gas in my oil
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gas in my oil

  1. #1
    Junior Member FASTBOATNUT's Avatar
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    Default gas in my oil

    Ok I have got the boat running good on the trailer and took it out last night took off and it stumbled @ take off got the rpms up and ran great everytime I stop and go to take off it pops back threw the carb 1 time and runs what feels like fat and then runs great! came home checked some plugs they looked good but when I checked the oil there was about a qt of gas in the oil! I only ran the boat 3 or 4 passes maybe 15 min I have a small block Ford with a 750 Holly and electric fuel pump I am thinking the fuel pump is there a way to check this without buying a new one and trying it out!
    Last edited by FASTBOATNUT; 09-15-2009 at 01:15 PM.

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  3. #2
    Wet
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    How about a fuel pressure regulator and check your float settings.

  4. #3
    Junior Member FASTBOATNUT's Avatar
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    Pressure is @ 7lbs float level is ok thanks for the reply

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    Senior Member GT Jets's Avatar
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    It sounds like a power valve function or sizing issue to me. I would pull the power valve and install a fresh one just for S&G...With a SBF I would ball park a 6.5, but check the charts...

    With a large (assume mechanical secondary) carb the tune needs to be pretty close on a smaller displacement engine...

    Places to start;
    Jetting
    Venturi sizes
    Accelerator pump diaphram sizes (don't forget squirters)
    Power valve rate
    Check for the proper gaskets when pulling it apart (this one will get you too)..

    Good luck! BTW 7# sounds OK as long as you're sure its accurate (check with another gauge)...May even consider dropping to 6 to see what happens.

    GT
    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    i agree with GT on what to check, but IMO, unless the motor is "built", ur way over carbureted!...a 700/750 DP would be a much better choice, especially if its "just" a cruiser!...thats alot of gas to put into a small c.i. motor & excess from that sz carb could be getting into the oil if its not perfect...just my .02 cents

    FastRat

    p.s. remember, "Bigger" is not always better!!!!

  8. #6
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    Torn PV or just overcarbed would be my guess.

  9. #7
    Junior Member FASTBOATNUT's Avatar
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    Ok I replaced the PV and rejetted the carb the plugs look good! it is a Ford 366 10.5:1 dyno @ 390 HP I am running 68 and 72 jets thanks for the feedback

  10. #8
    Junior Member FASTBOATNUT's Avatar
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    No luck any more ideas???

  11. #9
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    just confirming. You said electric fuel pump on first post.. Is that correct?
    Is it just me or are toilet seats getting smaller?

  12. #10
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    i hate to answer a question with a question but how do you get a qt of gas in your oil with a electric pump? was fuel running out the overflows in the carb? would leave me to believe that fuel level was wrong or overpowering the needle and seat or something was stuck in one of them and overflowed. i would start engine without running the fuel pump by pumping the gas, fuel accelerators pumps will prime engine well for cold start and once it's fired then turn on pump, you could even wire the pump to a oil pressure switch so only when the engine is running would it turn on the pump.

    since you said it ran on the dyno well leads me to believe that it is something that came after your dyno test?

    electric pumps dont pull very well from tank so filter should be after electric pump as close to carb as possible with reg being the last thing before fuel enters carb. i like around 5 lb @ wot for a lake boat

    good luck and how about some pics.

  13. #11
    Senior Member Ronboats's Avatar
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    I agree with Havasubyou about the possability of the pump overpowering the floats, or a peice of dirt from your tank could have stuck the needle open. Actually, The only way I can see getting that much gas in your oil is if it happened BEFORE you started it. If you turned on the key and didn't start it right away, with a stuck needle it could have pumped in a lot of gas and it ran past your rings. I don't see how it could have happened while it was running- you didn't run it that long. At any rate, I'd turn on the key without starting the engine and watch the carb bowl vents to make sure they are not overflowing into the engine.

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