To determine if a plugged fuel filters is causing starting difficulty, perform the following steps:
- Disconnect the fuel line return hose from the fitting located at the fuel tank.
- Place the opened end of fuel line into a five gallon container.
- Start the engine.
- Run the engine at 1000 r/min.
- Clock fuel rate for one minute.
- Measure the amount of fuel flowed into the container.
- If the fuel flow is greater than 1 gal/min (3.8 L/min), check for air in fuel;
- If the fuel flow is less than 1 gal/min (3.8 L/min), replace the fuel filters;
Plugged Fuel Filter(s) Replacement
Perform the following steps to replace fuel filter(s):
- Replace the fuel filter;
- Test the engine to determine if starting has been improved;
Test Engine with Replaced Fuel Filters
Perform the following steps to determine if the replaced fuel filters resolved starting difficulty
Attempt to start and run the engine.
- If the engine starts and runs, no further troubleshooting is required. Shut down the engine.
- If the engine fails to start and run, check the fuel pump;
My 12.7 2000 6r0561596 runs great BUT even with new filter in my DAVCO 382 the globe fills up @ a rate of 2/3 rds. in 10 miles. I just put a new return diverter valve in with no change in globe fill rate.
I have new fuel lines and the return line from the engine is stainless steel. KW vin.855835. I had been unaware this condition had been getting worse for a while, for me 2 yrs.and 20000 miles. In the last 6K miles really got worse. Sitting idling @ 7 hundred rpm it fills @ a rate of 2″ in 10 min. Thank You KC.