Mustang EFI / Charcoal Canister

[Hinmaton]

Not sure this applies exactly, but I installed a one way vent valve awhile back and it caused a lot of weird problems. Most of them to do with pressure build up in the fuel system.
I’m running TBI with external pump and return, 23 gallon non efi tank with the original filler neck set up: ie 5/8” vent back to filler tube and a 5/16” or smaller vent tube high up.
I figured out that the one way valve, like all the one way valves out there are in only. I also noticed that all vented gas caps are in only.
So I just vent to atmosphere and most of the problems are gone.

Hinmaton


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[robs68]

I only using one of the vents. Before I installed the vapor canister they were looped back to each other so I was getting no venting at all. I am hoping this will fix my problem. I guess I will wait to see if I need a rollover valve.