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Posted on Mar 31, 2017

When engine is cold, the fuel pump relay will not engage.after repeated on/offs with the ignition (sometimes very repeated on/off cycles with the ignition), both the fuel pump relay and the auto shutdown relays will chatter, for up to 5 minutes or more and the fuel injectors will cycle at the end of all this.the engine will now be very flooded-wait a few minutes and the engine will start and run fine, once the excess fuel has burnt off,once the engine has been warmed up it will start and run just fine.the fuel pump relays have been swapped out with known good ones and the fuel pump was recently replaced.this problem is the same with the new fuel pump as it was with the old one

5 Related Answers

Anonymous

  • 85 Answers
  • Posted on Jul 02, 2008

SOURCE: 2005 Dodge Neon

did the dealer happen to check the cam sensor we seem to have problems with them

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Anonymous

  • 373 Answers
  • Posted on Jul 17, 2008

SOURCE: chrysler 3.3 vin r v6 mini van, starts then dies

Charlie. You have replaced the ECM on your van?.
Kedwin,, Your problem is, the computer on that 3.3 L.
Need to be programed with the VIN nember of your car.
The Antitheft System will disable the injectors due a incorrect VIN, Bucause the body computer is not recieve the correct pasword between 5 seconds after start up.
YOU have 2 options. 1 get a ALOHA Smith. some of they have the computer required to program ECMs.

The other option is: Get a new ECM from the dealer, They will program if ask for that.

NOTE:::::: Other way is . Put the body control module with the computer from the same car.

OK... I hope this work for yours.
If NOT letme know I can look for more information.
Thank you.

Anonymous

  • 25 Answers
  • Posted on Dec 30, 2008

SOURCE: Fuel pump will not run, 96 Neon 2.0 SOHC

Personally I wouldnt bother tracing the wire as it is probably not worth your time, and just run a constant 12v from the battery to the relay on like 10ga wire. There is probably a short somewhere in the system which can be a real headache to find.

Also it may sound dumb, but check your fuses, and the fusible links under the hood. Chances are that they are all fine though, especially if you have dash lights.

Molson02536

Harvey N Tawatao

  • 3854 Answers
  • Posted on May 26, 2009

SOURCE: Won't run

There are to many things that can cause the no start. Here is a link that can help you understand the possible problems and links to how to retrieve the DTC codes which is activating your Auto Shutdown relay.
Good luck and hope this helps. Keep me posted http://www.allpar.com/fix/stall.html

Molson02536

Harvey N Tawatao

  • 3854 Answers
  • Posted on May 26, 2009

SOURCE: 97 Dodge Caravan Auto-Shutdown Problem

Been working on my dad's 97 Caravan longer then i can remember for things you mentioned and have been not able to get him to sell it.
I found that the electrical connections are prone to corrosion and have replaced lots of the wire and pin connection in the wire harness, thank god i have time on my hands.
The instrument panel where the wire harness connects, i found that the solder goes bad and i had to re solder the connector on the back side of the circuit board, where the harness goes so you need to remove the instrument panel from the dash,
Here is a link that can help you retrieve DTC codes and do research on your caravan. I'ld tell you everything what i needed to do to keep my dad's caravan running but that would be a novel. http://www.allpar.com/fix/stall.html

Good luck and keep me posted, glad to help you keep yours running too.

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1answer

What relay is to the fuel pump

The fuel pump relay is a small unit covered in a plastic case, which has several sprockets on one side that are clipped onto the ignition system. The fuel pump relay is what turns on the fuel pump when you start your car and powers it down when you shut off the ignition.

The engine control module (ECM) uses the fuel pump relay to control when the fuel pump is on. The fuel pump relay supplies electricity to power up and power down the fuel pump.

It's located in different places on different cars. It could be under the hood, on the firewall, on one of the fender covers or near the steering column, to name a few locations. As for a Nissan Terra (Nissan Terra ?????), it is often found in the fuse box located in the engine bay.

When you turn the key in the ignition forward to crank the car, the "start cycle" begins and fuel pump relay is engaged long enough to turn on the fuel pump. It shuts off again when the engine is running. Once the engine is running, the fuel pump relay shuts off, and the current for the fuel pump is supplied by the oil pressure sending unit. The other time the fuel pump relay is engaged is when you shut off the ignition. It engages long enough to shut off your fuel pump.
1helpful
1answer

Have a 1988 Landcruser sometimes when I switch on the ignition relay clicks engine will turn but will not start on turning key on and off a few times once the relay doesn’t click engine will start what...

possible problem is a weak fuel pump. The fuel pump relay will engage for about five seconds each time the key is turned to the start position. If the fuel pump is weak then there is nor enough pressure to fire the injectors until the key is recycled several times. You should connect a fuel pressure tester to the fuel system to see if that is what is happening. Try turning the key on and off several times waiting 3 or 4 seconds between turns and then all the way to start.
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1answer

Volvo s80 engine starting failure

Fuel pump relay . Or fuel pump could be a bad earth lead You need to narrow this down to 1 fuel or 2 ignition ..
0helpful
1answer

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.
  • 0helpful
    3answers
    3helpful
    4answers

    I have a '91 F350 Dually w/a 7.3I diesel and it will not start when cold without using starting fluid. I replaced the glow plugs but they all checked good with a meter... currently recharging the batteries...

    YOU CAN HOOK A 12 VOLT TEST LIGHT BETWEEN THE POWER RELAY OUTPUT TO GLOW PLUGS AND GROUND.WITH ENGINE COLD IGNITION SWITCH ON ENGINE NOT STARTED.THE TEST LAMP WILL LIGHT WHEN IGNITION IS TURNED ON.LAMP WILL BE LIT FOR FOUR TO TEN SECONDS DEPENDING UPON ENGINE COOLANT TEMPERATURE.TEST LAMP WILL THEN REPEAT ON OFF CYCLE.AFTER ENGINE IS STARTED.THE TEST LAMP CONTINUES TO REPEAT ON OFF CYCLE FOR 20 TO 90 SECONDS.LAMP WILL CYCLE FOR A MAXIMUM OF 90 SECONDS AFTER ENGINE IS STARTED.ENGINE STOPPED THEN RESTARTED.TEST LAMP WILL LIGHT IF COOLANT TEMPERATURE AT THE ENGINE TEMPERATURE SWITCH HAS FALLEN BELOW 165 DEGREE.BETWEEN STARTS THE SYSTEM WILL OPERATE FOR A SHORTER PERIOD OF TIME THAN WITH A COMPLETELY COLD ENGINE.TEST LAMP WILL REMAIN OFF. IF COOLANT AT THE CONTROL SWITCH PROBE IS AT 165 DEGREE OR HIGHER.
    0helpful
    2answers

    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!
    2helpful
    1answer

    Trying to reset theft system

    Can try doing a  relearn process, it is pretty simple and will take 30 minutes, if it'll work for you at all since your problem doesn't sound like a computer issue.
    30-Minute Learn Procedure
    1. Turn on the ignition, with the engine OFF.
    2. Attempt to start the engine, then release the key to ON; the vehicle will not start.
    3. Observe the SECURITY tell tale light. After approximately 10 minutes, the light will turn OFF.
    4. Turn OFF the ignition switch, and wait 5 seconds.
    5. Repeat steps 1 through 4 - two more times - for a total of 3 cycles of 10 minutes. 3x10 = 30 minutes.
    The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch turn from OFF to CRANK.

    Important:
    Turn the Ignition Switch OFF.
    The vehicle learns the Passlock Sensor Data Code and/or password on
    the next ignition switch transition from OFF to CRANK. You must turn the ignition
    OFF before attempting to start the vehicle.
    6. Start the engine. The vehicle has now learned the Passlock Sensor Data Code
    and/or password.
    7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100
    ignition cycles.
    Without a scan tool you may have momentary starter interruptions while history clears itself.

    Good luck and hope this help's. keep me posted if you need other ways to disable the passive lock system

    0helpful
    1answer

    2001 GMC Sierra, 4.8 occasionally wont start.

    sounds like starter solenoid,try cycling the ignition on start on start repeatly but do not go back to the off position off on start will activate the fuel pump repeatly and might flood it,with a faulty solenoid you can usually cycle the ignition repeatly and it will finally engage the starter
    Not finding what you are looking for?

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