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Because that is just for added emissions controls on newer vehicles. I did add one to my 97 van but I also added the fuel pressure sensor into the sending unit long ago. I just got tired of the fuel smell in hot weather when parked.
You can delete all the other connections or extend them to a pressure sensor and a 98+ OBS canister with the vent valve on it. The purge will work either way. It will smell any worse that in smells currently. When mine was parked in the shop with 20+ gallons of gas it would smell of fuel. The vent valve eliminated it. If you never park in an enclosed building you may never notice it.
It will not smell worse than it does now. The vent valve does need the pressure sensor to work correctly.
It is mearly for the early style of evap emissions leak detection and purge detection.
Ok, and so I'd be fine not including it in an LS swap, as long as the purge solenoid is there?
