CAR SPEC SHEET

2015 GMC Sierra Denali Fuel tank size

Representative photo of the GMC Sierra Denali
Representative photo of the GMC Sierra Denali. Photo: Bull-Doser, public domain
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Depends on your version. Choose yours, or compare them here.

  • 1500 Series 26.0 gal
  • 2500 Series and 3500 Series Standard Box 36.0 gal
  • 3500 Series Long Box 36.0 gal

2015 GMC Sierra Denali Owner's Manual, PDF page 398

1500 Series 98.4 L 26.0 galOpen the manual at this page ↗Added Oct 15, 2026
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Fuel tank size · 1500 Series · PDF page 398

1500 Series 98.4 L 26.0 gal

Fuel tank size · 2500 Series and 3500 Series Standard Box · PDF page 398

2500 Series and 3500 Series Standard Box 136.3 L 36.0 gal

Fuel tank size · 3500 Series Long Box · PDF page 398

3500 Series Long Box 136.3 L 36.0 gal

Representative photo of the GMC Sierra Denali
Representative photo of the GMC Sierra Denali. Photo: Bull-Doser, public domain
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3 values
Applies toValueManual saysPage
1500 Series 26.0 gal “1500 Series 98.4 L 26.0 gal” PDF page 398 ↗
2500 Series and 3500 Series Standard Box 36.0 gal “2500 Series and 3500 Series Standard Box 136.3 L 36.0 gal” PDF page 398 ↗
3500 Series Long Box 36.0 gal “3500 Series Long Box 136.3 L 36.0 gal” PDF page 398 ↗

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