Apologies I read this title thinking it was a head change rather than a reseal, did the pump turn over by hand with the normal easy-hard-easy-hard motion on the pulley? Things I can think of if its just the head been off, check the solenoid valve is fully opening, the pump could be completely aired up, or are you sure the control pin has sat back into the control collar of the plunger?
![[Image: 22f2b6b2-758b-4c1c-96fb-6fa9c6059b13_zpsf306b56b.jpg]](http://i585.photobucket.com/albums/ss299/Ha11elujaz0rs/22f2b6b2-758b-4c1c-96fb-6fa9c6059b13_zpsf306b56b.jpg)