Fuel Filter
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500, 472, 425, 368 Discussion, Fuel Filter in Cadillac Engine Technical Discussion; Sorry about the repeat. I accidently posted this in the electrical section. I was looking for my fuel filter and ...
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    MMNineInchNails's Avatar
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    Fuel Filter

    Sorry about the repeat. I accidently posted this in the electrical section. I was looking for my fuel filter and cant find it. Is it built into the side of the carb?

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    lux hauler is offline Cadillac Owners Connoisseur
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    If it's a Q-Jet carb, it's right in the front of the carb where the fuel line attaches.
    Here's a picture. The circle is around the filter housing.
    Attached Images

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    That's where i thought it was if it weren't hidden somewhere else. Damn fuel lines in the way so i can't get open that part. I'll have to take off the carb or something.

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    Re: Fuel Filter

    1" line wrench on the filter housing, and a 5/8" line wrench on the fuel line breaks it loose. Then pull fuel line out of the way (it's tight but it CAN be done) and unscrew the filter housing. Be careful not to lose the spring behind the filter or (and this is IMPORTANT) the thin plastic seal that goes around the end of the filter housing (this is the only actual seal for the housing). The seal "clicks" in place on the end of the housing.
    IMPORTANT TIP: DO NOT USE TEFLON TAPE ON ANY OF THE THREADS. (line or housing)

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    Is it bad if there is no spring in there? What will it do with no spring? I pulled it off and there was no spring inside.

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    Re: Fuel Filter

    Quote Originally Posted by MMNineInchNails
    Is it bad if there is no spring in there? What will it do with no spring? I pulled it off and there was no spring inside.
    lol who cares? While you have it off put on a Holley or an Edelbrock!

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    Re: Fuel Filter

    Quote Originally Posted by 2dfx
    lol who cares? While you have it off put on a Holley or an Edelbrock!
    I'd love to. Do you have the money to buy me a edelbrock 750cfm?? cause I sure don't....

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    Re: Fuel Filter

    BS!
    The Q-Jet is great when you know how to set it up.
    And YES, it DOES matter about the spring missing. That's what keeps the filter seated against the housing. Without the spring, you get no filtering.

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    Looks like I'm going for the universal one seen in the link below. I'm not going to waste any money on a new filter if it wont work.

    http://www.partsamerica.com/PartDeta...egoryCode=3336

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    Re: Fuel Filter

    Not sure what you meant by universal one but you COULD just install an inline one and it would actually do a better job.

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    Anyone know the cfm output of a q-jet off the top of your head? Just curious.

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    Re: Fuel Filter

    Quote Originally Posted by Katshot
    Not sure what you meant by universal one but you COULD just install an inline one and it would actually do a better job.
    universal as in the one that i made a link to. They call it "universal" at least.

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    Re: Fuel Filter

    Quote Originally Posted by MMNineInchNails
    universal as in the one that i made a link to. They call it "universal" at least.
    I don't know if you CHECKED your link but it only takes you to the Parts America home page.

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    Re: Fuel Filter

    Quote Originally Posted by davesdeville
    Anyone know the cfm output of a q-jet off the top of your head? Just curious.
    There were different size Q-jets.

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    Re: Fuel Filter

    Just wanted to add to that post about the Q-Jet airflow ratings. I had to wait until I got to work to look up the exact sizes.

    There are 2:
    1-3/32" venturi (primary) = 750cfm
    1-7/32" Venturi (primary) = 800cfm
    As I recall, your car has the larger one but a simple measurment can nail it down for you.

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