WHAT SIZE Fuel Sender??

Mopar_Chick said
So I also have a question about this. I need to get a new fuel sending unit and the options they give you is a 3/8 and a 5/16 which one do I need? I thought it was the 5/16 but not sure? It's for a original V8 car with a 318.

Car came with a 5/16, BUT, Might as well buy the 3/8 in case you want to upgrade the engine.

No real point in buying a 5/16 unless it's for the resto crowd.