Liquid fuel engines not running

[Dawid1]

Liquid fuel engine is not running. I try all. I don,t know what is bad. Please write how to correct use liquid fuel engines. On tutorial they are not running too. Please help!

[James Kerman]

Welcome to the forum, @Dawid1.

Some parts block fuel transfer by default like decouplers and docking ports. An image of your vessel really helps us to diagnose problems.

The forum itself does not host images however you can use an online image storage service like imgur to host the picture and link to it here.

[Harry Rhodan]

The most common problems:

a) You need a fuel tank that contains both fuel and oxidizer for rocket engines. Some of the tanks only contain fuel and are meant to be used with jet engines only.

b) You need to throttle up by either pressing the 'z' key or by holding down the shift key.

[Anth]

Yeah, the only 'engines' that only use Liquid Fuel is the Nuclear Rocket Engine and the Jet Engines.

Using Liquid Fuel only for any other engine wont work