I have worked on my share, not near as many as you pro guys. My comment was about how dirty the pump is, was more a response to the fact that the OP removed it, inspected it, and reinstalled it and never cleaned it. My first chore on any saw is to clean it first, then inspect, repair, reinstall and run. I don't know how anyone can possibly properly inspect anything when it's covered in crud.
It's been awhile but it looks like yours is one you have to replace through the oil cap hole. Drain the oil, take the cap out and look inside to see if there's a barb to put it on. I may be wrong but that's my best guess. I usually use a long medical hemostat for that kinda stuff...
Yep, take off the oil cap and look through the hole with a flashlight and see if you can see it. You'll probably have to use some long needle nose pliers or something like that to remove and replace it. It's not the easiest thing to do but it can be done without much strain...
