Big Block Chevy Help
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Big Block Chevy Help

  1. #1
    Junior Member
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    Default Big Block Chevy Help

    I need to get pointed in the right direction. We took the boat out to Shasta Saturday. It did great all day except for one issue that came up 4 or 5 hours in.



    Cruising at 3000 to 3500 RPM everything was fine. As soon as I tried to accelerate up over 4000 RPM the engine would cut out almost like it was running out of gas. I showed a 1/4 tank which is the lowest I have been but figured I should top off at Holiday Harbor. Once filled up we started up the McCloud arm and again when I throttled up the engine would cut out at around 4000 RPM. We finished our day and made the run back to Jones Valley where it would cut out at times when pushing up to 4000 RPM and at times would run WOT.



    Where should I start? It's a stock marine 427 BBC with a stock Quadrajet fed by an oem manual fuel pump. Fuel filter was changed about 15 hours ago.

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  3. #2
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    If I remember correctly, There is a fuel filter inside of the carb where the fuel inlet is. It takes very little to clog these.

  4. #3
    Senior Member Sanger-Spectra's Avatar
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    I was thinking the same thing, check filters and possibly fuel lines, could be collapsing on you.

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  6. #4
    Senior Member nosfomoco's Avatar
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    Funny was thinking same, I used a buddies truck (1976 square body Chevy 4x4 ) to tow my boat up to Shasta about 15 years ago, truck did great for first hour then ot would barely do 55 mph and couldn't even touch the secondaries on the Quadra jet. Ended stopping twice to try and fix it, ended up being a slightly clogged filter , the fuel filter that's at the carburetor inlet. I would start there.

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    1978 Eliminator Sport Cruiser 20.5ft BBF 460!

  7. #5
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    Great info guys. I will check both filters.

  8. #6
    riverside brawny's Avatar
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    also while you're looking check fuel lines-are they soft or spongy?
    vent lines from tank-clogged?
    weak fuel pump?
    float levels stuck or to low?

  9. #7
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    Quote Originally Posted by brawny View Post
    also while you're looking check fuel lines-are they soft or spongy?
    vent lines from tank-clogged?
    weak fuel pump?
    float levels stuck or to low?
    I will check all the fuel line and vent line. I'm going to have to figure out how to test the fuel pump and also freshen up on the workings of a carb. I will start with the filters and line inspection. Get the easy stuff done.

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