What has changed on it? When I first got it running it could set for a week and crank rite up. The gas seems to be draining back in it. Would the fuel pump stop the gas from draining back in it. Is there a fuel gauge are a valve I can put in it to stop this? I know when i first got it running i would let it set and run for several hours and i stayed primed. I'm sure on my 340 it is purcolating all the gas out of the carb but I don't have room to put a spacer under it. Thanks for any advice. Ronnie