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Thread: fuel pump constantly runs

  1. #16

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    You haz no gifts, you do now. lolz - rascal Thanks for your help! - Big Mizz 

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    What about the ccrm?
    Found the limits of factory internals. Pictures here.

    2000 ZX2 - Built engine (Eagle Rods, JE Pistons, block bored to 85.5mm, 2mm oversize valves, Forged oil pump gears), Garrett GTX2863R turbo, 80 lb/hr injectors, flex fuel, Megasquirt 3 EMS, Celica ST185 radiator, 3" exhaust. Other mods too, check out my build thread for a full listing.



    "I usually downshift when I'm near a Prius so they can hear me hurting the environment"

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  2. #17

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    So I laughed out loud when I read that unplugging the O2 sensor stopped the pump from running. I didn't believe it, but then I tried it too, and I'll be damned unplugging either 02 sensor stops the pump from running.

    Was there ever a resolution to this thread? I'm in the same boat and it's making me insane.

    Bit more detail
    disconnect battery cable
    connect cable and CCM starts clicking away and fuel pump runs
    eventually CCM stops clicking (2min?)
    fuel pump keeps running
    turn on ignition
    fuel pump stops running
    start car (at least that works)
    turn car off
    fuel pump keeps running
    turn on ignition
    fuel pump keeps running

  3. #18

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    So I neglected to mention.... from PO the main 100Amp fuse was blown (easy fix), the heater core leaked like a sieve (not as easy, but fixed), and the shift linkage shaft for the manual transmission was rusted into two parts (fixed with some help from my local muffler shop welder).

    Per AllData I tested the resistance for the O2 sensor leads. two of them were below 10K ohms, so I knew I had a short somewhere.

    After pouring through AllData electrical diagrams I finally landed on a common connection for both O2 sensors. Connector #10 which is right under the heater core (uh oh).

    I pulled that connector apart and it was still wet and corroded from all the coolant that was allowed to leak onto it. There is my short. Damn.

    Cleaned them up, blew them out with air gun, reassembled and MAGIC. No more running fuel pump.

    Hope all that helps somebody in the future.

    I still need to replace the alternator, I suspect due to whatever took out the main fuse. But that isn't going to make me lose mind.

  4. #19

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    No more running fuel pump but the short fried the O2 heater circuit in the PCM/EEC, so now I need to source a replacement VWK0. (anybody have one laying around?)

  5. #20

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    depending on what year your car is you can use multiple computers. You don't have to just use a VWK0.
    99 Escort sedan - Aquamarine frost metallic, 5-speed.
    99 Escort wagon - Zetec swap - Atlantic blue, automatic.
    01 Mustang Cobra - silver, 5-speed. mods.

  6. #21

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    Understood, there are multiple options for the computers. This is for a 2000 with a manual transmission. As far as I can tell it is the model with zero factory options (well, maybe Power Steering)

  7. #22

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    Any computer from a 2000-2003 (and some 1999s will fit too)will work as long as it's a manual transmission.

    power options like windows and whatnot don't affect the computer at all.

  8. #23

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    Replaced the computer and all is well.

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