Originally Posted by chris015

you need to get ahold of a fuel pressure gauge. Go by autozone and ask for the loan a tool gauge. Its free,but you gotta leave a deposit in case you dont return it. Buy a haynes manual etc to give you some help while working on the vehicle. You need to locate the fuel port to test the pressure at which is behind the intake manifold. Needs to be around 56-60 psi and HOLD above 55 psi for 10 minutes. If it steadily falls its either the spider assembly or the valve in the fuel pump. Test the pressure at the inlet of the fuel filter too,if it holds its the injection spider,if it still steadily falls its the pump.

If its the pump,Please dont give yourself more trouble. Go buy a ac delco brand pump at the dealership,or rock auto. Aftermarket pumps dont work well with these blazers. For the spider,if thats the issue I dont think brands matter as ive never heard much about new faulty spiders.