Figure 6-243. Fuel check valve flow diaphragm.

Note. Components of the fuel check valve are

not available as replacement parts. Therefore, no

further disassembly is required.

Figure 6-242. Deleted.

(2) Apply a pressure of 85 to 95 psi to the

b. Cleaning, Inspection and Repair. Refer to

heater pump inlet port. The check ball must

bypass fluid at this pressure. Adjust socket head

c. A s s e m b l y . R e f e r t o f i g u r e 6 - 2 4 1 .

adjusting screw (F, fig. 6-242) to obtain this

d. Test and Adjustment (fig.

opening pressure.

(1) Fill valve with test fluid, MIL-F-7024A

(3) Plug the fuel pump outlet port, and the

Type II, and apply a pressure of psi to port

"FREE FLOW" (fuel inlet from

heater pump outlet port, and apply a pressure of

marked

100 psi at heater pump inlet port. There should

primary fuel filter). The check valve must open

be no fuel leakage from the "FREE FLOW"

at this pressure. Valve operation can be deter-

port.

mined when

fluid

flows

from

the

fuel

pump

outlet port.

(4) If the valve fails to pass either test,

replace entire valve assembly.

Figure 6-243. Fuel check valve flow diaphragm.

6-204