NO VACUUM/PRESSURE BUILDING IN TANK
Erratic pressure gage reading.
Vacuum pump control in improper position.
Place pump control in the VACUUM position when filling the tank, and in
PRESSURE position when draining the tank. Refer to WP 0005 00.
Isolation valve closed.
Open isolation valve during both, filling, and draining operation. Refer to
Engine not operating at proper speed.
Set engine throttle at 2800 RPM during tank filling VACUUM operation.
Set engine throttle at 2200 RPM during tank draining PRESSURE
No airflow through oil catch muffler.
Check airflow at oil catch muffler. If no airflow is noted during vacuum or
pressure cycles, the breather, or vacuum hoses may be blocked. Clean
and service the oil catch muffler as described in WP 0013 00.