TM 5-3805-290-23-1
FUEL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0011 00
AIR IN FUEL TEST - CONTINUED
N OT E
If second sight gage is not available, move sight gage from fuel return line and install sight gage at inlet to
fuel transfer pump.
8.
If excessive air is seen in sight gage in fuel return line, install second sight gage at inlet to fuel transfer pump.
9.
Observe fuel flow during engine cranking. Check for air bubbles in fuel.
10.
If engine starts, check for air in fuel at varying engine speeds.
N OT E
If excessive air is not seen at inlet to fuel transfer pump, air is entering system after fuel transfer pump.
If excessive air is seen at inlet to fuel transfer pump, air is entering through suction side of fuel system.
11.
Prime fuel system, if necessary (WP 0029 00).
11
11
WARN I N G
To avoid injury to personnel, always wear eye and face protection when using pressurized air.
11
CAU T I ON
To avoid damage to equipment, never use more than 5 psi (34 kPa) to pressurize fuel tank.
12.
Pressurize fuel tank with air to 5 psi (35 kPa). Check for leaks in fuel lines between fuel tank and fuel transfer pump.
Replace any fuel system components found to be leaking or damaged.
13.
Check fuel pressure. Refer to Fuel System Pressure Test in this work package.
14.
If source of air is not found, disconnect supply line from fuel tank and connect external fuel supply to inlet of fuel trans-
fer pump. If this corrects problem, inspect fuel sending unit and replace if necessary (WP 0177 00).
15.
If problem still exists, inspect and replace fuel tank (WP 0166 00).
0011 00-3