pump and clunk
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Cadillac Seville / Cadillac Eldorado Forum Discussion, pump and clunk in Past Cadillac Vehicle Discussion; I have a 1970 eldo it's previously been sat for a few years- the windscreen sticker says last test ran ...
  1. #1
    Captain wow's Avatar
    Captain wow is offline Cadillac Owners Member
    Automobile(s): 1970 Eldorado (prev:78Eldo-73Eldo-79CDV-78Sev-79Sev)
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    pump and clunk

    I have a 1970 eldo it's previously been sat for a few years- the
    windscreen sticker says last test ran out 06-06.
    I have had it for two months, driven it about a week. I've done a shed
    load of work and now have a couple of things that I'm not sure of.

    Firstly it had an electric fuel pump and filter mounted on the wheel
    arch just behind the battery. I have just replaced this recently with
    a 6psi carter vane-type pump. Seems to work well but when I drive
    up a very slight incline at about 10-15 mph the engine almost imediatly
    fades and stops as if run out of fuel. I turn the ign off, pump gas,
    and for the first few key turns i have no starter!? Then on fourth try
    it's all back and I carry on. Any ideas?, I expected it was due to the
    pump being mounted too high and far from the fuel tank but it happened
    with a full tank of fuel today. And why do I lose the starter motor
    briefly?

    Ok secondly - I got a clunk, usually when manouvering to parkup. It's
    from the front right around the torsion bar block. When I reverse
    then brake:CLUNK! then I go foward and brake :CLUNK! or sometimes
    the clunk happens when i put it in drive or reverse. The only thing I
    see worn under there are perished control arm bushings. And a small
    split on a sway bar bushing. Could it be the actual torsion bar? If so
    what exactly is on the end of it that would clunk?

    btw does anyone think it would be useful if 67 -79 eldos had a seperate forum?

    Cheers

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  3. #2
    00 Deville's Avatar
    00 Deville is offline Cadillac Owners Connoisseur
    Automobile(s): 02 Deville / 04 Deville
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    Re: pump and clunk

    You need to attach a fuel pressure gauge with a long hose on it and tape the gauge to the windscreen. Then go drive up a hill while monitoring the pressure gauge to watch for a drop in pressure.

  4. #3
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: pump and clunk

    Did they go to electric fuel pumps by 1970?

  5. #4
    Captain wow's Avatar
    Captain wow is offline Cadillac Owners Member
    Automobile(s): 1970 Eldorado (prev:78Eldo-73Eldo-79CDV-78Sev-79Sev)
    Join Date
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    Location
    Bristol, UK
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    Re: pump and clunk

    It originally would have had a mechanical pump but when i got the car it had a basic electric pump installed which i replaced as it was cutting out and had a spring loose inside so i presumed it was this that caused the problem.

  6. #5
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: pump and clunk

    That's what I thought. That may be your problem. I'd go back to a mechanical pump.

  7. #6
    Captain wow's Avatar
    Captain wow is offline Cadillac Owners Member
    Automobile(s): 1970 Eldorado (prev:78Eldo-73Eldo-79CDV-78Sev-79Sev)
    Join Date
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    Bristol, UK
    Posts
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    Re: pump and clunk

    id rather keep the electric pump as i dont know what troubles are connected to the original setup. plus like i say it seems to work fine aside from this problem!
    Also in the near future i hope to fit an LPG sytem and i'd need an electronic shut off for the petrol line.

  8. #7
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: pump and clunk

    Then maybe you need a stronger pump.

  9. #8
    Captain wow's Avatar
    Captain wow is offline Cadillac Owners Member
    Automobile(s): 1970 Eldorado (prev:78Eldo-73Eldo-79CDV-78Sev-79Sev)
    Join Date
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    Location
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    Re: pump and clunk

    Hi, i sorted the petrol problem. I moved the new Carter electric fuel pump to the rear just to the right of the tank, its now as low and as close to the tank as possible and works a treat.
    Im still having a problem locating the CLUNK though, can someone tell me where the engine and transmission mounts are located so i can check them. Thanks

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