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TM 10-4320-343-14
Table 4-2.1 Unit Troubleshooting Table (Model 350 PAFN). (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 1
Check and see if fuel control linkage (Figure 4-59) is moving to the "fuel valve open" position while start
attempt is made. If no movement is detected go to step 9.
Step 2
Note if engine is cold (below 40° F). If engine is cold, go to step 15.
Step 3
Note if air cleaner clog indicator (Figure 2-2 ) is in the safe zone. If filter is clogged a red band will be
seen around the indicator.
Service air cleaner (paragraph 4.10.5) if the red warning band is displayed.
Step 4
a. Prime water separator(paragraph 2.5.2).
b. Prime engine fuel pump and bleed fuel lines(paragraph 4.10.16.4a).
c. Bleed injection lines(paragraph 4.10.16.4b).
Notify Direct Support Maintenance.
Step 5
Check fuel valves on top of fuel tank as follows. If external source fuel is used, make sure hoses are
connected to that source:
a. Remove and retain plug from valve.
b. Using a flashlight, observe valve passages while rotating handle.
c. Ensure valve handle pointer positions and valve internal passages agree with decal.
d. Remove and align handle in accordance with information plate.
e. Install plug or elbow retained in step a. on valve.
If valves are defective, replace them (paragraph 4.10.16).
Step 6
Check for clogged fuel lines and filters (Figure 4-28 and 4-16.1).
a. Replace filters (paragraph 4.10.18 and 4.16.1) if unserviceable and/or clean fuel lines, paragraph
4.10.16 if clogged.
b. Replace fuel pump (paragraph 4.10.17) if fuel is not available.
Step 7
Check for debris in fuel strainer (Figure 4-27) of fuel pump.
Clean fuel pump strainer (paragraph 4.10.17) as required.
Step 8
Check for binding fuel linkage (Figure 4-59)
Repair linkage by replacing defective components (paragraph 4.14.6), lubricate or unbind linkage as
required
Step 9
Remove branched cable assembly (item 15, Figure 4-52) and check it for open and short circuits.
Replace cable assembly (paragraph 4.14.1), if defective.
Step 10
Test fuel control actuator (item 14, Figure 4-52)as follows:
Change 1 4-10.3
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