Originally Posted By: R80RS
I've used Stens parts on my OPE (but never a fuel pump) with no problem. Stens appears to repackage/rebrand a lot of their products from other OEMs and aftermarket sources, so if the current Kohler part is a Korean import, there is chance that the Stens part may be identical. I'd personally take a chance on the Stens part if you can get it for half-off.
FWIW, Jack's Small Engine has the Stens pump for $88.54 and the Kohler 5255903S for $76.59, so the OE part is actually a little cheaper through Jack's.
Yes, Stens makes two pumps. One is OE which they actually buy from Kohler and rebox. They are more expensive than Kohler OE. However, they also make an aftermarket pump you can get for $35-40. This suggests the aftermarket pump may be inferior but it may be identical and the different pricing is just a marketing strategy. I asked Stens and they could not or would not tell me what the differences are.