2018 GMC Sierra 1500 Fuel tank size
Depends on your version. Choose yours, or compare them here.
- 1500 Series Standard and Short Box 26.0 gal
- 1500 Series Long Box 34.0 gal
- 2500 Series and 3500 Series Standard Box 36.0 gal
- 2500 Series and 3500 Series Long Box 36.0 gal
- 3500 Series Chassis Cab 63.5 gal
26.0gal
1500 Series Standard and Short Box
34.0gal
1500 Series Long Box
36.0gal
2500 Series and 3500 Series Standard Box
36.0gal
2500 Series and 3500 Series Long Box
63.5gal
3500 Series Chassis Cab
2018 GMC Sierra 1500 Owner's Manual, PDF page 463
1500 Series Standard and Short Box 98.4 L 26.0 galOpen the manual at this page ↗Added Oct 15, 2026
See where it's printed
Fuel tank size · 1500 Series Standard and Short Box · PDF page 463
1500 Series Standard and Short Box 98.4 L 26.0 gal
Fuel tank size · 1500 Series Long Box · PDF page 463
1500 Series Long Box 128.7 L 34.0 gal
Fuel tank size · 2500 Series and 3500 Series Standard Box · PDF page 463
2500 Series and 3500 Series Standard Box 136.3 L 36.0 gal
Fuel tank size · 2500 Series and 3500 Series Long Box · PDF page 463
2500 Series and 3500 Series Long Box 136.3 L 36.0 gal
Fuel tank size · 3500 Series Chassis Cab · PDF page 463
3500 Series Chassis Cab 240.4 L 63.5 gal
2018 GMC Sierra 1500 Owner's Manual, PDF page 463
1500 Series Standard and Short Box 98.4 L 26.0 galOpen the manual at this page ↗Added Oct 15, 2026
See where it's printed
Fuel tank size · 1500 Series Standard and Short Box · PDF page 463
1500 Series Standard and Short Box 98.4 L 26.0 gal
2018 GMC Sierra 1500 Owner's Manual, PDF page 463
1500 Series Long Box 128.7 L 34.0 galOpen the manual at this page ↗Added Oct 15, 2026
See where it's printed
Fuel tank size · 1500 Series Long Box · PDF page 463
1500 Series Long Box 128.7 L 34.0 gal
2018 GMC Sierra 1500 Owner's Manual, PDF page 463
2500 Series and 3500 Series Standard Box 136.3 L 36.0 galOpen the manual at this page ↗Added Oct 15, 2026
See where it's printed
Fuel tank size · 2500 Series and 3500 Series Standard Box · PDF page 463
2500 Series and 3500 Series Standard Box 136.3 L 36.0 gal
2018 GMC Sierra 1500 Owner's Manual, PDF page 463
2500 Series and 3500 Series Long Box 136.3 L 36.0 galOpen the manual at this page ↗Added Oct 15, 2026
See where it's printed
Fuel tank size · 2500 Series and 3500 Series Long Box · PDF page 463
2500 Series and 3500 Series Long Box 136.3 L 36.0 gal
2018 GMC Sierra 1500 Owner's Manual, PDF page 463
3500 Series Chassis Cab 240.4 L 63.5 galOpen the manual at this page ↗Added Oct 15, 2026
See where it's printed
Fuel tank size · 3500 Series Chassis Cab · PDF page 463
3500 Series Chassis Cab 240.4 L 63.5 gal
All versions
| Applies to | Value | Manual says | Page |
|---|---|---|---|
| 1500 Series Standard and Short Box | 26.0 gal | “1500 Series Standard and Short Box 98.4 L 26.0 gal” | PDF page 463 ↗ |
| 1500 Series Long Box | 34.0 gal | “1500 Series Long Box 128.7 L 34.0 gal” | PDF page 463 ↗ |
| 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 463 ↗ |
| 2500 Series and 3500 Series Long Box | 36.0 gal | “2500 Series and 3500 Series Long Box 136.3 L 36.0 gal” | PDF page 463 ↗ |
| 3500 Series Chassis Cab | 63.5 gal | “3500 Series Chassis Cab 240.4 L 63.5 gal” | PDF page 463 ↗ |
Scroll the table to see the quote and page →
Confirm with your own manual, dipstick or door-jamb label.
Report a problem with this page →