ARMY TM 9-6115-670-14&P
4-78
a. Service by performing STEPS a through t of REPLACE.
TEST
a. Drain fuel day tank assembly by (performing STEPS a through e of REPLACE).
b. Refer to Figure FO-1 (WIN-T) or FO-7 (JTACS) and tag and disconnect connector J7 (6, Figure 4-
19) from engine wiring harness connector P7 (7).
c. Connect multimeter leads on pins C and D at connector J7 (6). There should be continuity.
d. Siphon fuel from overflow container into fuel day tank (4) through fuel intake hole (8). When
sufficient fuel has been added, the closed lower switch will open and no continuity will be observed.
Stop siphoning.
e. If continuity is observed, replace switches (5).
f. Place sealing compound on fitting threads and install fitting (10).
g. Install line (12) to fitting (10) and secure with clamp (11).
h. Add sealing compound to threads of fitting (10), and install in fuel day tank.
i. Connect hose from overflow container to fitting (10).
j. Connect leads of multimeter to pins A and B at connector J7 (6). There should be continuity.
k. Add fuel to overflow container, if necessary, and siphon additional fuel back into fuel day tank (4).
l. When sufficient fuel has been added, the closed upper liquid level switch will open and no continuity
will be observed.
m. If continuity is observed, replace switches (5).
n. If both switches are good, remove siphon.
o. Install line (12) between transfer pump and fuel day tank (4) on fitting (10) and secure with clamp
(11).
NOTE
When removing, make note of tiedown strap locations.
Wiring harness will need to be secured at approximately
the same places.
NOTE
Both lower and upper switches are connected to
connector J7. If one switch is faulty, both switches and
connector J7 must be replaced.
