The 2020 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.
020 gal40 gal
32.0 gal · Bigger than 97% of 2020 models we list.
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 2020 Ram 3500
$136.64to fill the 32.0-gallon tank from empty with regular, at this week's US average of $4.27 a gallon.
Other 2020 pickups of a similar size, one model per brand.
2020 Ram 3500 fuel system recalls
NHTSA lists 1 fuel-system recall for the 2020 Ram 3500, out of 11 recalls in total. A recall applies only to the vehicles named in it, so check your VIN.
Chrysler (FCA US, LLC) is recalling certain 2019-2020 Ram 2500, 3500 pickup trucks, and Ram 3500, 4500, and 5500 cab chassis vehicles equipped with Cummins 6.7L Turbo Diesel engines. The High Pressure Fuel Pump (HPFP) may fail, resulting in a sudden engine stall without warning.
Risk and remedy
Risk: An engine stall increases the risk of a crash.
Remedy: Dealers will replace the HPFP, update the Powertrain Control Module (PCM) software, and inspect and replace additional fuel system components as necessary, free of charge. Interim owner notification letters to inform owners of the safety recall were mailed on January 4, 2022. Owner notification letters were mailed on May 17, 2022. Phase 2 owner notification letters are expected to be mailed on March 2, 2023. Owners may contact FCA US, LLC customer service at 1-800-853-1403. FCA US, LLC's number for this recall is Y78.
What is the fuel tank capacity of the 2020 Ram 3500?
The 2020 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 2020 Ram 3500 gas tank hold?
The 2020 Ram 3500 tank holds 117–121 liters, or 31.0–32.0 gallons in US gallons.
Which 2020 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 2020 Ram 3500 gas tank?
No. 4WD and RWD versions of the 2020 Ram 3500 use the same 31.0–32.0 gal tank.
What gas does the 2020 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 2020 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 2020 Ram 3500?
About 198 pounds for the 32.0-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2020 Ram 3500 have a bigger gas tank than the Nissan Titan XD?
Yes. The 2020 Ram 3500 holds up to 32.0 gallons; the 2020 Nissan Titan XD holds up to 26.0.
Has the 2020 Ram 3500 had a fuel pump or fuel system recall?
Yes. NHTSA lists 1 fuel-system recall for the 2020 Ram 3500: 21V880000 (delivery · fuel pump). Check your VIN at nhtsa.gov/recalls to see if your car is affected.
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).