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Thread: No power to fuel pump (what to diagnose?)

  1. 06-01-2009, 02:02 PM #1
    eg mike
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    Default No power to fuel pump (what to diagnose?)

    I installed a full main harness in my car Saturday and after done, no power to the fuel pump.

    I tried 3 different main relays and still no luck.
    I checked Fuse 18 and its good.


    Anyone know what I should check for next?

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  2. 06-01-2009, 03:27 PM #2
    Barefoot
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    do u have power going into the main relay

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  3. 06-01-2009, 04:20 PM #3
    eg mike
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    Quote Originally Posted by no mo hondas
    do u have power going into the main relay
    Yes I got a constant hot on the white wire I believe with test light.

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  4. 06-01-2009, 04:31 PM #4
    Tech5
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    so your test light works?

    Are you trying KNOWN working Main Relays???


    Is your ignition switch working ? not the lock cylinder the electrical part?

    all your plugs firmly installed correctly and was this a used or new harness? if used did you check for cut wires,burnt,cracked,wires?

    Have you tried hitting your dash with your fist lol
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  5. 06-01-2009, 04:58 PM #5
    Barefoot
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    Quote Originally Posted by eg mike
    Yes I got a constant hot on the white wire I believe with test light.
    there has to be a fault in the new harness someplace. if u have power going out but nothing at the other end.

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  6. 06-01-2009, 05:40 PM #6
    B18c1Turboed
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    Put the pump on a seperate relay then ,use a 12v soure and toggle to trigger the main relay on.
    Attached Thumbnails Attached Thumbnails -relaywire-jpg  

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  7. 06-01-2009, 05:50 PM #7
    PURP
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    Damn, Mike. I'm having the same problem... shit's gay
    Quote Originally Posted by PURP View Post
    A g00n... is a real life thing. It walks, talks, and shits. A goblin is a fictional character that isn't real life. It's FAKE..... like rotas, y0. Hope that helps.
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  8. 06-01-2009, 05:56 PM #8
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    Check your thermostat ground - according to the schematic, that's where the relay gets its ground.

    -jonathan
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  9. 06-01-2009, 06:50 PM #9
    Z0_o6
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    Quote Originally Posted by se7en
    Check your thermostat ground - according to the schematic, that's where the relay gets its ground.

    -jonathan
    bingo. 90% of the time after swapping a harness, people miss a small ground somewhere.
    Who knows?
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  10. 06-01-2009, 09:48 PM #10
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    Quote Originally Posted by hondabuilder
    bingo. 90% of the time after swapping a harness, people miss a small ground somewhere.
    these are there for a reason' i hate electrical troubleshooting but the first thing i check is it grounded.
    Check out my for sale threads!! 15" competition speakerbox, 1TB External hard drive, and plenty of car parts!!!

    I Need some WRX, 350Z, 240SX, Really any car owner to let me do R&D for Ground Kits, Please Let me See the layouts!!!
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  11. 06-01-2009, 09:57 PM #11
    Motivation
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    he figured out the problem... Was the relay... The three he tested were all bad.
    Back to being stock and slow
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  12. 06-02-2009, 01:55 AM #12
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    Quote Originally Posted by Motivation
    he figured out the problem... Was the relay... The three he tested were all bad.
    Lol - sad... Almost typical of a Honda relay.

    -Jonathan
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  13. 06-02-2009, 08:42 AM #13
    eg mike
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    Quote Originally Posted by Motivation
    he figured out the problem... Was the relay... The three he tested were all bad.

    Yeah, I tested them on Sunday when it was like 85 degrees outside..... I re-tested last night after going through the schematic and was about to give up and tried the main relays again. Got 1 to work!

    I should of known the heat would of got to the relays! The solder on them crack from heat and its screws the connection up!

    Well coupe is running smooth, and I am excited to finish putting it back together!

    Thanks for all the comments guys!



    Purp try some other main relays :P

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