Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSGMC2020SIERRA 2500 HD AT4, 6.6L ENG VIN YREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS AND FUEL - 6.6L (L5P) DIESEL - SPECIFICATIONSSPECIFICATIONSAPPROXIMATE FLUID CAPACITIES
2020 GMC Sierra 2500 HD AT4, 6.6L Eng VIN Y
Approximate Fluid Capacities
2020 GMC Sierra 2500 HD AT4, 6.6L Eng VIN YSECTION Approximate Fluid Capacities
| Application | Specification | |
|---|---|---|
| Metric | English | |
| Fuel Tank Capacity - 2500 Series and 3500 Series Standard Box (Except Double Cab Diesel) | 136.3 liters | 36.0 gallons |
| Fuel Tank Capacity - 2500 Series and 3500 Series Standard Box (Double Cab Diesel) | 111.3 liters | 29.4 gallons |
| Fuel Tank Capacity - 2500 Series and 3500 Series Long Box (Except Regular Cab Diesel) | 136.3 liters | 36.0 gallons |
| Fuel Tank Capacity - 2500 Series and 3500 Series Long Box (Regular Cab Diesel) | 106.0 liters | 28.0 gallons |
| Fuel Tank Capacity - 3500 Series Chassis Cab - Front Tank | 89.0 liters | 23.5 gallons |
| Fuel Tank Capacity - 3500 Series Chassis Cab - Rear Tank | 151.4 liters | 40.0 gallons |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.