87 442, standard quadrajet carb, had rebuilt a year ago, (Mountain Man Fuel Systems) it runs great, but if you let the car sit for about 3 days, seems like the carb is empty of fuel, spray eyther and it fires instantly. Mountain Man put epoxy on the lead plugs in the bottom of the bowl, I cleaned it off and re-applied JB Weld to make sure all was sealed, but I still have the same problem. Anyone have any ideas? Car has 128k miles, I removed gas tank and cleaned out and sealed inside with POR15 gas tank sealer, even replaced the fuel pump thinking maybe it just allowing fuel to siphon back to the gas tank. I'm open to suggestions.
Mark
Mark