Fuel pump

A fuel pump is a part of Transformer anatomy, analogous to a human heart.

Fiction

Marvel Comics continuity

Blaster, reminiscing about Scrounge, said that his friend wasn't much of a warrior, but had a "fuel pump as big as a planet". Crater Critters

IDW Generation 1 comics

Upon awakening on the planet Clemency, Fulcrum was a little put out to find that Misfire had already salvaged his fuel pump. Misfire later graciously returned the organ. Rules of Disengagement