Fuel tank capacity for the John Deere 5120M is 46 gal (174.1 L). That equals 23 gal (87.1 L) at half tank, with diesel listed as the fuel type.
Fuel tank capacity46 gal (174.1 L)Empty-to-full tank amount
Half tank23 gal (87.1 L)Planning guide
5-gal cansabout 10 x 5-gal cans to have enough fuel from emptyPortable fuel estimate
Fuel typedieselUse correct fuel
John Deere 5120M fuel tank capacity specs
Fuel tank capacity
46 gal (174.1 L)
Fuel capacity in litres
174.1 L
Half tank amount
23 gal (87.1 L)
5-gallon fuel cans
about 10 x 5-gal cans to have enough fuel from empty
10-litre fuel jugs
18 x 10-L jugs
Fuel type
diesel
Estimated full tank fuel weight
327 lb (148 kg) of diesel
Engine horsepower
120 hp
Engine displacement
274.6 cu in (4.5 L)
Fuel capacity per horsepower
0.383 gal per hp
Fuel capacity is a tank-size figure. Actual top-up amount and runtime depend on remaining fuel, workload, throttle use, terrain and machine condition.
John Deere 5120M fuel planning notes
Fuel capacity note
The main fuel number for the John Deere 5120M is 46 gal (174.1 L). Use it as the empty-to-full tank amount, not as a guaranteed runtime figure.
Refill planning
For an empty-to-full refill on the John Deere 5120M, plan for about 10 x 5-gal cans or 18 x 10-L jugs. Real fill amount can be slightly lower if fuel remains in the tank.
Fuel type note
The listed fuel type for the John Deere 5120M is diesel. Match the fuel type before filling; do not assume every John Deere machine uses diesel.
Full tank weight
For transport and storage planning, the John Deere 5120M full tank fuel load is roughly 327 lb (148 kg) of diesel. Actual weight varies slightly by fuel blend and temperature.
Engine context
The John Deere 5120M engine specs listed with this page are engine horsepower 120 hp, engine displacement 274.6 cu in (4.5 L), and tank-to-power ratio 0.383 gal per hp. They help compare models but are not a fuel-consumption rating.
Fuel tank capacity guide
This model
46 gal
Guide low
18 gal
Guide typical
28 gal
Guide high
50 gal
Compared with a broad Utility tractor guide, not the full tractor dataset.
John Deere 5120M fuel capacity FAQ
What is the John Deere 5120M fuel capacity?
For refueling, the John Deere 5120M is listed at 46 gal (174.1 L). This is tank size, not a guaranteed runtime figure.
What is the litre conversion for the John Deere 5120M fuel tank?
The John Deere 5120M fuel tank is 46 gal (174.1 L), which converts to about 174.1 litres.
What should the John Deere 5120M hold at half fuel?
The John Deere 5120M half-tank amount is 23 gal (87.1 L). If the machine is on a slope, the gauge may read differently.
How much portable fuel should I bring for the John Deere 5120M?
To fill the John Deere 5120M from empty, budget about 10 x 5-gal cans or 18 x 10-L jugs. If it is only low rather than empty, reduce that amount.
What fuel should I put in the John Deere 5120M?
Use diesel in the John Deere 5120M where that listing applies. Wrong fuel can create a much bigger problem than a low tank.
How long will the John Deere 5120M run on a full tank?
Runtime depends on loader work, PTO use, mowing, pulling load, terrain, throttle and engine condition. The 46 gal (174.1 L) tank gives the storage amount, not a fixed hour rating.
What does the John Deere 5120M tank size mean for refueling?
With a listed capacity of 46 gal (174.1 L), the John Deere 5120M is best planned as a larger utility / row-crop tank for fuel handling.
Official information note
Mistakes do happen. Check the operator manual, service manual and official deere.com website for official fuel capacity specifications.
