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Used Toro 3500D purchased from Mazer Eqpt in Winnipeg has 3000 hours on meter. Probably a 2006 model as indicated by serial # on Kubota turbocharged 3 cylinder diesel engine. The unit starts well and runs well with lots of power but stalls out at unpredictable times under no particular load conditions. It can be easy or difficult to start after a stall. Electrical assist fuel pump runs with regular clicking as glow plugs heat prior to starting. Does not run noticeably after a stall. Both main fuel filter after the electrical fuel pump and the in-line prefilter before the pump look clean and free of debris or water. Fuel tank vent is clear and easy to blow bubbles into fuel in tank.

Where would you look for the source of the problem?

GWF said:

Used Toro 3500D purchased from Mazer Eqpt in Winnipeg has 3000 hours on meter. Probably a 2006 model as indicated by serial # on Kubota turbocharged 3 cylinder diesel engine. The unit starts well and runs well with lots of power but stalls out at unpredictable times under no particular load conditions. It can be easy or difficult to start after a stall. Electrical assist fuel pump runs with regular clicking as glow plugs heat prior to starting. Does not run noticeably after a stall. Both main fuel filter after the electrical fuel pump and the in-line prefilter before the pump look clean and free of debris or water. Fuel tank vent is clear and easy to blow bubbles into fuel in tank.

Where would you look for the source of the problem?

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One thing I would check on any diesel doing that would be to check the fuel line connections starting at the tank, to the filters, from the filters, to the injection pump for looseness and make sure they're tight. At times they'll suck air and cavitate (cause bubbles and air in the system) causing the engine to either loose power or shut down. My advice is don't mess around with any settings on the fuel injection pump, that's for a specialty shop with proper equipment to work on it. The electric lift pump just supplies fuel to the injection pump. You could make sure you have solid fuel from the tank through the filter to the injection pump and prime it. There's a thread on here on how to do that. Since it starts and runs I don't see any need to 'crack the injector connections or lines' going to the engine. That is to get the air out of the injector lines and the injectors because a diesel must have solid fuel to operate with no air in the system. Could be a weak or intermittent electric pump acting up. If you take any of the lines loose you could get air in the system and have to bleed it all out.

I have a Groundsmaster 4700D with exact same problem, may run all day fine or stall and restart fine, sevsral time other days. Did you solve yours?

Check for collapsing fuel lines also.