Air bubbles in Davco 382 - hard starting series 60

if return lines are bad, could they cause air to get in fuel?

 

They shouldn't should they? They use the same inlet/outlet you would use if it was heated with coolant, instead of return fuel. That return line should be under pressure, no? So it would spray fuel, not draw air in, if it's picking up air it would be in the head or before.

 

Yes return will not be able to cause air in fuel.

 

I had that problem as well. Turned out the fuel #### off valves were bad. I have a 2003 freightliner xl classic. There were two shut ofd valves under the bunk. I didn't even know they were there.

I just took the valves out amd ran a straight line. Problem was solved.

 

I have a 60 series with a davco filter runs the same when its cold an u can smell the fuel when it gets warm goes away. The colder the temperature the more it smokes I think its in the fuel system. Hopefully when u find the problem u will post the solution.

 

I think that it is a fuel problem because one day last winter i gave it a shot of either to see an it ran fine till the either burned than started smoking again