86subaru Posted March 10, 2009 Share Posted March 10, 2009 afriend of mine with a 84 brat a/t ,ea81 motor , carb, he bought a different gas tank [ used], but good shape, his problem is it is vapor locking ,,new fuel filters, different canister , ,he can only drive it with the gas cap real loose, , if the cap is tight the truck will hardly start, he switched the lines still the same thing, any help ?? Quote Link to comment Share on other sites More sharing options...
naru Posted March 11, 2009 Share Posted March 11, 2009 Vent line from tank to cannister must be plugged or 2 way valve is stuck. Should be able to blow easily thru the line from the cannister to the tank w/fuel cap loose. Proper cap should have a vacuum relief valve to prevent this. Quote Link to comment Share on other sites More sharing options...
86subaru Posted March 11, 2009 Author Share Posted March 11, 2009 also new fuel cap, ok, thanks Quote Link to comment Share on other sites More sharing options...
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