Carter AVS on a 340 drains of fuel

It might. If theres still a bit of pressure left in the line. The fuel starts to drain down in to the intake and then the carb floats drop and let the fuel in the line in to the carb. That fuel also leaks down in to the intake.

Those plugs do leak alot.

Thats your problem I bet. You replace your fuel pump so that was not it, I don't think it can suck the fuel back out of the carb anyways like that, the carb is vented.

I don't think the fuel is evaporating in 1 to 2 hours.


All you need to do is pull the carb off right after shutting it off and see if the fuel is leaking from the bottom. Were the rods go in is the vents, you can pour fuel in though there.

I have a tiny funnel and use it to the fill the float bowls up if I dont drive my car for a few weeks, you can do that each day you go start you motor until you get it repair, instead cranking it over forever.