Table 2-2. Unit Troubleshooting (Continued)
TEST OR INSPECTION
WATER HEATER FUEL PRESSURE GAGE INDICATES PRESSURE IS TOO HIGH.
Check for defective fuel pressure gage by substituting suspect gage with a known
If gage is defective, replace fuel pressure gage. Refer to paragraph 2-37.
If gage is serviceable, proceed to next step.
Check for improper adjustment of fuel pump pressure. Gage should read 100 to 125
psi (690 to 862 kPa).
If pressure is incorrect, adjust fuel pump pressure. Refer to paragraph 2-39.
If pressure is correct, proceed to next step.
Check fuel nozzle for dirt or defects.
If nozzle is dirty, clean fuel nozzle. Refer to paragraph 2-36.
If nozzle is defective, replace fuel nozzle. Refer to paragraph 2-36.
WATER HEATER FUEL PUMP IS NOISY.
Check if fuel pump needs priming. If fuel pump indicates no pressure and fuel is
available, then fuel pump has probably lost its prime.
If pump has pressure, proceed to next step.
If pump has lost its prime, prime fuel pump. Refer to TM 10-3510-220-10.
Check for air leaks in suction hose and for loose connections.
If hoses are loose, tighten suction hose connections.
If suction hoses are cracked, replace suction hoses. Refer to paragraph 2-35.
If hoses and connections are serviceable, proceed to next step.