I have a 650 Holley double pumper running on the 350. I have had the car for two years now and it started to leaking gas around the shaft for the throttle plates, I think,this year. I tightened down the nuts that hold it to the intake, but no help. The car is not a daily driver, it gets stored over the winter. I need help in how to stop the gas leaks. Thanks

 

Tightening the bolts to the intake isn't going to help.

1st, are you sure that's where they're leaking?

At any rate, check that the bowl bolts are tight. Don't over-tighten them, though.

Next, check the float levels. Too high could be dumping fuel into the throats that leaks past the shafts then.

Then, check the bowl gaskets. Much more likely they're leaking than the shafts, and it's just getting back there before it runs off.

See if any of that helps.

 

It's probably not leaking around the throttle shafts..... after all, there's no fuel there, they go through the throttle bores.

If it really bothers you, take the carb off, turn it upside down to dump all the gas out, put it on the shelf for the winter, and replace the gaskets and re-install it as part of your spring ritual.

 

Thanks for the tips -- been a long time since I worked on a Holley but I'll give it a try.