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Anonymous Posted on Feb 24, 2010

Fuel pump relay switch not working/ fuel pump emergency switch?

Fuel pump relay switch not working? car woulnt start, not igniting or something, but you can hear the fuel pump running? maybe something with the emergency shut off switch?

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Kirk Augustin

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  • Mercury Master 2,019 Answers
  • Posted on Feb 25, 2010
Kirk Augustin
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If the pump is making sound, then the relay must be ok.
It could still be weak, but you could tell with a pressure gauge.
(Harbor Freight sells a gauge kit cheap.)

But make sure the ignition is working first, by spraying in some starting fluid.
It is even sputters, then you know the ignition is ok.
If not, then check all the fuel injection connections.
The the temperature sensor and mass air sensor.
Use an ohmmeter, and check resistance against the norm.

Wayne Tolonen

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  • Master 394 Answers
  • Posted on Feb 25, 2010
Wayne Tolonen
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Might try another filter,???

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Dennis Mulford

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  • Master 1,055 Answers
  • Posted on Feb 24, 2010
Dennis Mulford
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Weak fuel pump,or cloged filter,or bad fuel pressure regulator!!!

Testimonial: "i changed the filter was full of black sludge installed a new, had some gas pressure at first now nothing."

  • Dennis Mulford
    Dennis Mulford Feb 28, 2010

    you prob need too drop and flush the tank and replace the filter agaig!!!

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Related Questions:

0helpful
1answer

No power to fuel pump relay

There is an emergency fuel pump safety shutoff in case of an accident that will automatically shut fuel pump off so fuel does not keep pumping out at the scene of a crash. The reset button is usually in the trunk depending on what vehicle you have. Your manual will identify location for you.
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I cant locate the fuel shut off switch on 91 ford econoline 250 super 5.8L

The inertia switch is on either side of the dash near the doors. Look around the emergency brake pedal or around the heater box.
I would check the fuel pump relay and the ECM relay.
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Changed fuel pump i put a new battery in changed fuel relay switch and still wont start spryed startin fluid in air hose it will crank and imediatley die? what do i do i have tried everything people...

is the security light flashing when the key is turned on? if so you have a security issue and not a fuel pump problem. the ECM shuts off the fuel injectors so the car won't start. the ignition fire is still good so the car runs on starting fluid. check the light and then email me with more info.
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Fuse and relay for the fuel pump

The fuel-pump relay unit is responsible for turning the fuel pump on when it detects the engine is running. When the ignition signal stops, the fuel-pump relay switches the pump off. Problems with the ignition and starting the vehicle often can be traced to the condition of the fuel-pump relay.

Description

  • The fuel-pump relay is a small unit, typically enclosed in a plastic case. The unit contains several sprockets on one side that are clipped onto the ignition system. The fuel-pump relay is engaged only during the start cycle. If it is faulty, it can take longer to start your vehicle.
  • Location
  • Most fuel-pump relay units are located under the dashboard near the steering column. In some cases, the unit is located in the area where the steering column is mounted or near the engine's firewall. The end of the fuel pump relay is typically located near the center of the floorboard, under the carpet in the front section of the passenger's or driver's side footwell.
  • Considerations
  • In addition to difficulty in starting the vehicle, symptoms of a poorly functioning fuel-pump relay include the following: the car dies then starts a few minutes later; the fuel pump makes a strange noise (humming or clicking loudly) for longer than five to 10 seconds after starting; or the engine won't start after you have engaged the fuel-pump switch.
  • Troubleshooting
  • When your car does not start properly, you can conduct a fuel-injection relay test. Two relays are located inside the fuel-injection system; one of them is responsible for turning the ignition on without turning over the engine, and the other is responsible for turning on when the engine turns.



    You can check to see if the first relay is working by touching it while turning the ignition on and off. You should feel a "click" every time you switch the ignition. If the fuel-pump relay is not working, you can "jump" the unit with a small lead jumper cable. You will need to access the fuse panel and insert the cable into the relay unit; the unit will run as long as the wire is inside the relay and can help start your car.
  • 1helpful
    1answer

    Will not start up fuel was low fuel relay /pump

    Reset the electronic fuel pump there are instructions on this procedure under the hood on the radiator support. it says if vehicle does not start..... Just follow instructions and it should work.
    __________________________________

    Answer FUEL PUMP SHUT-OFF SWITCH
    After a collision, if the engine cranks but does not start, the fuel pump
    shut-off switch may have been activated. The "Fuel Reset" indicator light
    will illuminate in the instrument cluster. The shut-off switch is a device
    intended to stop the electric fuel pump when your vehicle has been
    involved in a substantial jolt.
    1. Turn the ignition to the OFF position.
    2. Check the fuel system for leaks.
    3. If no fuel leak is apparent, reset the fuel pump shut-off switch by
    pushing in the reset button.
    4. Turn the ignition to the ON position. Pause for a few seconds and
    return the key to the OFF position.
    5. Make a further check for leaks in the fuel system.
    Roadside emergencies
    The fuel pump shut-off switch is
    located in the passenger's foot well,
    behind the kick panel.


    if that dosent work try replaceing fuel filter
    0helpful
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    Both fuel pump relays run hot. I have replaced both of them. The truck started and ran for about 30 minutes then quit. I replaced the relays and it ran for a few minutes and quit again.

    You could have a bad fuel pump relay switch. The fuel pumpmag-glass_10x10.gif relay switch gets the fuel pump running in the vehicle during the start cycle. The terms fuel pump relay and fuel pump relay switch are used interchangeably. The fuel pump relay begins its job when the automobile operator turns to the ignition on, but before the motor is actually running. At that point, the fuel pump relay in some cars sends a signal to the ignition switch, which in turn sends a signal to the fuel pump to turn on. Others fuel pump relays have actual circuitry inside of them that receive the ignition signal and directly signal the fuel pump to engage.

    Have a great day!
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    No power in fuel pump wiring

    If you have the ignition in the on position remeber the fuel pump only runs for a couple of seconds unless the car is activley being started
    Not finding what you are looking for?

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