TM 5-3895-385-23-1
0040
Table 1. SPN#157, FMI#18 ― Fuel Pressure Lower Than Commanded Pressure -- Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. Check fuel inlet hose for
1. If fuel inlet hose is restricted,
restriction or leaking (WP
replace fuel line (WP 0331, Vol
0331, Vol 2).
2).
2. If fuel inlet hose is not restricted,
proceed to next test.
3. Disconnect the fuel drain line
connecting the fuel pump drain
to the fuel return manifold (WP
0448, Vol 3, Figure 54).
4. Attach pressure gauge and
adapter to the fuel drain line
connection (WP 0448, Vol 3,
Figure 49).
5. Start engine (TM 5-3895-385-
1. If fuel drain line restriction is
10) and run at idle, or if engine
more than 2.7 psi (18.6 kPa),
fails to start, measure pressure
turn keyless engine switch to the
while cranking.
OFF position (TM 5-3895-385-
10), and replace fuel line (WP
0331, Vol 2).
2. If fuel drain line restriction is
equal to or less than 2.7 psi
(18.6 kPa), turn keyless engine
switch to the OFF position (TM
5-3895-385-10), restore
equipment to original condition,
and go to next test.
6. Inspect fuel lines to fuel tank
1. If damaged, replace fuel lines
for proper size, leaks, bends,
(WP 0336, Vol 2 and WP 0354,
clogs, or damage.
Vol 2).
2. If not damaged, proceed to next
malfunction.
5. Rail fuel pressure relief valve
1. Inspect fuel pressure relief
1. If damaged, replace fuel
fault.
valve for leakage or damage
pressure relief valve (WP 0337,
(WP 0337, Vol 2).
Vol 2).
2. If not damaged, proceed to next
test.
2. Disconnect the fuel drain line
from the fuel pressure relief
valve (WP 0448, Vol 3, Figure
55).
0040-5
