92 Accord fuel pump runs after engine turned off

Discussion in 'Accord' started by joe, Dec 30, 2003.

  1. joe

    joe Guest

    Hello,
    The fuel pump in my 92 Accord LX (auto trans) runs for a while after
    driving and key is removed from ignition. It starts off running
    continuously, then cycles off and on with the on times decreasing and
    off times increasing until it finally stops after several minutes.

    What the heck is going on? Relay problem? Sensor problem? Gas cap
    problem?

    Thx!
     
    joe, Dec 30, 2003
    #1
    1. Advertisements

  2. The fan on my accord does exactly this as you describe, check and see if it
    is the fan. If it is indeed the fuel pump, than I am stumped.
     
    Rocket Richarde 250R, Dec 30, 2003
    #2
    1. Advertisements

  3. joe

    MajorDomo Guest

    I would suspect a leaky injector.

    mike hunt
     
    MajorDomo, Dec 30, 2003
    #3
  4. joe

    Randolph Guest

    The only way a leaky fuel injector would cause that symptom is if there
    is a control loop that actively maintains fuel pressure when the
    ignition is off. I am not aware of any car where this is the case.
    Perhaps you have some references on this?
     
    Randolph, Dec 30, 2003
    #4
  5. If your fuel pump is running then it is a stuck relay as opposed to leaky
    injector as posted previous. The drop in fuel rail pressure caused by a
    leaky fuel injector would not cause a pump to operate at all with the key
    off. If by some paranormal chance that the fuel pump was wired up to
    maintain fuel pressure at all times it would not take more that a couple
    seconds to do so. If an injector was leaking that bad then you wouldn't be
    able to start your engine due to hydraulic lock of the piston in the
    cylinder.

    I have seen water injested into an engine which caused hydraulic lockup and
    it through a rod through the side of the block. Little side note

    CaptainKrunch
     
    CaptainKrunch, Dec 30, 2003
    #5
  6. Consider the source....
     
    Stephen Bigelow, Dec 30, 2003
    #6
  7. joe

    NetSock Guest

    (Sigh)...a leaky injector would not create that situation...fuel pumps wont
    run in *any* car after the ignition is turned off.

    It is indeed a relay problem...and ignore this dolt in everything he
    says...he pulls shit out of his ass, and has no real car experience
    whatsoever. He has also been caught lying on *many* occasions.

    Good luck.

    --
    '03 S2000
    '94 Accord

    It's just about going fast...that's all...

    http://home.insight.rr.com/cgreen/
     
    NetSock, Dec 30, 2003
    #7
  8. joe

    joe Guest

    OK; would this be the "main relay" (which I understand controls the
    PGM FI), or is there a separate fuel pump relay? And if so, do you
    know where it is? Thx!
     
    joe, Dec 30, 2003
    #8
  9. joe

    MajorDomo Guest

    Indeed a stuck relay is another area to check. If you believe
    turning the key to the off position instantly cuts all power to
    the fuel system, how then would the relay still be powered and
    the pump still be running? Since the fuel loop system is powered
    through the F/A ratio process controller. If the relay was
    burned in the on position then the pump would stop as well when
    the key is turned to the off position, if not it would be
    constantly running. Because it is a complicated system beyond the
    understanding of the overage owner I would have suggest he have
    the vehicle connected to a system analyzed and have a technician
    determine the reason for the fault. Doing that however brings a
    bunch of crap about how we can fix our own
    cars why pay a diagnostic fee. That is all will say on the
    subject


    mike hunt
     
    MajorDomo, Dec 30, 2003
    #9
  10. joe

    NetSock Guest

    I thought you suspected a (LOL) leaking injector?
    Its *NOT* "powered"...its stuck!

    Only an idiot wouldn't know the difference...sheesh...
    (Yawn) No its not. F/A ratio is determined by injector pulse widths. The
    fuel "loop" system is of very basic mechanical premise.

    Yet again, you talk out your ass, and prove, yet again, you know nothing.
    Again wrong.
    Its actually a very basic system. And anybody who wanted to take 30 minutes
    could understand very easily.

    It is complicated (obviously) beyond the understanding of you maybe.
    Here we go...
    Take some basic english classes, will ya Mikey?
    Good...no more lies and crap pulled from your ass.

    --
    '03 S2000
    '94 Accord

    It's just about going fast...that's all...

    http://home.insight.rr.com/cgreen/
     
    NetSock, Dec 30, 2003
    #10
  11. The Ford trucks seemed to like doing this. Obviously it was a stuck relay.
    Took a few minutes to fix on those. The thing is that these fuel pumps
    relied on fuel going through them to cool them down. As is my understanding
    of it. And if they are running all the time without any flow then they are
    not getting any fuel from the return line and the pump would wear out
    prematurely if not corrected soon. It can also cause a battery to drain.

    CaptainKrunch
     
    CaptainKrunch, Dec 30, 2003
    #11
  12. joe

    NetSock Guest

    What year of Ford truck was this?

    Any post 1980 system had a pressure relief valve in the rack, that would
    release when a certain head pressure was reach by the pump. This overflow
    was routed back thru the return line, into the tank.

    Any post 1990 system had a end-of-line pressure regulator, that acted in the
    same way...routing excess fuel back to the tank.

    In either scenario, the pump was never "dead-heading", thus, there was
    always "flow" thru the pump.

    You are correct tho, in that the fuel flow is the coolant for a fuel
    pump...it is also the lubrication as well.

    I did replace quite a few Ford in-the-tank fuel pumps in the 80s. It seems
    the Ford pumps were much more sensitive about the needed lubrication...it
    was common to burn up a Ford pump by simply running out of fuel.

    Take care.

    --
    '03 S2000
    '94 Accord

    It's just about going fast...that's all...

    http://home.insight.rr.com/cgreen/
     
    NetSock, Dec 30, 2003
    #12
  13. joe

    MelvinGibson Guest

    Again, only in your small world does the microprocessor not
    control the F/A ratio and the fuel loop. Just what does control
    those pulses in your small world anyway, sun rays? Where does
    the power come from, that you say goes through
    that burned 'stuck' relay, if the power goes off with the key?
    Explain to us again how a master technician like you gains
    leverage on a breaker bar by using a pipe. Keep replying, I
    will pass them to on to our tech stations, they love to laugh
    at your postings. LOL



    mike hunt
     
    MelvinGibson, Dec 30, 2003
    #13
  14. I hope you're kidding.
     
    Stephen Bigelow, Dec 30, 2003
    #14
  15. joe

    Randolph Guest

    Again, only in your small world does the microprocessor not
    The micro controller regulates the air/fuel ratio but it does not
    regulate the fuel pressure. Fuel pressure is regulated with a mechanical
    pressure regulator, and the fuel pump is running continuously when the
    engine is running.
    If the relay contacts get power from the battery and the relay coil is
    powered through the ignition switch, then a stuck relay could cause the
    fuel pump to run when the ignition is off. Is the '82 Accord wired this
    way? I don't know.
     
    Randolph, Dec 31, 2003
    #15
  16. The system is probably similar to my '94 GS-R. When functioning
    properly, the pump will run continuously as long as the engine is
    running (and for two seconds whenever the engine is cranked.)
    Pressure is controlled by a mechanical regulator that releases fuel
    back to the tank. A leaky injector will not cause the pump to run
    any time it would not ordinarily be running.

    A "stuck" relay shouldn't cause the pump to run with the ignition off.
    The actual power for the pump comes from the ignition switch so even
    if the relay switches are on, that circuit is not energized. However,
    battery voltage is present within the relay so an internal fault could
    possibly send voltage to the pump, although this would seem like an
    atypical failure mode.

    Any chance that someone (alarm installer?) did any rewiring on this
    car. Even if the wiring from this job may have worked for a while, it
    is likely more prone to failures (shorts) than is the factory wiring.

    Contrary to Mike Hunt's hand waving, this problem should be relatively
    easy to solve with a VOM if you have a service manual and a little bit
    of electrical aptitude. There is nothing high tech that could be
    causing this problem.
     
    Gordon McGrew, Dec 31, 2003
    #16
  17. The main relay controls power to the PGM-FI and the fuel pump.
     
    Gordon McGrew, Dec 31, 2003
    #17
  18. joe

    Bob Guest

    Hi Joe, my 92 Accord 5 sp does the same thing. I have a main relay that I
    need to replace in my 91 Accord and was going to try it in my 92 and see if
    that fixes the problem, but haven't had time. I hope to get time after the
    first of the year. BTW, this FP problem is there about 90% of the time and
    back in late NOV it was quiet while at the dealer for an oil change. <sigh>
    If you find out what the problem is, please post back.
     
    Bob, Dec 31, 2003
    #18
  19. joe

    NetSock Guest

    Your kidding me I hope.
    The CPU controls the injector pulse widths, but the "fuel loop" is
    mechanical, aside from a relay turning on...or off the fuel pump.
    Wow...you're a piece of work...

    When two contact "fuse" together from arcing, they are...now read real slow
    here Mikey..."stuck" together. When the coil of the relay is powered off,
    the "stuck" contacts continue to supply power to the device.

    Come on...even you cant be this stupid.
    I'm not giving any physic lessons to double-digit IQ people today.
    Says more about you and your shop guys, than you can even fathom... :)


    --
    '03 S2000
    '94 Accord

    It's just about going fast...that's all...

    http://home.insight.rr.com/cgreen/
     
    NetSock, Dec 31, 2003
    #19
  20. I agree that a "stuck" relay shouldn't cause the pump to
    run unless an internal fault inside the pump, or elsewhere.
    On the 92 Accord, the relay contacts get power from
    the ignition switch. The `92 Helm service manual says
    the same. Here, take a closer look at the Accord's main
    relay and fuel pump circuit I found:

    http://techauto.tripod.com/diatest1.gif

    I think:
    1. there's a short.
    2. the OP might need to remove the main relay and check
    the 7-pins for voltages. Based on the picture above, he should
    see 12V at only one terminal. If he finds more than one, the
    relay is most likely fine. Why? Because the short is most likely
    before or after the main relay.
    Tib
     
    Tibur Waltson, Jan 1, 2004
    #20
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.