Evaporative Line Check (All Models)
- Disconnect evaporative hose from canister. Connect detached hose to a "U" tube type pressure gauge filled with water. See Fig 1.
- Gradually apply low air pressure into "U" tube so that difference of water level should be 14" (356 mm).
- Then, bind the inlet of the "U" tube and leave bound for 5 minutes. If water drops no more than 1" (25 mm) after 5 minutes, evaporative line is in good condition.