[70BLAZERX2]

The fuel pump relay is mounted under the hood,just to the right above the brake booster...there are 2 the same side by side,you can try switching them to test if it will work,It may be the pump itseld and you have to drop the tank to change that.

One more thing to check,if you have an oil leak at the oil pressure switch located by the distributor,this can cause the fuel pump not to run, All gm injected motors have a run safe built in,if oil pressure drops below 7 psi,it will shut down the fuel must circuit.

I have worked on these 92-95 CPI blazers for years...I just biult a 93 S10 with the 4.3 "W" motor in is, see pics of 93 S10 Vortec Build "w" on here.

Take a block of wood and smack the bottom of fuel tank, then listen to see if the pump runs then,if it does change the pump. And dont go aftermarket with the CPI pump, go a/c delco..unless you want low power and have to do it twice,the aftermarket pumps are universal , this needs 67 psi to open the injector up..Done to many and know its no fun to drop the tank 1 time let alone 2 ,3 ,4 you get it...