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carb question

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    Senior Member californiadreamin's Avatar
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    Hey guys...holley 3310-1 780 cfm dual metering blocks vacuum secondary...it doesn't have idle mixture screws on the secondaries so my question is does it have an idle circuit in the secondary?

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    Quote Originally Posted by californiadreamin View Post
    Hey guys...holley 3310-1 780 cfm dual metering blocks vacuum secondary...it doesn't have idle mixture screws on the secondaries so my question is does it have an idle circuit in the secondary?
    Yes.
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    gn7
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    If it didn't, on a street vehicle, the fuel it that bowl would turn to chit after awhile, if the secondaries weren't used for a long period.



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    Senior Member californiadreamin's Avatar
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    Got it thanks guys. So this is what im wondering....I've been trying to get one of my tanks clean and I think its pretty good but its still giving me trouble. When running on that tank I can cruise about 3k but when I get into it it stalls. It always restars right away. Im thinkin I've got a restriction coming from that tank and when I get on it it drains the primary then restarts off the secondary idle circuit. Get on it again and same deal. Only does it when running the left tank runs fine off the right tank. Sound like im on the right track?

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    Quote Originally Posted by californiadreamin View Post
    Got it thanks guys. So this is what im wondering....I've been trying to get one of my tanks clean and I think its pretty good but its still giving me trouble. When running on that tank I can cruise about 3k but when I get into it it stalls. It always restars right away. Im thinkin I've got a restriction coming from that tank and when I get on it it drains the primary then restarts off the secondary idle circuit. Get on it again and same deal. Only does it when running the left tank runs fine off the right tank. Sound like im on the right track?
    1st thing I'd look at is the fuel tank check valve. It is at the top of the stand pipe inside the tank. It is required by the CG in case the boat flips or sinks. They have been known to either clog [varnished] or stick, either way it will restrict fuel. While you have the stand pipe out check for cracks, that'll cause problems too.
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    gn7
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    Senior Member californiadreamin's Avatar
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    As far as I know it doesn't have acheck valve. There is an elbow barb fitting at the top of the tank. Which way would it check? When I flushed the tank I flushed in both directions through the pickup without trouble seemed pretty clear.

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    gn7
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    It doesn't neccesarily have to have checks. They are only there so that you don't have to shut off a tank when it goes empty. Other wise it will just suck air from the empty tank. If you have to shut off the empty tank to make it run, it probably doesn't have checks. They also keep fuel from being siphoned from a tank in the event a line becomes broken or disconnected. Not all tanks have them. The biggest causes of tank issues are blocked vents, restricted or blocked feed lines, and leaks in the lines that allow air to get sucked in. Does this only happen when the other tank is empty. Or will it do it when the other tanks still has full in it, but is shut off.



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  11. #9
    Senior Member californiadreamin's Avatar
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    Both tanks have fuel. I have a solenoid valve to to switch between tanks. Runs fine off the right tank...I can cruise about 3k on the left tank until I stand on it then it dies a couple seconds later. All the fuel line bbetween the left tank and the and the motorand through the valve is all clear. It seems to be plugging up at the pickup. I just looked and there is a bunch of sediment that broke up from chunks that were were stuck to the tank. I think the sediment is accumulating at the pickup and causing a restriction. The vent seems fine. Its just a small notch in the filler under the flip cap.

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