My dad has a toro groundmaster 120 with a Kohler 20hp engine. The other day he let a neighbor use it and it quit running. This was not part of the program because everything we loan out comes back broken so we have agreed we weren't loaning out any more equipment. Anyway, at first he thought the neighbors gas may have had water in it. It turned out not to be the case and so we thought it might be the fuel filter. As we drained the gas, there was no obstruction of the fuel coming from the line and the filter appeared to be clean. This is the deal: When we crank it, it runs for about 2 seconds and then just stops. There is no sputtering or anything, it just shuts off but starts every single time. If we try and start it at full throttle, it will not start. If we try to start it with the choke on, it will not start either. If we try and start it as it is supposed to be started (minimum throttle, no choke) it cranks every time but shuts off after 2 seconds. There is one fuse which appears to be ok. Does this sound like a fuel pump issue? It has the type that is operated by a vacuum line. A vacuum line, one from the tank with the inline filter and one going to the carburetor. Being as engine ignorant as I am, I would say it could only be the fuel pump or the carburetor. Does this sound familiar to anyone? Could it still be electrical even though the one fuse is good?