I run a Tanks EFI fuel tank on my 1971 Camaro.
The only issue I found with the supplied check valve from Tanks is that fuel vapor can leak out of it when the car is off. The garage ends up smelling like raw fuel.
I run an EFI system based on GM TPI electronics and run the factory 1990 Camaro solenoid operated charcoal canister. Wanting to use that, I retrofitted a 1990 Camaro venting system. So I wanted to retain the factory style vent system.
For the fresh air intake, I run the factory "mushroom" valve that mounts near the rear axle on most third gen Camaros. This hooked up to one of the vent ports on the Tanks unit.
For the vacuum line, in order to avoid sucking fuel into the canister, I drilled and tapped a 1/8 NPT into the filler neck as close to the gas cap as possible. I then installed a 90° hose barb and ran the vapor line from there into the factory '71 steel vent line that runs to the front of the car and ultimately terminates at the canister.
Been running this set up since Jan 2015 and works perfectly.
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