2021 Ram 3500 Gas Tank Size & Fuel Capacity
Fuel tank capacity
31.0–32.0gal · 117–121 L
The 2021 Ram 3500 has a fuel tank capacity of 31.0 to 32.0 gallons (117–121 liters), depending on the trim. The most common size is 32.0 gallons, used on 18 trims.
32.0 gal · Bigger than 96% of 2021 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Fill-up cost
- Other years
- Compared
- Fuel recalls
- Pump & gauge parts
- FAQ
2021 Ram 3500 fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Drive
- no difference
- Cab
- Bed
All 35 trims
| Trim | Engine | Drive | Tank | |||
|---|---|---|---|---|---|---|
| Big Horn 4dr Crew Cab 4WD SB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 31.0 gal117 L | |||
| Big Horn 4dr Crew Cab SB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 31.0 gal117 L | |||
| Big Horn 4dr Mega Cab 4WD SB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 31.0 gal117 L | |||
| Laramie 4dr Crew Cab 4WD SB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 31.0 gal117 L | |||
| Laramie 4dr Crew Cab SB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 31.0 gal117 L | |||
| Laramie 4dr Mega Cab 4WD SB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 31.0 gal117 L | |||
| Limited 4dr Crew Cab 4WD SB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 31.0 gal117 L | |||
| Limited 4dr Crew Cab SB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 31.0 gal117 L | |||
| Limited 4dr Mega Cab 4WD SB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 31.0 gal117 L | |||
| Lone Star 4dr Crew Cab 4WD SB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 31.0 gal117 L | |||
| Lone Star 4dr Crew Cab SB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 31.0 gal117 L | |||
| Lone Star 4dr Mega Cab 4WD SB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 31.0 gal117 L | |||
| Longhorn 4dr Crew Cab 4WD SB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 31.0 gal117 L | |||
| Longhorn 4dr Crew Cab SB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 31.0 gal117 L | |||
| Longhorn 4dr Mega Cab 4WD SB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 31.0 gal117 L | |||
| Tradesman 4dr Crew Cab 4WD SB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 31.0 gal117 L | |||
| Tradesman 4dr Crew Cab SB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 31.0 gal117 L | |||
| Big Horn 2dr Regular Cab 4WD LB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 32.0 gal121 L | |||
| Big Horn 2dr Regular Cab LB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 32.0 gal121 L | |||
| Big Horn 4dr Crew Cab 4WD LB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 32.0 gal121 L | |||
| Big Horn 4dr Crew Cab LB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 32.0 gal121 L | |||
| Laramie 4dr Crew Cab 4WD LB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 32.0 gal121 L | |||
| Laramie 4dr Crew Cab LB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 32.0 gal121 L | |||
| Limited 4dr Crew Cab 4WD LB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 32.0 gal121 L | |||
| Limited 4dr Crew Cab LB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 32.0 gal121 L | |||
| Lone Star 2dr Regular Cab 4WD LB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 32.0 gal121 L | |||
| Lone Star 2dr Regular Cab LB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 32.0 gal121 L | |||
| Lone Star 4dr Crew Cab 4WD LB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 32.0 gal121 L | |||
| Lone Star 4dr Crew Cab LB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 32.0 gal121 L | |||
| Longhorn 4dr Crew Cab 4WD LB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 32.0 gal121 L | |||
| Longhorn 4dr Crew Cab LB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 32.0 gal121 L | |||
| Tradesman 2dr Regular Cab 4WD LB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 32.0 gal121 L | |||
| Tradesman 2dr Regular Cab LB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 32.0 gal121 L | |||
| Tradesman 4dr Crew Cab 4WD LB 6.4L 8cyl 8A · 4WD | 6.4L 8cyl 8A | 4WD | 32.0 gal121 L | |||
| Tradesman 4dr Crew Cab LB 6.4L 8cyl 8A · RWD | 6.4L 8cyl 8A | RWD | 32.0 gal121 L | |||
| No trim matches all of these filters. | ||||||
Tank figures are the manufacturer's rated capacity, sorted smallest tank first. The EPA doesn't rate fuel economy for heavy-duty pickups and vans (over 8,500 lb gross vehicle weight), so these trims have no official MPG or range.
What it costs to fill up a 2021 Ram 3500
$136.64 to fill the 32.0-gallon tank from empty with regular, at this week's US average of $4.27 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 31.0 gal | Regular | $4.27 | $132.37 | $99.28 |
| 32.0 gal | Regular | $4.27 | $136.64 | $102.48 |
By region, 32.0-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $128.64 |
| Midwest | $4.27 | $136.64 |
| Gulf CoastLowest | $3.70 | $118.40 |
| Rocky Mountain | $4.46 | $142.72 |
| West Coast | $5.42 | $173.44 |
| CaliforniaHighest | $5.89 | $188.48 |
Prices: U.S. Energy Information Administration retail averages for the week of October 26, 2026. This week's prices by state and city.
Your own price
- 31.0-gallon tank$132.37
- 32.0-gallon tank$136.64
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
3500 tank size in other years
The 2021 3500 uses the same 31.0–32.0 gal tank sizes as every 3500 since 2013.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2026 3500 | 31.0–32.0 gal | Not rated |
| 2025 3500 | 31.0–32.0 gal | Not rated |
| 2024 3500 | 31.0–32.0 gal | Not rated |
| 2023 3500 | 31.0–32.0 gal | Not rated |
| 2022 3500 | 31.0–32.0 gal | Not rated |
| 2021 3500 | 31.0–32.0 gal | Not rated |
| 2020 3500 | 31.0–32.0 gal | Not rated |
| 2019 3500 | 31.0–32.0 gal | Not rated |
| 2018 3500 | 31.0–32.0 gal | Not rated |
| 2017 3500 | 31.0–32.0 gal | Not rated |
| 2016 3500 | 31.0–32.0 gal | Not rated |
2021 Ram 3500 vs similar 2021 pickups
The 3500 has the largest tank of the two 2021 pickups compared here, 32.0 gallons against 26.0 for the Nissan Titan XD.
| 2021 model | Tank | Longest highway range |
|---|---|---|
| Ram 3500 | 31.0–32.0 gal | Not rated |
| Nissan Titan XD | 26.0 gal | 546 mi |
Other 2021 pickups of a similar size, one model per brand.
2021 Ram 3500 fuel system recalls
None of the 9 recalls NHTSA lists for the 2021 Ram 3500 involve the fuel system.
2021 Ram 3500 fuel pump and gauge parts
NHTSA lists no fuel-system recall for the 2021 Ram 3500, so a failed pump or gauge is a normal repair. These are the part numbers the makers list for it.
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Frequently asked questions
What is the fuel tank capacity of the 2021 Ram 3500?
The 2021 Ram 3500 holds between 31.0 and 32.0 gallons, depending on the trim. 32.0 gallons is the usual size; the smaller 31.0-gallon tank is on the Big Horn 4dr Crew Cab 4WD SB.
How many gallons and liters does the 2021 Ram 3500 gas tank hold?
The 2021 Ram 3500 tank holds 117–121 liters, or 31.0–32.0 gallons in US gallons.
Which 2021 Ram 3500 has the biggest gas tank?
The 32.0-gallon tank is on the Big Horn 2dr Regular Cab 4WD LB, Big Horn 2dr Regular Cab LB, Big Horn 4dr Crew Cab 4WD LB and 15 other trims. The smallest tank, 31.0 gallons, is on the Big Horn 4dr Crew Cab 4WD SB.
Does 4WD change the 2021 Ram 3500 gas tank?
No. 4WD and RWD versions of the 2021 Ram 3500 use the same 31.0–32.0 gal tank.
What gas does the 2021 Ram 3500 take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2021 Ram 3500?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 32.0-gallon tank from empty costs $136.64. It ranges from $118.40 in the Gulf Coast to $188.48 in California.
How much does a full tank of gas weigh in a 2021 Ram 3500?
About 198 pounds for the 32.0-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2021 Ram 3500 have a bigger gas tank than the Nissan Titan XD?
Yes. The 2021 Ram 3500 holds up to 32.0 gallons; the 2021 Nissan Titan XD holds up to 26.0.
Has the 2021 Ram 3500 had a fuel pump or fuel system recall?
No. None of the 9 recalls NHTSA lists for the 2021 Ram 3500 involve the fuel system.
Sources
- Tank sizes: manufacturer-rated capacities from US-market specifications, checked against independent references. Updated October 2026.
- MPG and range: EPA ratings. Range is tank size times EPA MPG.
- Fuel prices: U.S. Energy Information Administration, week of October 26, 2026 (this week's prices).
- Recalls: NHTSA recall database (Ram fuel system recalls).
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.