if your stil workin on the 94-97 truck I think they use a little vent like they use on tranny's and diffs, you can usually pick them up from tranny shops for like $1.50 a piece, just tell them you need a vent to fit whatever hose size.
1994.5 F-350, PSD, 5spd, Crew cab, 2wd, DRW
Idle control mod
homeade exhaust brake
No, the one I need is the one that vents the tank during fill-up, it is 1-1/8" in Diameter, going in to the tank, and 5/8" to the filler vent hose. Can't find one anywhere, the Stealership doesn't even have a blow up view of it (so they say...)