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Yes remove both check valves, replace with a new pieces of good quality fuel hose, IIRC 5/16 for the return line and 3/8" for the fuel supply line.

By now you should have drained and replaced ALL the fluids and filters especially the fuel filter and fuel. Also remove the check valves in front of the fuel tank... This is by far the cheapest insurance you can buy.... Order a new fuel tank drain plug and git rid of the fuel that came with...

Then you need to not worry about the glow plugs at this time, there are other things that can cause it to hard start when warmed up, as long as it works normally when cold go ahead and move on the other things until you can run it long enough to get it fully warmed up. Are you still running the...

I would think after a full 10 min. the combustion chambers would be warm enough not to need the glow plugs. How does it start when fully warmed up?

There is a sticky on this forum that matches the TSU to the EESS box (EDIT it looks like the sticky is missing info about the newer smart start boxes) Are you waiting at least 90 seconds from when you put the run switch in stop and then try to re-start it (if you don't do this every time you can...