There is a company on the internet that sells reproduction service manuals for nearly every vehicle, farm tractor, or engine driven equipment. Hopefully you will find the website. Have you checked all the fuses, both under the hood and under/in the dash? Most gas engines have a fuel pump in the gas tank, has it been checked? I've never seen a fuel shut-off solenoid on a gas engine.
On another note, you now have a second problem, if you get stopped by a LEO they may ask for proof you have permission to drive the MH, proof of insurance, etc. With the owner dead this may cause issues.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"