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Thread: Fuel In Vacuum Port - 670 Avenger

  1. #1

    Default Fuel In Vacuum Port - 670 Avenger

    I have a 670 Avenger that I rebuilt. It's a great carb, but when I take cap off of full vacuum port at base of carb, fuel comes out. What would cause this?

  2. #2

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    Bad valves. I would do a compression test.

  3. #3

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    Quote Originally Posted by Lit549 View Post
    I have a 670 Avenger that I rebuilt. It's a great carb, but when I take cap off of full vacuum port at base of carb, fuel comes out. What would cause this?
    Yeah, what he said. But if not valve related (not seating properly), timing would have to be way off, maybe a dead cylinder (bad spark plug), again timing would still have be to off to get all the way back up into the carb full vac port. I'm thinking so far off that the intake valve would have to be OPEN on compression stroke. This should be really noticeable with engine running. If not, something went wrong with the rebuild. Gasket not put on right, wrong orientation, missing gasket, something of that nature.

  4. #4

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    Did you ever find the problem? My carb is doing the same thing.

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