Leaky Fuel Valve Seat

[patrickt]

Originally Posted by N2Cobras

After searching for this issue, I didn’t find anything on this screw loosening, so my questions are:
1) Does anyone have experience of this screw loosening on their Holley 4 bbl(s) and what did you do?
2) Should I just get new gaskets for the fuel valve screws and replace them proactively or wait to see if it fails/ loosens again?
3) When should the carb be rebuilt? It seems to be running well for the 2k miles I put on it the first year I’ve had the Cobra but I haven’t pulled the plugs yet to see how they are burning, it’s on my to do list at the first of the year. I have no documentation that a carb rebuild has been done on car.

The screw on the needle/seat does not normally back off. And remember that the top of the bowl is not completely under gas either. I would pop the bowl off, change out the needle/seat on that bowl, replace the little o-ring, and if you still experience gas coming out suspect a crack in the fitting. If you set the float so that the gas is right below the sight hole it's likely gas will dribble out the boosters when hot, so you might have to set it a little lower. Those Holley instructions are 60 years old now.