73 Commando fuel pump problem

Hello, I have a 73 commando and if it sits for a couple of days the glass fuel filter goes dry and I have to pump and pump the accelerator to get it to start. I guess the fuel is draining back down into the gas tank. Had a carb kit put in. Go to a electric pump? Any suggestions would be appreciated. thanks, Glen

Assuming the carb and fittings are great, Big assumption the next most probable cause would be a leaking diaphram in the fuel pump. Very cheap!

Drill a hole in the fuel fill cap. If the tank vent is blocked the tank could be accumulating a vacuum that draws the fuel back to the tank when the engine is turned off. If that doesn’t help a new fuel pump may be needed. Please post your results.