For my k-pump I've been using a spray type silicone lubricant. No build up that has to be cleaned, just apply more when it starts getting dry..

 

NRS's pump maintenance video

https://youtu.be/-ep4KmZxe8U

 

I had trouble with the grease they used in my nrs pump. It became very tough to pump after pretty modest use 12+ years ago. The thick grease seemed a magnet for any grit, sand or silt,etc.

After the first season, I wiped it all out and sprayed 303 into it.

Never abit of trouble since and allot less maintenance.

Still works like it you'd expect it to after all these years, too.

 

What! No inapropriate comments yet?!?

Good idea with the silicone and 303, my greaseless barrel pump could really use something, may have to try out some 303.

 

Down River recommends petroleum jelly. I tried it last year and it worked well for the entire season.

 

Thanks all, sounds like there are a couple of different routes to go. I too thought the buzzards might jump on this one!