EV 4 - Check Two-Way Check Valve

Two-Way Check Valve:

^ Visually inspect the two-way check valve and its connections for pinching, blockage, looseness, or other damage and/or leakage.

^ Remove the two-way check valve.

^ Connect a vacuum tester to port A of the valve.

^ Apply 26 mm Hg (1.01 in Hg) of vacuum to port A.

^ Verify that the valve opens (does not hold vacuum).

^ Connect the vacuum tester to port B of the valve.

^ Apply 44 mm Hg (1.73 in Hg) vacuum to port B, and verify that the valve opens.

^ Is the valve free of leakage, and does it function properly?

YES -- Go to EV5. EV 5 - Check Rollover/Vent Valve

NO -- Replace/service the two-way check valve.