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That's for the Fuel Tank Vapor recovery system, why was it "adjusted from stock" ?
I've never found a need to mess with it, IIRC it only work at Idle and w/ engine at normal operating Temp (not cold).
Just an FYI about that walnut sized valve, it costs around $500.
Mine is sitting in a drawer because it no longer held vacuum. Tank vapor is now directly to the air cleaner housing via #14 I believe.
My original wouldn't hold vacuum so I replaced it with a used one. Don't know if it was ever adjusted from stock. Just wondered if there was a procedure as I couldn't find one in WSM.
07-05-2023, 01:06 PM
Diaphram Valve
