FL-T400 Fuel Tank

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FL-T400 Fuel Tank
Part image
Liquid fuel tank by
Jebediah Kerman's Junkyard and Spacecraft Parts Co

Radial size Small, Radial mounted
Cost (total) 500.00 Funds
(dry) 316.40 Funds
Mass (total) 2.25 t
(dry) 0.25 t
Drag 0.3-0.2
Max. Temp. 2000 K
Volume  ?
Impact Tolerance 6 m/s
Research Advanced rocketry.png Advanced Rocketry
Unlock cost 1 600 Funds
Since version 0.7.3
Part configuration fuelTankT400.cfg
Liquid fuel 180 Units of fuel
Oxidizer 220 Units of fuel

The FL-T400 Fuel Tank is a liquid fuel tank containing liquid fuel and oxidizer.

It is twice the size of the FL-T200 Fuel Tank, and half the size of the FL-T800 Fuel Tank.

Product description

The FL series was received as a substantial upgrade over previous fuel containers used in the Space Program, generally due to its ability to keep the fuel unexploded more often than not. Fuel tanks are useless if there isn't a Liquid Engine attached under it. They can also be stacked with other fuel tanks to increase the amount of fuel for the engine below.

Jebediah Kerman's Junkyard and Spacecraft Parts Co


The FL-T400 Fuel Tank is a liquid fuel tank containing LF/O mix. This allows it to power liquid fuel rocket engines, like the LV-909 "Terrier" Liquid Fuel Engine. If there are multiple liquid fuel tanks connected to an engine, then they will all be drained equally to power it. [1] The FL-T400 can be placed both in-line and radially mounted.

When full, one tank can power a single LV-909 "Terrier" Liquid Fuel Engine for up to 112.8 seconds at full thrust, or a single LV-T30 "Reliant" Liquid Fuel Engine for up to 25.3 seconds at full thrust.

The FL-T400 fits well on main stages before the FL-T800 Fuel Tank is unlocked, or when a more precise amount of fuel is needed.


As of version 1.5 this fuel tank has four textures that can be switched in the editor.

Dark variant
Black-White variant
White variant
Gray-Orange variant
The different variants of the fuel tank


  • This part was the first fuel tank in the game, on version 0.7.3. On release, it had 25% more fuel, and was known as the FL-T500 Fuel Tank.


The FL-T500 prior to the redesign in 0.18
  • New model and texture
  • Added 4 variants
  • New model and texture
  • (Part rebalancing) Part renamed (FL-T500 to FL-T400), cost increased from 550 to 850, fuel capacity reduced from 500 to 400, full mass reduced from 2.5 to 2.25, empty mass reduced from 0.3 to 0.25
  • (Undocumented) Part can now be right clicked on to show fuel units remaining and enable/disable fuel flow
  • (Undocumented) Allowed radial stacking/connections
  • (Bug fix) Fixed a bug that caused a massive performance drop when fuel tanks emptied (fuel tank switch lag bug)
  • (Bug fix) Fixed a small but incredibly disruptive bug which prevented engines from being connected to fuel tanks
  • Fuel tanks are now stackable to increase fuel amount (and weight)
  • (Bug fix) VAB placement bug with tricouplers, fuel tanks, and decouplers
  • Initial release
  1. This assumes that the flow priority setting has not been adjusted.