Chainsaw Oil Pump Assembly GCS450U.1-205

broke, again, after 30 minutes or less of use

It took me about 2 and half hours to take the Craftsman electric chain saw apart and install the replacement oil pump that looked just like the original pump that failed on the 2nd use of the new chain saw. The oil pump immediately worked to oil the chain. I took it out to cut up a small tree and the oil pump, again, stopped working after about 20- minutes of use cutting up the tree. I had to restort to manual oiling of the chain . . . . Again. I've done that for 3 years, since Sears told me 3 years ago that they did not have a replacement oil pump. I believe this part is very defective, since it failed on the new saw and failed again on my re-install of the replacement oil pump.