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 good gage.
If gage is defective, replace fuel pressure gage. Refer to
If gage is serviceable, proceed to next step.
Check for improper adjustment of fuel pump pressure. Gage should
read 75 to 80 psi (517 to 552 kPa).
If pressure is incorrect, adjust fuel pump pressure. Refer to
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 2-34.
If nozzle is defective, replace fuel nozzle. Refer to
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 it prime, prime fuel pump. Refer to
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
If hoses and connections are serviceable, proceed to next step,