Motor-Runner

 is the leader of the Fiends, located in Vault 3 in 2281.

Background
He is found in the maintenance wing with his two guard dogs, BoneGnash and GhashBone.

Other interactions
The Courier can give him various drugs (jet, psycho, etc) for 20 caps(or 22 caps, if the player passes the barter check) if you pass a speech check at the entrance of Vault 3 when speaking to the Fiend at the door.

Appearances
appears in Fallout: New Vegas.

Bugs

 * Trying to sell ALL of your Jet/Buffout/Psycho from your personal stash to Motor-Runner might not work (option is available, but nothing happens). Selling single doses of Jet/Buffout/Psycho still works, though. Possible reason for this: you might have stolen chems from the Vault 3 Fiends. Since you cannot sell items to the faction you stole it from this option doesn't work. It could also be possible that there is a problem with the player carrying "Dixon's Jet" which is bought in Freeside.
 * (X360 Patch 1.01) When speaking with Motor-Runner about NCR sending you to kill him, I choose to work an arrangement about telling NCR(Hsu) that his dead for a price. After the [75]speech-check chosen(80spch skill) he said: "I'm not gonna pay you squat. Now get out of my face." So either you pay him 200 caps for his helmet or kill him. Don't know if its a bug at all since isn't possible to see a [SUCCESS] in the speech dialog.