Fuel shot out the float bowl vent tube.....

[Sledge]

After I reinstalled the primary and secondary fuel bowls on my 4150 HP-based carb, I turned the fuel pump on to check for leaks. No leaks from either, other than gas shooting out the secondary bowl vent tube. So I took the bowl off, checked the float for operation, made sure the float was clearing the jet extensions, reinstalled, and the same thing happened. So I took it off for a third time. Same thing happened. With no other options I could think of, I opened and closed the throttle all the way and the gas stopped shooting through the tube.

Is this a unique experience or has it happened to others? I'm--clearly--no Carb expert, so I don't understand how the throttle movement got the float needle to seat (apparently) and shut off the flow of fuel.

Thx

[CobraEd]

If you are using an electric fuel pump made for fuel injection, the presure will be too high and force open the float. You need a pump made for a carb that has a max of 7 psi. An FI pump is about 15 psi.


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[lovehamr]

The culprit was most likely junk in the secondary needle and seat. This is of course assuming that the rest of the fuel system had remained the same.

[CobraEd]

I agree. If this setup worked before, (which I did not realize), then it is probably junk in the line broken loose from fooling with it.


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