Fix the Necropolis water pump

Fix the Necropolis water pump is a side quest in Fallout.

Detailed walkthrough
After talking to the underground ghouls of Necropolis, travel to the watershed area and then enter the Necropolis sewers that are being guarded by Larry. In the eastern end of this section of the sewers lies a pile of junk. It is essential to the completion of the quest. Alternatively, junk can be more easily acquired from the Hub, found in a crate in the south-east corner of the weapons supply shop of Jacob in the Hub's Old Town.

The Vault Dweller then needs to approach the water pump and use their Repair skill to fix the pump. A successful skill check will fix the pump (a tool will help greatly). A critical failure will remove the junk from the Vault Dweller's inventory and deal 1 point of damage to them.

Then the Vault Dweller can rest easy that they have saved the ghouls from death. For a while, anyway.

Rewards
1000 XP for repairing the pump if super mutants attacked Necropolis, 2500 XP if the super mutants did not attack Necropolis.