How to transfer fuel ksp?
Once your vessels are docked, right click the source and the destination tanks while holding Alt, and use the In/Out buttons to transfer fuel as needed. If docking the two vessels is impractical, you can use a small rover or spaceship to move the fuel.
KSP - Fuel Transfer Tutorial (0.18) - YouTube
While docked, you can transfer resources (fuel, etc.) by clicking on a tank, and then Mod + right click on another target and pressing the desired In/Out switches of the windows that pop up. The Kerbanauts may be transferred manually using EVAs, or using crew transfer.
When you place a fuel tank in the VAB, there's a new "Fuel Type" button, which you can click to toggle among the fuel options. Click the button to pick the one you want. Then launch and fly your ship. That's it.
With the latest update, 0.90, fuel transfer is no longer available by default in Career mode. Instead, it must be unlocked by upgrading the Research Facility. Thanks!
A fuel transfer pump simply transfers fuel either from one tank to another, or from a container to a nozzle so it can be dispensed into a vehicle. A pump can also be used to transfer fuel from one car to another, or even to extract fuel from a vehicle & back into a storage container.
Fuel Flow & Asparagus Staging | KSP Beginner's Guide - YouTube
It's also useful for craft-to-craft docking or for exchanging resources with craft or debris without a docking port. As with docking ports, resources (liquid fuel, electricity, etc.) can be exchanged with the target.
Docking specifically refers to joining of two separate free-flying space vehicles. Berthing refers to mating operations where a passive module/vehicle is placed into the mating interface of another space vehicle by using a robotic arm.
Step 4 - Transfer Fuel
Then, hold Alt (Option on a Mac) and right-click on the fuel tank of your target spacecraft that you want to refuel. The right-click menu should have a section labeled "Transfer." Under that section, press the buttons labeled "In" on both the Liquid Fuel and Oxidizer subsections.
How do you change variants in KSP?
- Place the part on the build screen, then.
- right-click the part to show it's options, then.
- hit the arrow on the bottom-right to change the variant.
You can use the KLAW if you don't have docking ports. Your two vessels have to be docked to transfer fuel between them. The only way around this is by using a dedicated fuel vessel to dock to one ship and move the fuel to the other.

By pressing R on your keyboard you can activate your RCS. Like in real spacecrafts a jet of nitrogen or other gasses (monopropellent) is propelled out of some nozzles (usually placed at a 90° degree angle on the mass centre) to control the spacecraft. Obviously you need a monopropellent tank to make it work.
You can use the KLAW if you don't have docking ports. Your two vessels have to be docked to transfer fuel between them. The only way around this is by using a dedicated fuel vessel to dock to one ship and move the fuel to the other.
The Convert-O-Tron 125 or Convert-O-Tron 250 on a craft can be used to convert Ore that has been drilled to fuel, but there are no other ways to generate fuel [outdated]; its only source is tanks added to craft during construction in the Editor.
Once armed, approach perpendicularly to the target surface at no more than a few m/s and the extended claw will automatically grab anything it collides with (or that collides with it), docking the target to the current vessel. To undock from the target, right-click the AGU and choose Release.
By pressing R on your keyboard you can activate your RCS. Like in real spacecrafts a jet of nitrogen or other gasses (monopropellent) is propelled out of some nozzles (usually placed at a 90° degree angle on the mass centre) to control the spacecraft. Obviously you need a monopropellent tank to make it work.