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Fuel pump failing?

Discussion in '1st Gen. Tacomas (1995-2004)' started by SigBur, Jan 19, 2013.

  1. Jan 19, 2013 at 12:16 PM
    #1
    SigBur

    SigBur [OP] Active Member

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    Good day. Yesterday, out of the blue, my 98 tac 6cyl with 212K wouldn't start. Started banging on the gas tank and she fired up and got me home. This morning I drove to work, and when I came back out she wouldn't start again. After some cursing and fiddling, got my gf to start the truck while I was under it banging on the tank, and she fired up again and got us home. Waited 30 mins, and it wouldn't start again. When it's running it runs great, fuel delivery seems perfect.

    Failing fuel pump?
     
  2. Jan 19, 2013 at 12:19 PM
    #2
    JudoJohn

    JudoJohn Well-Known Member

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    maybe. maybe your truck likes your girlfriend beating on him? LOL
     
  3. Jan 19, 2013 at 12:19 PM
    #3
    BamaToy1997

    BamaToy1997 Wheel Bearing Master

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    Yes. The fuel pump is having a problem getting started. You banging on the bottom of the tank jostles it and it begins to spin. Once spinning it runs fine. Common failure.

    Replace the pump before it stops completely though.
     
  4. Jan 19, 2013 at 12:24 PM
    #4
    SigBur

    SigBur [OP] Active Member

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    Thats what I was afraid of. So drop the tank or pull the bed? By the way, I love your sig.
     
  5. Jan 19, 2013 at 8:35 PM
    #5
    KerlyQ

    KerlyQ Well-Known Member

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    Magnaflow exhaust. Custom leather Katskinz. Fujita CIA. Custom canopy. Armourthane sprayed bed. Grey wire mod. Black American eagle wheels. Dick Cepeks FCII's. Black Emblems all around. TRD oil cap. Ignition Light Ring Mod. Blue LED dash and controls.
    I just had the same thing happen to me, thought id share my experience. Had my truck for 7yrs and this is the first thing to go...I banged on my tank too but it would only stay running for 1-2 mins. I ended up replacing the pump myself with a cheap "made in china" pump from NAPA auto parts because Im still recovering from Christmas. I paid $180 for it but the actual OEM one is $360 and is made by DENSO...Dont do what I did, get the DENSO. I already regret putting something made in china in my taco.
     
  6. Jan 19, 2013 at 8:49 PM
    #6
    BamaToy1997

    BamaToy1997 Wheel Bearing Master

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    Depends. I have seen some lift the bed, and others drop the tank. My personal preference is to lift the bed.
     
  7. Jan 19, 2013 at 9:07 PM
    #7
    4WD

    4WD cRaZy oLdmAn

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    I love Durango, you guys still get all the deer runnning thru town in winter ??



    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    This & probably a combination of worn windings in pump motor &/or corrosion around the shaft/impeller
     
  8. Jan 19, 2013 at 9:11 PM
    #8
    Justus

    Justus fucks not given

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    Does gadget offer 1st gen fuel pumps?
     
  9. Jan 20, 2013 at 8:52 AM
    #9
    tomboy75

    tomboy75 Member

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    I just replaced the fuel pump on my 98 Tacoma. I'll explain my situation. The truck quit on me one night coming to work. About four retries to start it started. I go to leave the next morning and it starts fine. About 3 mins later it dies to not restart even after tapping on the tank etc. Had a mechanic come get it on the rollback. It starts and runs for him with no problems. I get it and drive it daily for about 10 days to l it quit on me again about 2 miles from home. After about 10 mins of trying to restart it finally restarts, gets me home and to the shop about 25 miles away. Mechanic replaces the pump(just the pump from autozine) runs for a couple of mins and then starts cutting up. The fuel pump harness had a short in it which in turn got a coil pack. Coil fires pump through a relay back to the coil( I think I am not sure). Cost me $410 : pump $275, coil pack $75.
     
  10. Jan 20, 2013 at 9:57 AM
    #10
    4WD

    4WD cRaZy oLdmAn

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    An almost foolproof way to check for a fuel delivery problem (or at least rule out) for starting problems is get a can of starting fluid & give a couple good healthy squirts into the intake of air filter, then hit the key if it fires up for a bit, then you can almost be sure its a fuel pump/or clogged filter.

    It'll def. be somewhere in the delivery system & not ignition related
     
  11. Jan 20, 2013 at 11:28 AM
    #11
    tomboy75

    tomboy75 Member

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    I was thinking the tacomas have a lifetime fuel filter or at least won't plug completely.
     
  12. Jan 20, 2013 at 11:55 AM
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    SigBur

    SigBur [OP] Active Member

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    Hah, yep Durango still is the same, although I'm out in Big Sur, California now; 1.5 hours from anywhere with auto parts so I've gotta make my town runs productive. Which reminds me, I've started keeping 15 gallons of fuel in three plastic cans on standby and use it within a week or two. Just filled up with two of them before this issue arose. Coincidence?

    I'll try the starter fluid and rule out any ignition problems. It seems Denso is the pump of choice, any other good choices?
     
  13. Jan 20, 2013 at 2:12 PM
    #13
    4WD

    4WD cRaZy oLdmAn

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    No they're replaceable....but even if not completely clogged ya gotta remember that we're EFI & that requires a constant,minimum line pressure at all times, (even when engine off theres pressure..)




    Hmmm, interesting is there a chance water got inside ??
     
  14. Jan 20, 2013 at 5:18 PM
    #14
    BamaToy1997

    BamaToy1997 Wheel Bearing Master

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    Sorry, but part of your info is incorrect. The injectors are fired based on the input signals from the crankshaft and camshaft sensors. So if you had a problem with either of them, you could still run it off a can of starter fluid.

    Of course obviously with the OP, his problem IS a fuel pump. Just wanted to make sure you didn't misdiagnose a fuel pump simply because it started off a can of starter fluid. :D
     
  15. Jan 20, 2013 at 8:27 PM
    #15
    4WD

    4WD cRaZy oLdmAn

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    So if the injectors are fired from a sensor signal does this mean the term "fire" is the same as opening/closing the injector ? (I'm assuming it has to open at some point to enter fuel into combustion chamber) & if so, if they were to fail , do they fail in the open position or closed ?
     
  16. Jan 23, 2013 at 11:00 AM
    #16
    BamaToy1997

    BamaToy1997 Wheel Bearing Master

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    Fuel injectors are a spring loaded, naturally closed solenoid. In almost all cases when an injector fails, it fails in the closed position. I have only seen one or two cases otherwise, and those were stuck open because of trash in the fuel blocking the pintle from closing.

    Yes, when I say "Fired" I mean they are energized and opened up to allow fuel to flow. The camshaft sensor is what is used to time the injectors, because the crankshaft rotates 2 times for a full cycle, but the camshaft only rotates once. The computer uses both signals to verify proper injection timing however. The camshaft has a single tab on it that tells the computer that the engine has reached the proper point for the #1 injector to fire. After that the computer uses the crankshaft sensor signal to time the EXACT firing of the injectors, and uses the camshaft sensor at that point to simply verify each time the engine reaches #1 sequence.
     

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