any ideas on this? after car sits for a couple of weeks it wont start. all fuel lines are dry. i have to pull line off carb and fill it up so it will prime. could it be siphoning back to the tank if i have front of car on jacks for a long time? its an 86 with 350, mech fuel pump and all fuel lines except feed to carb are just vented.

 

Is you're gas cap secure? Do you even have one?

... make sure you plug the fuel return line. The only vented line should be the vapor canister's.

 

have gas cap but it is old so i will replace it. will plug return line. thanks.

 

in case any one was wondering. fuel pump was shot. noticed fuel spitting out of little holes on top of fuel pump. pulled apart and noticed diaphram rotted. strange thing is once reprimed it still put out 7 psi. so i bought a new holly. problem solved.