Just make sure its rated for fuel.Nice Jake...
Best bet would be to take the nipple piece to auto part store to get a match... they don't have exact part numbers for o rings... The one replaced on my generator i just found a match. NAPA was very helpful.
Thanks a million for this post. I'm building another 05 Teack Bike and I also ran into the same situation. I looked on the internet for weeks and finally typed up my problem the right way and your post came up. I had the same thoughts as you about it must have an o ring. I'm glad to know that it can be replaced. This will be my project this weekend.I almost glued mine but since the nipple moved a little back and forth and up and down, I knew that it wasn't glued together in the first place so I assumed it had an o-ring in the housing.
I like most people (I assume) are afraid to touch the sending unit because its plastic and if anything breaks you need a new sending unit/pump which are "cheap" compared to the dealer pricing but still are in the $200 range which isn't really that cheap.
The dealer is no help either they just replace the whole pump so you're on your own.
I just took my time and was very easy on everything I touched.
I saved myself at least $200 on a new "unknown condition" sending unit plus a week of waiting for it from eBay when the real issue is a 10 cent o-ring and a 30 minute fix.
I hope this helps everyone else that has this issue just wish I had caught some people before they bought new pumps to solve this issue.