Genarator runs short period of time & shut down

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The reason for the sudden shutdown of the diesel generator is as follows. If the user does not understand the fault of the unit and cannot solve it by himself, he must contact the professional technician.
1. The diesel fuel in the fuel tank is incorrectly marked.
2. The diesel engine generator fuel injection drive plate fixing screw is loose.
3. The fuel injection pump does not spray oil.
4. The oil return screws of the fuel supply system are loose.
5. The oil pump is not supplied with oil.
6. The oil filter screens of the diesel generator sets are blocked.

https://www.dieselgeneratortech.com/generator-sets/How-to-Star-And-Stop-Diesel-Generator-Set.html

What type of motorhome & generator is it. Some generators will shut down (basically run out of gas) at 1/4-1/2 tank in motorhome as a feature, to allow you enough gas to get to a station, in case you forget. The fitting for fuel from tank, for generator is placed that way in tank. Is that not the case? Make sure you have at least 1/2 or more fuel in tank of motorhome just to be sure, as we found many that were supposed to be set about 1/4 tank, but were closer to half tank on motorhome.