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My unloader is stuck open. How do I clean it out?

Unscrew the large red cap above the manifold.
Remove the spring and washer that were under the cap.
Unscrew the large brass bolt from the manifold and pull it out.
Clean out the unloader valve in warm, soapy water and inspect for any debris or metal burrs. Remove any foreign materials.
Flush out the cavity the unloader was in by running garden hose water through the pump. Use a flashlight to inspect the cavity for any debris and clean it out.
Reassemble the unloader, taking care not to strip the brass threads. Make sure the red knob is screwed down tightly (hand-tightened).