From manual Onan 5500 spec:
No Load -- .35GPH
Half load -- .6 GPH
Full Load -- .95 GPH
While checking location of generator tank fill tube should also ensure fuel gauge on control panel ismoving as you are filling.
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2013 RAPTOR 300MP w/Rear Patio Deck NO Folding Side Ladder 
2013 Silverado 3500HD LTZ CC LB 4X4 DRW
Duramax 6.6L Turbo Diesel; Allison Trans
Reese 20K; Carlisle Radial Trail RH/HD; TPMS (12 Tires)
Veteran 
PSU (GO LIONS) 
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