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Old 10-15-2006, 12:10 PM
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Holley Needle And Seat

I have a Holley 750 double pumper which is giving me a little trouble latley. Seem like there is fuel pouring out of the front air vent, so I'm thinking there is some dirt in the needle and seat assembly. So I took out the n&s and let it soak in a jar of gasoline for a while (shaking it of course). When I went to put it back it the carb the problem was still there. How can I tell if it the needle and seat or something else?

I would buy another needle and seat but I'm try to give this one another life

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Old 10-15-2006, 12:19 PM
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Holley Needle and Seat

I've had this problem before on racing engines. The problem may not lie with the needle and seat. With mine I had problems with the floats sticking and flooding the engine out, sometimes blowing the fire out, and other times causing it to idle at 3000 revs. Sometimes a good tap on the floatbowl while the carb is assembled can free up the floats. Other times you may have to tear it down and clean the pivot points as best you can with berrymans in a spray can. Ah, I've also had a float develop a hole in the solder joint, causing the float to fill up with fuel and sink to the bottom of the bowl, theryby flooding the bowl. Try this, crank the starter long enough to fill the bowls, have a small catch can ready, and pull the sight plug from the troublesome bowl. If you get a torrent of fuel, adjust your float level down and try again. If these adjustments don't work, tear down and investigate. Hope I could help.

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Old 10-15-2006, 05:18 PM
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It's possible your float has a crack, hole, or split solder joint which allows it to fill with fuel and sink.

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Old 10-15-2006, 11:04 PM
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All of the above, but you didn't mention removing the site plug and resetting the needle when putting it back in. You need to screw it in and then set the level at the bottom of the site plug hole. If this can't be done, then you need to investigate more as mentioned above.
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Old 10-16-2006, 01:23 PM
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Make sure the flaot isn't hitting the bowl on hte inside. The front and rear bowls may not be the same if one has a metering plate and other a block.
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