hi guys, so i recently bought a 65 chevy 1/2 ton longbed, i drove it with no problems for about a month then started to get a large fuel leak from the fuel sending unit to where it connects to the metal fuel line. i figured the threads were stripped so i replaced it with a new one. i installed it carefully and found no further leaks. next time i filled up it started to leak from the fuel filler neck to where it connects to the rubber hose near gas cap. i reinstalled the clamp, smoked it and found no more leaks. a few days later it started to leak again from the fuel sending unit to the metal fuel line again. i can't figure out how/why these leaks keep persisting. it seems to happen after i fill up with gas. the last leak was so large it poured right through the floor and left huge puddle within minutes. when i removed the fuel cap i noticed it released a lot of pressure. could something be causing excessive pressure to build? can anyone offer advice?