Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Check Valve

Disconnect vacuum hose from engine. Apply suction and pressure to the hose from the engine side. Check that air flows only toward engine. If the air passes in both directions or not at all, replace the check valve and hose.