Quest - Supply Line
Quest Pickup - Hospital (G15) (Willis)
Quest Location - Grumm City (L1)
Quest Finish Point - Grumm City (L1) (Fredo)
When you get near Fredo, Quest will go to solved, once you have talked to him, you will receive the Warehouse 14 quest.
Note: Fredo is not in Grumm City but the industrial area north of it, near a blue truck.