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My fuel pumps are wired piggyback, is this acceptable?

This is a discussion on My fuel pumps are wired piggyback, is this acceptable? within the General Help forums, part of the LSx Technical Help Section category; Update: The job is done and car is stronger than ever!!! Im currently working on a photo post with my ...

  1. #21
    Junior Member tekkauto's Avatar
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    Mystic Teal
    1999 Formula WS6

    Update: The job is done and car is stronger than ever!!! Im currently working on a photo post with my custom mods to the fuel pump to make it work with the NEW STYLE AC Delco fuel pump (MU 1730). Supposedly this Racetronix fuel pump doesn't fit this module, but it does with a couple GM parts, a piece of rubber fuel line and a stainless steel tie strap. It took awhile to engineer a way to mount the new pump in the module but it's rock-solid. I promise this is interesting and not back-yard style! Thanks to all of you for the help.

  2. #22
    Junior Member tekkauto's Avatar
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    Mystic Teal
    1999 Formula WS6

    aae9e840-8e39-47d4-a983-3e094bdc7af3_zps35e40621.jpg
    This is where I found rotten wires---one was broken flush at the connector. More fell apart when I tried to repair roadside.

    fd011567-cda9-44ff-b72c-2107be001fe5_zpsda043431.jpg
    Nice. After I got the car to my shop and tore apart, I found a hidden fuse holder. This fuse is melted but not blown! Nice, huh

    Now this is a test to see if my uploads worked. More to come.

  3. #23
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    Black & Blue
    '02 WS.6 / '07 Suburban

    Good job!

  4. #24
    Junior Member tekkauto's Avatar
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    Mystic Teal
    1999 Formula WS6

    60ac8589-a2a3-4eb9-b184-f0e51245177a_zps90454270.jpg
    First apparent problem with Racetronix kit---fuel module bulkhead connectors were different. The top is original style and the bottom is what has been coming on replacement fuel pumps for years now. This was a new gm ac delco pump model MU 1730. I found an old pump laying around that had the old fashioned bulkhead connector. They swapped perfectly.

    c7b5eec1-26fe-4446-8c79-60b404c21c7d_zpsb0469b9c.jpg
    2nd Problem---the Racetronix pump diameter was too large to fit inside the MU 1730 so I popped out the snap ring and there was a bare Walbro inside. Now it was too small and would jiggle around inside the module housing.

    0988cb1e-813a-4796-a41e-4fcb4d8dd2a2_zps6916cf2b.jpg
    So I rounded up a new foam rubber fuel pump insulator from a GM replacment fuel pump from some 1990's vehicle. Back then they foam came installed on a new pump. I took a chunk of Goodyear transmission/fuel hose and sliced it in half. I then found some stainless steel tie straps and tensioning tool at my local farm store.

    0beba082-3f5c-4f1d-a853-377f2da3438d_zpsc3afb8d6.jpg
    Assemble like-so. Rubber hose holds the fuel pump snug to the base of the inner part of the fuel module.

    The rest of the story is the exact same as the Racetronix pump install instructions.

  5. #25
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    Black & Blue
    '02 WS.6 / '07 Suburban

    That's a lot of modification work for a "plug and play" unit. Thanks for the pics!

  6. #26
    Smiles for 9.5 Years cammed goat's Avatar
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    Phantom Black Metallic
    2004 GTO M6

    Nice job/write up.

  7. #27
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    silver
    2000 formula

    ahh............you found the instructions

  8. #28
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    silver
    2000 formula

    my install went exactly as the instructions........no mickey mousing anything.....strange

  9. #29
    Junior Member tekkauto's Avatar
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    Mystic Teal
    1999 Formula WS6

    That's because my fuel pump/module were replaced at one time. The module design is different than the original unit due to a change in the pump design and also the 4 cavity connector gets updated from a square plug to a flat 4 plug. That's common with replacement fuel pumps these days. The racetronix kit is designed only to fit the original style module.

  10. #30
    Member RONS98TA's Avatar
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    BLACK
    1998 PONTIAC TA

    Another reason to hate hackers!! They aren't just in the computer world. Nice job man, looks professionally done. Also, you now have one less worry when you want to get some more h/p's outta the LS1.

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