Bought a new pump (4008) today and replaced the old one. New one working like a charm! Took apart the old one and everything looks fine so not sure why it is not working.
I could buy a new head and have a spare, but I'm happy with the new one, so all is good.
-2013 F150 4x2 SuperCab 3.5EB
-2011 Jay Flight 22FB