can't get my 98 blazer w/4.3 running

had a small hole in the top of the fuel tank, backed into the water to launch my boat and the back of the blazer sunk to about 8 inches up the rear tail gate. kept it running while waiting for the tow truck . got it out and parked it .when I got done fishing we loaded the boat and went home drove it for 2 days with no problem.3rd day it wouldn't start. replaced tank, fuel pump, filter, all 3 lines to tank I get fire , can put a small amount of fuel into butterfly valve but when that burns out blazer dies. I've also replaced ignition module and crank sensor, and checked that the fuel is getting to the check valve with initial turn on 3 second burst then steady while cranking still not running and sugestions?????????