[rafredrickson]

Sounds like a fuel "filter" issue to me. There are two of them, a primary and a secondary. 
Fuel pumps either run or they don't. You should be able to hear the fuel pump cycle when you turn the key to ON but not to START.  
If you have an oil pressure warning "light", that will tell you whether the OP switch is working. If the light stays ON after starting it is an oil pressure switch problem.

Capt. George

OK TX OP is fine and will swap out filters before dtermining if pump is owrking.