I need help?

[nahnah555]

whenever i use the fuel engines they dont seem to work when i connect them to the fuel tanks, ive seen other people do it and it works fine, how come mine do not work?

[Kerbol Prime]

More details perhaps? What type engine and which fuel tank. A picture would be nice.

[Odo]

Are you holding down shift in order to throttle the engines up?

I made the same mistake with my first liquid engines. I had no idea a throttle was required.

[Whackjob]

That may be it. Left shift key, specifically, is for throttling up. Left Ctrl to throttle down. Spacebar to activate the next stage.

So what you may need to do is hold left shift, then spacebar.

Bang! Zoom! Off to the Mun!