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DE | I had a 305 that would drop about 40 psi when taken out of park. Replaced that check valve plus reference #2 check valve and also new o rings on the jumper tubes behind that valve plate and solved my pressure loss. Your check valve could be in worse shape or have something stuck in it holding it open. Cap the line going to it and see if pressure improves. You'll have to remove the cab air filter and blower and top step
Edited by cowhater 3/7/2025 22:40
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