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Thread: '77 Seville In-Tank Fuel Pump Module replacement (complete) -- or "Go Fish" ???

  1. #1
    MAD JAX is offline Cadillac Owners Member
    Automobile(s): '77 Seville (I like '67 - '75 Eldorados ; )
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    '77 Seville In-Tank Fuel Pump Module replacement (complete) -- or "Go Fish" ???

    I'm having a helluva time finding a COMPLETE In-Tank Fuel Pump Module that includes the Fuel Level Sensor, etc. so I joined this forum to find some help...

    I'm helping an old friend get his '77 Seville up 'n running that's been down nearly a decade, and have removed the tank for cleaning and sealing while I clean and replaced the fuel system lines and source replacements of BOTH Fuel Pumps (In-Tank and "Frame Mounted") as both are seized-up.

    I'm hoping I don't have to try salvaging the Level Sensor Module that was in there, as it's pretty well corroded with rust, etc., for the presence of contaminated/stale fuel...the Fuel Level Sensor is apparently shorted to ground for indicating a perpetually "Full" tank.

    Anyone know of a source for either N.O.S. parts or viable replacement parts?

    Otherwise, the system operating pressure is 39 psi....surely there's a replacement pump available from another application that'd install directly and work at or about that pressure, or what do You know?

    I've tried searching the forum to no-avail, but if there's a link or thread I've missed you know of please reply, your considerations would be greatly appreciated, thank you!

    Jack Gleason Mobile Automotive Diagnosis aka "MAD JAX"

    "Impossible" is a degree of difficulty...set by imagination for lack of motivation.


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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: '77 Seville In-Tank Fuel Pump Module replacement (complete) -- or "Go Fish" ???

    Talk to Chris in parts at Rippy Cadillac over there >>> or up ^^^ in Vendors

    Same for Luke at Lindsay Cadillac >>> or ^^^

    Look at the pics by clicking on the icons in www.rockauto.com (if they have '77 parts)

  4. #3
    MAD JAX is offline Cadillac Owners Member
    Automobile(s): '77 Seville (I like '67 - '75 Eldorados ; )
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    MAD JAX & "Creating Jobs" ; )

    Thanks for the leads, but both dealerships referred me elsewhere -- essentially saying "Go-Fish" -- to places leading where I already was...Improvise, Adapt, and Overcome unless you can find what you need "Used" for a reasonable price...and the latter sure isn't happening!

    An In-Tank Pump Module using a similar analog sender that produces 37 - 44 psi. (with 3/8" Send, 5/16" Return, and 1/4" Vapor lines) that has what appears to be a standard Fuel Tank Sender opening, and -- even if I had to shorten or lengthen the lines and wiring -- it would work, one could eliminate the frame-rail pump altogether, and -- especially if that PN's application was really popular -- someone could probably make a mint selling them as replacements!

    We could collaborate on this, market it from this websites "Classifieds", and contribute 15% of all sales-profits to the site...I'll provide the "Guinea Pig" for R&D, So, Who's "In" : ?

  5. #4
    MAD JAX is offline Cadillac Owners Member
    Automobile(s): '77 Seville (I like '67 - '75 Eldorados ; )
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    Re: MAD JAX & "Creating Jobs" ; )

    I've got the Tank being douched 'n sealed, rebuilt the Frame Mounted Pump (and verified it's Operation), and aquired the In-Tank Pump "Sending Unit Module" from a '82 Seville to which I'll be mounting "Todays Exchange Application" of a '77 Seville In-Tank Fuel Pump...based on what diagnosis has been performed so-far, if the Injectors aren't clogged-up and the Fuel Pressure Regulator functions correctly it should start 'n run once I get it all back together.

    Identify, define, improvise, adapt, overcome...I guess we'll see here quick!

    WTF...just got a msg. from the Radiator Shop douchin' the Tank saying "Call me ASAP"...NOW what's up : ?

  6. #5
    MAD JAX is offline Cadillac Owners Member
    Automobile(s): '77 Seville (I like '67 - '75 Eldorados ; )
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    Re: '77 Seville In-Tank Fuel Pump Module replacement (complete) -- or "Go Fish" ???

    Well it's been quite awhile since that job was completed ~ Just for Grins:

    After getting the Tank douched 'n sealed, the Frame-Rail Pump Rebuilt, an '82 Seville "Complete in-tank pump-module" (with some minor modification(s) installed, ALL the injectors rebuilt, the pressure-regulator replaced, and the entire fuel-system back-flushed-clean ~ that Caddy fired-up and ran great!

  7. #6
    carnut is offline Cadillac Owners Master
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    Re: '77 Seville In-Tank Fuel Pump Module replacement (complete) -- or "Go Fish" ???

    Better late than never! thanks!


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