80 dev. fuel filter
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500, 472, 425, 368 Discussion, 80 dev. fuel filter in Cadillac Engine Technical Discussion; Need some help, I want to put a new fuel filter in 1980 deville, 368, it's right in the carb ...
  1. #1
    creeker is offline Cadillac Owners Connoisseur
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    80 dev. fuel filter

    Need some help, I want to put a new fuel filter in 1980 deville, 368, it's right in the carb body, and involves two wrenchs to remove old one. one of the wrenches is a 15/16" , the other wrench ( to remove fuel line) is somewhere around a 9/16, 1/2, or ??. one is too small and the other is sloppy and might round soft nut. does anyone know actual size?. tkanks.

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    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: 80 dev. fuel filter

    It's a 5/8" nut. 16 mm will work fine also. You should use a tubing wrench for the job. Sometimes a tubing wrench can be forced onto rounded nuts by rocking it while applying a lot of pressure.

  4. #3
    creeker is offline Cadillac Owners Connoisseur
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    Re: 80 dev. fuel filter

    Thank you , knowing what to use is half the battle.

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    JTraik is offline Cadillac Owners Enthusiast
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    Re: 80 dev. fuel filter

    Does that filter serve as an auxillary? I know the q-jets on the BBC's (any engine for that matter) have either a paper filter or a mesh filter. My '68 has a mesh filter with a large primary filter under the pump... Do the q-jets with a paper filter also have a large primary?

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    creeker is offline Cadillac Owners Connoisseur
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    Re: 80 dev. fuel filter

    I have only owned car for a month, but as far as I can find out it only has the one filter, it is quite small , approx. 1/2" dia. by 3" long. with a built in "check valve". I also bought an inline filter that I will install sometime.
    tnx. for reply

  7. #6
    cadder2000 is offline Cadillac Owners Member
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    Re: 80 dev. fuel filter

    Check the frame rail about 3/4 of the way back, on the drivers side. There should be a bigger primary one.

  8. #7
    creeker is offline Cadillac Owners Connoisseur
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    Re: 80 dev. fuel filter

    Cadder 2000, tnx. for the tip,would it look like an inline filter ? is it a factory installed item?. tnx. ken

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    The Ape Man's Avatar
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    Re: 80 dev. fuel filter

    You won't find a fuel filter on the frame rail of a carburated 1980 Cadillac unless someone modified it. You might be thinking of the fuel injected models.
    The filter in the fuel pump isn't there on later models either.

  10. #9
    creeker is offline Cadillac Owners Connoisseur
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    Re: 80 dev. fuel filter

    yes , my car has a carburetor, so I guess there's just the one filter in the carb. and none on the frame.

  11. #10
    JTraik is offline Cadillac Owners Enthusiast
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    Re: 80 dev. fuel filter

    Quote Originally Posted by The Ape Man
    You won't find a fuel filter on the frame rail of a carburated 1980 Cadillac unless someone modified it. You might be thinking of the fuel injected models.
    The filter in the fuel pump isn't there on later models either.
    Well mine is in-line but right under the pump. Its a stock setup as i have seen it in my manual.

  12. #11
    The Ape Man's Avatar
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    Re: 80 dev. fuel filter

    Quote Originally Posted by JTraik
    Well mine is in-line but right under the pump. Its a stock setup as i have seen it in my manual.
    The older cars had a filter right in the pump. Later ones I've seen didn't use that filter. Some had both filters.

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