that one, it should repair your problem.

Thank you for using FixYa.

KL

Posted on Nov 12, 2010

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2 Answers

I have a 1987 chrysler conquest tsi and fuel pump only runs when key is on start not on run but pump fuel lines not hook only power wires to pump is this how it works?


What does it do with the lines hooked up ? Most fuel injected vehicles need an RPM signal to let the computer know the engine is running to let power continue to the pump .

Feb 04, 2016 | Chrysler Cars & Trucks

1 Answer

I have a 1996 Acura 3.5 R.L. just put a new fuel pump in and it won't start. It turns over, but will not stay started.


Check your main fuel relay.



Fuel Supply System


PGM-FI Main Relay


Description


This PGM-FI main relay is located behind the dashboard


lower cover. The PGM-FI main relay actually contains


two individual relays. One relay is energized whenever


the ignition is on. It supplies battery voltage to the PCM,


power to the fuel injectors, and power for the second


relay. The second relay is energized for 2 seconds when


the ignition is switched on, and when the engine is running.


It supplies power to the fuel pump.


PGM-FI


MAIN RELAY



FUEL


PUMP


RELAY


Relay Testing


NOTE: If the engine starts and continues to run, the PGMFI


main relay is OK.


1. Remove the PGM-FI main relay.


2. Attach the battery positive terminal to the No. 3*


terminal and the battery negative terminal to the


No. 2* terminal of the PGM-FI main relay. Then


check for continuity between the No. 5* terminal and


No. 2 terminal of the PGM-FI main relay.


• If there is continuity, go on to step 3.


• If there is no continuity, replace the relay and


retest.



*: 8P CONNECTOR


To FUEL PUMP


3. Attach the battery positive terminal to the No. 4 terminal


and the battery negative terminal to the No.


7* terminal of the PGM-FI main relay. Then check


that there is continuity between the No. 3 terminal


and No. 1 terminal of the PGM-FI main relay.


• If there is continuity, go on to step 4.


• If there is no continuity, replace the relay and


retest.


4. Attach the battery positive terminal to the No. 1 terminal


and battery negative terminal to the No. 2*


terminal of the PGM-FI main relay. Then check that


there is continuity between the No. 5* terminal and


No. 2 terminal of the PGM-FI main relay.


• If there is continuity, the relay is OK;


If the fuel pump still does not work, go to Harness


Testing on the next page.


• If there is no continuity, replace the relay and


retest.



To PCM CONNECTOR


TERMINAL A4


To ST. SWITCH


To GROUND


To IGN. 1 To BAT


To PCM


CONNECTOR TERMINALS


A13 and B1


FUEL PUMP


RESISTOR


FUEL PUMP

Sep 18, 2013 | 1996 Acura TL Series

1 Answer

Repacing fuel filter on 1996 intrepid


1) Relieve the fuel system pressure by first removing the fuel pump relay from the Power Distribution Center. Then, start the engine and let it to run until it stalls. Try starting it again and allow it to run until it stalls. Continue restarting the engine until the car will no longer start. Turn off the ignition.
2) Disconnect one electrical connector from an injector. Use an alligator clip to connect an end of a jumper wire to either injector terminal. Connect the other end of the jumper wire to the positive side of the battery. Then, connect an end of a second jumper wire to the other injector terminal. Very briefly touch the other end of the jumper wire to a ground.
3) Locate the fuel filter, which is part of the fuel pressure regulator mounted on the fuel pump module. Disconnect the negative battery cable, then lower the fuel tank. Disconnect the fuel lines from the filter.
4) Remove the fuel line from the pressure regulator. Remove the filter/regulator by pushing in on the locking tab on the filter as you turn the regulator to unlock it. Then, pull it straight up.
5) Push the new fuel filter into the fuel pump module. Turn to lock it in place. Connect the fuel lines, and then you can reinstall the fuel tank. Check for leaks when you start the engine on your Dodge Intrepid.

Parts Of BMW.





May 30, 2012 | 1999 Dodge Intrepid

1 Answer

Car cranks but dose not start, there is no power to distributator or fuel pump


I suspect the at this point, the main relay is defective. This relay controls power to fuel and spark circuits.

The PGM-FI Main Relay is actually comprised of two individual internal relays. When the ignition switch is initially turned ON , the Powertrain Control Module (PCM) supplies ground to the PGM-FI Main Relay. This ground triggers one of the PGM-FI internal relays that sends battery voltage to the fuel pump for two seconds to pressurize the fuel system.
When the engine is running the PCM supplies a continuous ground to the PGM-FI Main Relay. The supplied ground keeps the relay in the "closed" position providing electrical current to the fuel pump, keeping the fuel loop pressurized while the engine runs.
If the engine is not running with the ignition on, the PCM cuts the ground to the PGM-FI Main Relay, causing the relay to "open" and stop the electric current flow to the fuel pump. As mentioned previously, if the engine is not running, the PCM will only supply ground to the PGM-FI Main Relay for two seconds when the ignition switch is initially switched to the ON position.
The PGM-FI Main Relay also supplies electrical power to the Idle Air Control (IAC) Valve and to the fuel injectors.

TESTING


If the engine starts and continues to run, the PGM-FI Main Relay is working and does not need to be replaced.
  1. Locate and remove the relay.

On some models of the Civic and Civic del Sol it is located to the left of the steering column under the dash. Many later models position it either near the passenger right side kick panel under the dash or by the driver left side kick panel up under the dash.
  1. Attach the battery positive terminal to the No. 2 terminal.
  2. And the battery negative terminal to the No. 1 terminal.
  3. Check for continuity between terminal No. 5 and 4.
  4. If there is no continuity, replace the relay and retest

Aug 05, 2010 | Honda Civic Cars & Trucks

1 Answer

1990 4Runner, 3.0L engine, fuel pump pressure test?


The pump should be running and producing fuel when ignition switch is in the on position.

Jun 03, 2010 | 1990 Toyota 4Runner

1 Answer

Does a fuel pump continue to pump fuel with ignition on when the fuel line is diconected from fuel filter The car wont start no codes found it has done this a few times this year it runs fine when running...


you have a bad fuel pump it's in the tank and only comes on in these conditions.
1. ignition switch turned to the run position turns on for two seconds.
2. same as above but when engine starts pump continues to run as long as engine runs. and the safety switch for blow out prevention has not been tripped.

Your problem is the fuel pump and fuel sock and the check valve in the pump. only one way to be sure and that's pressure testing. You hook up gage to fuel rail turn the ignition key to the run position look at pressure should read 40 to 50 psi and should hold for 1 minute, if you drop 5 pounds in one minute pump is bad and even if it started they could verify that the check valve is not holding pressure.
This is caused by the life of the pump by using gas with ethonal in it and your car was not designed for it, so it damages the pump and injectors and destroys the filter in the pump.

Nov 28, 2009 | 1996 Lincoln Town Car

1 Answer

No Power to Fuel pump


I would check the ground for the fuel pump relay that operates the switch side of the relay.
You should have 2 12v inputs to the relay. When the relay gets 12v input, it closes the relay switch on the heavy current side that sends 12v to the fuel pump.

A relay is needed because you don't want heavy current going through the switch.

Also, most cars only run the fuel pump for 2 seconds when the key is turned on because you don't want the fuel pump running without the car running. If you listen closely at the fuel tank, you should hear the pump run for 2 seconds when you turn the key to "ON"
When the key is turned to "START", the fuel pump should run continuously.
The engine computer tells the fuel pump to shut off if the engine rpms are zero.
So, I would check the switch side of the relay. Power amd ground.

Mar 01, 2009 | 1992 Jaguar XJ6

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

1 Answer

No fuel coming out of fuel line


the system is working properly, the engine has to start for the fuel pump to continue to get 12 volts, if u cylce the key on the pumps runs a few seconds and then goes off, your pump is getting correct signal it just isn't running, u need a fuel pump.

Jan 09, 2009 | 1995 Nissan Quest

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