fuel anti spill valve for gas tank
I am rodding a 36 Chevy and built my own fuel tank. I'm running a 94 LT1 engine. I used the sending unit out of a Grand Am Pontiac and put it on my homebuilt tank. The sending unit includes the fuel line, fuel return line and a vent line.
I've been told to put a roll-over anti-spill valve on the vent line. Another person said it's not necessary as that sending unit has the roll over anti spill valve built into the sending unit. I've also been advised to put the vent below the tank level so that if the car does roll over the vent line will be above the tank and won't spill fuel.
Does anyone know if the GM sending units for fuel injected vehicles (about 1990 or 91) had a built-in anti spill in the vent line? Is it a good idea to put the vent line below the fuel tank level? Seems like you could get a siphon effect and leak fuel in the upright position if that was the case.
Thanks for any help.