Buy something from Crazy Earl

"Buy something from Crazy Earl" is an objective in the Story Mission Plan B in Borderlands 2

Walkthrough

Turn to the left and head for the Hotel that is glowing purple down the stairs. You will find Crazy Earl waiting there behind the heavily locked door. All you need to do is buy an upgrade, any of them. Earl will giveyou the Fuel Cell for free with whatever you purchase.

Next Objective

Install the third fuel cell