|
Here are some more things I tried.
With engine off I plugged the return line on my temporary fuel tank then pressurized the supply line with a syringe of fuel and locked it. There is not an air bubble anywhere in the fuel system at this point. My guess is I probably put less than 5 psi of pressure on the fuel system. I also disconnected the fuel shutoff valve electrical connector, there was fuel in this plug again, I cleaned it and dried it with compressed air.
2 things I noticed after letting it sit overnight pressurized:
- The #1 or #2 delivery valve has a slight weep. This was never noticeable because it easily evaporates.
- There are signs of fuel in the shutoff valve connector. I don’t know if this is residual from maintenance or if there is actually fuel leaking into the harness from inside the injection pump.
After putting everything back together I ran the engine to check for leaks and now noticing air bubbles in the fuel lines at idle. See attached fuel diagram:
- No air bubbles at line #1
- Air bubbles at lines #2,3, & 4.
- No air bubbles at lines #5, 6 & 8.
Is it possible the fuel filter housing has a crack or the bores where the fuel lines go in are worn causing the air leak? I’m thinking about replacing this housing, its $74 from the dealer.
The attached photo is after the engine is shut down. There is an air pocket in the supply line at the pre-filter inlet, I think this is normal but would like to confirm if anyone knows the answer.
|