rough running, about to sputter out

Smart man!!!!

 

It wont pressure build up. It will be a vacume causing the engine to starve for fuel. As the engine burns fuel the void needs to be replaced by air . If air cant get into the tanks it creates a vacume.

 

A vent on each tank, would have done the trick. You proved it by drilling the holes. A fitting tapped in, with a hose attached, wouldn’t hurt, at this point, extra vent.

 

Now mines been doing it, since the Overhaul. Changed check valve. Seems to be holding prime now, but after idling a little while, while winding up, it shudders and blows white smoke. Till it catches on. I changed fuel filters, See if that helps. It’s acting like it’s sucking air. I suspect the shutoffs on tanks. Going to eliminate that valve, altogether. And replace the lines from tank to pump, and pump if I have to, it’s only 4 yrs old.

 

Changed fuel filters, problem fixed. I thought they were almost new, thought I had a problem, whew!!

 

Could this problem happen if you have vented fuel caps?

 

Oh Geez. I would Probably get some heavy fuel system/ injector cleaner like l Lucas or Redline if they have it for diesel and algae cleaner and just keep on with frequent fuel filter changes .JMO

 

Mines sucking air, only sputters occasionally, after idling, while winding up. I suspect the fuel tank shutoff valves, or a hose between tank and pump. Has to be, Will know soon enough, right now, got to run, as much as I can, after 5 weeks Downtime.