TM 10-4330-232-12&P
Table 4-2. Unit Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. CONTAMINATED FUEL.
Remove unit cover and inspect canister and filter elements for damage (para. 4-18 and 4-19).
Replace filter elements (para. 4-18).
2. NO FUEL DELIVERY.
Check to see if pumping unit is operating properly.
If pumping unit is not operating properly, refer to applicable technical manual.
3. GENERAL FUEL LEAKAGE.
Step 1. Check gaskets and/or seals.
Replace if damaged (para. 4-14).
Step 2. Check lines and fittings for tightness.
Tighten lines and fittings or replace as needed (para. 4-19).
Step 3. Check for cracks or breaks in tank shell.
Replace a cracked or damaged tank (para. 4-15).
4. SUDDEN INCREASE IN PRESSURE DIFFERENTIAL.
Step 1. Check to see if lines to differential pressure gage are clogged.
Unclog lines (para. 4-19).
Step 2. Filter elements dirty.
Replace filter elements (para. 4-18).
Step 3. Check differential pressure gage
Replace damaged differential pressure gage (para. 4-21).
4-6
