The nipple on the bottom of the pump is broken causing all the fluid in the tank to spill out. I'm putting on a new bumper so I don't really need this feature anymore. Any suggestions on how to plug it off?

 

I used a nut/bolt/rubber washer after I dumped it

 

I've got a washer bottle without it I'd sale. $32 shipped

A little more expensive than a nut, bolt, and rubber washer, but no worries about it leaking.

 

Plug the tank with plastic weld or change the tank for a non headlight washer type.

I can honestly say they never get used anyways. And when I came to use them the wiring was f-----d so had it fixed, don't know why I bothered they never get used more than 2-3 times in 12 years. Problem is you have to flick the wiper intermittent manually 3 times for the headlight washers to operate............. hmmm waste of time. Nothing like some hand wipes and screenwash water to clean them