See if there's a cold start valve on top of the pump. This could have failed. Or maybe blown head gasket. Check valve wouldn't effect pump up time. Only when it shuts down would the check valve come into play. Cracked discharge tube or unloader line going from pressure switch to check valve might be leaking.
penguinpower81 t1_jaaqb4y wrote
Reply to brand new air compressor taking forever to fill by kattaganist
See if there's a cold start valve on top of the pump. This could have failed. Or maybe blown head gasket. Check valve wouldn't effect pump up time. Only when it shuts down would the check valve come into play. Cracked discharge tube or unloader line going from pressure switch to check valve might be leaking.