A couple of things come to mind.
I gather that the truck is fuel injected. If not, that's your number one problem. Carb'ed trucks have to be modded with a specialized carb to prevent starving the engine.
Inside most fuel tanks of the H1's, there should be a gridded, angled piece of metal that helps prevent or reduces abnormal shifts of fuel during off camber situations. Sometimes that piece gets loose. Also make sure that the fuel pickup line isn't angled wierd.
I don't know if the HMMWV's tanks are the same as the civvy versions.
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1997.5 HMC4 Hummer H1 w/Slantback shell (Mine)
2006 Hummer H3 Adv. Package (Wife's)
M101A2 Trailer
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