So, our Shurflo 4008 water pump finally died. Motor was running but it was just spitting water. It had been making noise for 18 months...

Looking at rebuilding it. Upon teardown, the diaphragm/ valve assembly doesn't have visible wear or holes. Not sure how to check the drive assembly? Figure either it's one or the other. If both parts, it's not cost effective to repair.

If you have insight on Shurflo water pumps, please chime in.