Series 50 – Section 17.9 Plugged Fuel Filter(S)

Section 17.9
Plugged Fuel Filter(S)

To determine if a plugged fuel filters is causing starting difficulty, perform the following steps: ‪

1. Disconnect the fuel line return hose from the fitting located at the fuel tank.
2. Place the opened end of fuel line into a five gallon container.
3. Start the engine.
4. Run the engine at 1000 r/min.
5. Clock fuel rate for one minute.
6. Measure the amount of fuel flowed into the container.
   1. If the fuel flow is greater than 1 gal/min, check for air in fuel; refer to "17.11 Aerated Fuel" . Shut down the engine.
   2. If the fuel flow is less than 1 gal/min, replace the fuel filters; refer to "17.9.1 Plugged Fuel Filter(s) Replacement" . Shut down the engine.

Section 17.9.1
Plugged Fuel Filter(s) Replacement

Perform the following steps to replace fuel filter(s):‪

1. Replace the fuel filter; refer to "2.7.1 Replacement of Fuel Filter" .
2. Test the engine to determine if starting has been improved; refer to "17.9.1.1 Test Engine with Replaced Fuel Filters" .

Section 17.9.1.1
Test Engine with Replaced Fuel Filters

Perform the following to determine if the replaced fuel filters resolved starting difficulty:‪

1. Attempt to start and run the engine.
   1. If the engine starts and runs, no further troubleshooting is required. Shut the engine down.
   2. If the engine fails to start and run, check the fuel pump; refer to "17.10 Fuel Pump" .