The generator does not come with the fuel tank. With commercial mobile applications, the vehicle manufacturer will provide the fuel tank. With RV applications, the RV manufacturer will provide the fuel tank. The tank size is based on fuel consumption. At no load the fuel consumption is 0.38 GPH, half load is 0.71 GPH and full load is 1.28 GPH.
Cummins Onan QD 12000 - 12HDKCD-2209 Diesel Commercial Mobile Generator

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- Sound-controlled housing encloses cooling system and muffler (simplifies installation)
- Four-point fully focalized internal mounting with integrated secondary isolation
- Self-diagnostic capabilities simplify troubleshooting
- Automatic glow plug eliminates preheat time uncertainty
- Cross-flow radiator provides increased cooling efficiency
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