hi, i just got a 95 s10 blazer 4.3 vortec. when i got it it was hard to crank after it'd been sittin overnight or longer. I hooked up my fuel pressure tester to it and ran some gas into a jar and it was mostly water. I took the tank out and drained it and put fresh gas in it and now it wont start. holdin 60+ psi on rail and cranks with startin fluid. any ideas??

 

rusted block?