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Old 08-21-2021, 07:00 PM   #6
The Librarian
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Join Date: Nov 2011
Location: So Cal

When decelerating with your foot off the pedal (like going downhill in gear) a lot of vacuum is generated which draws in a lot of fuel that isn't needed. The decel valve opens under high vacuum conditions to reduce the amount of fuel entering the engine. Slightly opening the throttle will do the same thing if you remove the valves.

I don't know of anyone selling replacement parts for the decel valves. If anyone has them it would be Joe Curto. He also has the plates without the valves.
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