M978 Tanker Maintenance Instructions (Cont)
VAPOR RECOVERY TEST (CONT).
Place V6 fuel-defuel valve in fuel
Locate V10 bottom load valve beneath
tank. Turn and hold lever open, thus
opening top vent valve. Secure lever in
open position using tiewraps or wire.
Do not allow more than 3 psi pressure in
M978 tank. Damage to tank may result.
The V10 bottom load valve lever shall be released after completion of first part of test
b. Test Operating Procedure.
Refer to test operating procedure documented in:
CERTIFICATION AND TEST PROCEDURES FOR VAPOR RECOVERY SYSTEMS OF FUEL
During pressure tests, ensure air pressure is drained to 0 psi (0 kPa) before taking off any
If pressure is not released, plates or line could blow off and harm personnel.
Do not drain air from tank with any part of body in air spray path. Skin embolisms and/or
debris in eyes can occur from released pressure.
Reduce tank pressure to atmosphere pressure at 4 in. camlock test cover (5).
Remove 4 in. camlock test cover (5) and reinstall quick disconnect cap.
Remove vapor recovery test kit and reposition 90-degree elbow to original position.
d. Follow-on Maintenance. None.
END OF TASK