The John Deere 8400T holds 35.91 gal (135.9 L) of fuel. The listed fuel type is diesel; half a tank is 18 gal (68 L), and an empty-to-full refill needs about 8 x 5-gal cans.
Fuel tank capacity35.91 gal (135.9 L)Empty-to-full tank amount
Half tank18 gal (68 L)Planning guide
5-gal cansabout 8 x 5-gal cans to have enough fuel from emptyPortable fuel estimate
Fuel typedieselUse correct fuel
John Deere 8400T fuel tank capacity specs
Fuel tank capacity
35.91 gal (135.9 L)
Fuel capacity in litres
135.9 L
Half tank amount
18 gal (68 L)
5-gallon fuel cans
about 8 x 5-gal cans to have enough fuel from empty
10-litre fuel jugs
14 x 10-L jugs
Fuel type
diesel
Estimated full tank fuel weight
255 lb (116 kg) of diesel
Engine displacement
494.3 cu in (8.1 L)
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 8400T fuel planning notes
Fuel capacity note
The useful refueling spec here is 35.91 gal (135.9 L). It tells you tank size; it does not guarantee hours of operation under load.
Refill planning
If carrying fuel to the John Deere 8400T, budget about 8 x 5-gal cans or 14 x 10-L jugs for a full empty-to-full refill.
Fuel type note
The John Deere 8400T fuel type is diesel. Wrong fuel is a much bigger problem than a slightly short top-up.
Full tank weight
A full tank on the John Deere 8400T adds 255 lb (116 kg) of diesel. This is an estimate for fuel weight only, not total machine weight.
Engine context
For comparison, the John Deere 8400T engine details listed here are engine displacement 494.3 cu in (8.1 L). Tank size alone does not predict fuel use per hour.
Fuel tank capacity guide
This model
35.91 gal
Guide low
18 gal
Guide typical
30 gal
Guide high
50 gal
Compared with a broad utility fuel tank guide, selected from the listed tank size.
John Deere 8400T fuel capacity FAQ
How many gallons of fuel does the John Deere 8400T take?
The empty-to-full fuel amount for the John Deere 8400T is 35.91 gal (135.9 L). If the gauge is not on empty, it will take less.
How many litres of fuel does the John Deere 8400T hold?
The John Deere 8400T holds about 135.9 litres of fuel when filled from empty.
How many litres is half a tank on the John Deere 8400T?
Half a tank on the John Deere 8400T is about 18 gal (68 L). Treat it as a planning number because gauge accuracy varies.
How many 10-litre jugs fill the John Deere 8400T?
From empty, the John Deere 8400T needs about 8 x 5-gal cans or 14 x 10-L jugs. If the tank already has fuel, you will need less.
Is the John Deere 8400T diesel or gasoline?
The John Deere 8400T is listed for diesel. Confirm at the cap, decal or manual before refueling if the machine history is unclear.
Can I calculate John Deere 8400T fuel burn from tank size?
You cannot get a reliable runtime from tank size alone. The John Deere 8400T fuel capacity is 35.91 gal (135.9 L), but fuel burn depends on field work.
Is the John Deere 8400T fuel tank big enough for regular use?
The John Deere 8400T falls into a utility tractor tank range at 35.91 gal (135.9 L). Use that to decide whether portable cans or pump refueling makes more sense.
Official information note
Mistakes do happen. Check the operator manual, service manual and official deere.com website for official fuel capacity specifications.
