Dominator floods when hot?

Discussion in 'Holley' started by BUICKRAT, Apr 12, 2014.

  1. BUICKRAT

    BUICKRAT Torque Rules!

    OK, brand new 1050 last year, put on 2k miles without a hitch. This year, when it gets a hot soak, the front bowl starts to flood...badly. Dumps fuel, enough to kill the motor instantly. Took the front bowl off today, float moves freely, no varnish inside it, cleaned the air bleeds. My gut says replace needle and seat, anyone run into this issue before? Thanks in advance. BTW, only does it when hot.
     
  2. DEADMANSCURVE

    DEADMANSCURVE my first word : truck

    mud wasp nest in front bowl vent ? hows that for a guess ?
    yeah for sure I'd try the needle/seat . do you run a pressure regulator ? could the heat affect that and maybe let the pressure just jump up ? but that seems like it would flood front and rear . is it flooding from the vent or booster or shooter ? sounds like a lot of gas like out of the vent .
     
  3. BUICKRAT

    BUICKRAT Torque Rules!

    Can't tell where its coming from, I don't dare run it with the air cleaner off for fear of fuel running onto hot engine...

    No mud wasps...

    Called the holley tech line, guy said most likely fuel is percolating, recommends a phenolic spacer. Evidently, winter blend fuel is much more prone to this, butane is added to it to help it evaporate in cold weather, and we are still pumping winter blend here in NH. Last time it happened, the front bowl was significantly warmer than the rear as it sits closer to the intake.

    Thoughts?
     
  4. DEADMANSCURVE

    DEADMANSCURVE my first word : truck

    hmm - the winter fuel thing is interesting . a spacer and a heat shield under carb might be worth a try . especially since its a "just hot" situation . I was thinking a couple other ways but they would have happened all the time ( missing or loose jet , very obvious - bad super blown out power valve situation allowing gas to get behind power valve if possible and down into intake ? ) .
    a fuel perc flood would , I would guess , have to come out of the vent - what if you removed the air cleaner and clamped a section of 5/16" gas hose to front vent if possible and run it down under car a little , start er up and see what happens . could even take an old air cleaner lid , drill a hole in it and run the hose outa that so you might not have to worry about a flash . clear hose might work real good ?
    and of course dif gas . but it may be a good idea to be able to duplicate problem THEN switch gas .
     
  5. DaWildcat

    DaWildcat Platinum Level Contributor

    The winter fuel was my first thought too, but if that was the cause, I think you'd be seeing issues with both the front and rear bowls.

    Do you have brass floats, or phenolic (plastic)?

    Devon
     
  6. BUICKRAT

    BUICKRAT Torque Rules!

    Its got phenolic floats. The front bowl get much warmer than the rear one due to proximity to the intake and rad cooling fan. Rear bowl sits away from intake due to runner design. I'm hoping a spacer fixes it, but it sucks cause now I will need new throttle cable bracket (100 bucks) and air cleaner assembly (100 bucks). Oh well, easy come easy go, so they say.
     
  7. DaWildcat

    DaWildcat Platinum Level Contributor

    Summer (warm weather) gasoline is on its way to Michigan now, not sure about NH.

    Devon
     
  8. BUICKRAT

    BUICKRAT Torque Rules!

    May 1 is our deadline in NH. Gonna call my supplier and see what they can tell me. I'd sure like to be able to just leave it alone.
     
  9. DaWildcat

    DaWildcat Platinum Level Contributor

    If you have a few gallons of gasoline in cans sitting around for a lawn mower or snow blower from this winter or last summer, you can do an early test. The most volatile part of the gasoline will already be long gone, and it'll run just fine. Just don't do any full throttle runs on the stuff, especially if it's a year old or more.

    Devon
     
  10. BUICKRAT

    BUICKRAT Torque Rules!

    OK, you guys will love this. Winter blend "usually" ends approx. the third week of April, but they will not notify us in advance because it will cause a huge spike in dealer demand right before the switch as summer blend is about 5 cents more per gallon. Geez! Wish they had an additive to raise the evaporation point....Devon?!...where are you?! You da engineer!!
     
  11. BUICKRAT

    BUICKRAT Torque Rules!

    AH HAA! You a step ahead of me. So the butane evaporates before the gas...?
     
  12. DaWildcat

    DaWildcat Platinum Level Contributor

    There's more to it than just Butane content, but yes, the winter gasoline is more volatile and messes things up in warm weather.

    Suffice to say that every autumn I can count on hearing complaints from my Ford, GM, Chrysler assembly plant customers saying "hey, you have a problem with your fill pipe, get in here". I would get there and every person with a piece of fuel system responsibility would be there too. Spit-back during the fill event was the complaint. They keep complaining because they are force-filling with winter formulated fuel in a 80 F environment at the assembly plant for the first time each year.

    A few plants have installed fuel coolers called "chillers" so they can speed up the assembly line no matter the fuel formulation. The plants that haven't still call every Fall wondering what's up.

    Sorry, probably more than you wanted to know.

    Devon
     
  13. TORQUED455

    TORQUED455 Well-Known Member

    Interesting stuff.
     
  14. BUICKRAT

    BUICKRAT Torque Rules!

    Not at all, just what I wanted to know, as a matter of fact. It explains many of the evaporative emissions system faults I see in the fall. Spit back being #1 as I own a Mobil gas station,("there's something wrong with your pumps, mister, this thing just splashed me"), fuel tank pressure sensor and vent valve codes etc, depending on where they fueled up and what fuel they got. Thanks, Devon.:TU:
     

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