Gulfstream V10 Class C Won't Start

Have a 2002 class C 31' Gulfstream Ultra, 27,000 miles in storage. Occasionally, maybe once a month we start it. Cranks over fine but won't catch. Sounds like it wants to start. Fuel Injection, internal fuel pump, etc.?? Need help, please. If it was the old carburetor days we could spray down the carb. May or may not sell it when we figure out if we want to do it anymore. We live in a 5er (5th wheel). Thanks