Section 5.9 Plugged Fuel Filter(S)

Section 5.9
Plugged Fuel Filter(S)

To determine if a plugged fuel filter(s) 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 the fuel line into a five gallon container.

   PERSONAL INJURY ‪
   To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

3. Start the engine.
4. Run the engine at 1000 rpm.
5. Clock fuel rate for one minute.
6. Measure the amount of fuel delivered into the container.
   1. If the fuel flow is greater than 1.7 L/min. (0.5 gal/min.) and aerated (small bubbles), check for air in fuel; refer to "5.11 Aerated Fuel" .
   2. If the fuel flow is less than 1.7 L/min. (0.5 gal/min.), replace the fuel filters; refer to MBE 900 Service Manual (6SE9007), preventative maintenance chapter.

Section 5.9.1
Plugged Fuel Filter(s) Replacement

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

1. Replace the fuel filter, refer to MBE 900 Service Manual (6SE9007), preventative maintenance chapter.
2. Test the engine to determine if starting has been improved; refer to "5.9.1.1 Test Engine with Replaced Fuel Filters" .

Section 5.9.1.1
Test Engine with Replaced Fuel Filters

To determine if the replaced fuel filters resolved starting difficulty, perform the following steps:‪

PERSONAL INJURY ‪
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

1. Attempt to start and run the engine, if the engine starts and runs, no further troubleshooting is required. Shut down the engine.
2. If the engine fails to start and run, check the fuel pump; refer to "5.10 Fuel Pump" .