I doubt that "resetting" the ECU would correct this problem, (that it stalls out after a few seconds running) but I would also recommend that you do have the/a factory trained tech come in and take a look at the machine to determine the actual cause or fault that is causing the shutdown.
While you don't give us a serial number to work with, I am pretty sure /it's my wild a$$ guess/ this unit's ecu will clear any codes if you disconnect the negative battery cable for about 30 minutes. but if there is still some reason the ECU is shutting down power to the LPG lock-off solenoid, the problem will return right away.