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Your first problem is that somebody sold you the wrong fuel pump. The fuel pump that is supposed to work in your 1998 Chevrolet Blazer is available only as a complete fuel pump module assembly. The "pump only" kits are for the "old school" systems (cica 1980s / early 1990s) that run on much lower pressure and will not work with your vehicle.
The fuel filter may be to dirty to let the gas flow through and will need to be replaced, or most common when you run out of gas is the fuel pump will burn it self out. The fuel in the tank will keep the fuel pump cooled and will keep it from burning out, if you ran it out of gas. The pump may have burn out and will need to be replaced. Check the fuse first and hope the fuse blown due to the extra amp drown from the pump running without fuel. If the fuse is good, then check to see if you can hear the fuel pump start up when you turn the ignition key to the run position. Note the fuel pump will only energize the fuel line for 5 seconds, so you need to listen for the pump to turn on right away. The other thing too, is you can check the fuel pressure at the shredder valve, there should be 62 to 65 PSI when energizing the fuel line and will drop around 5 PSI when the engine is running. Make sure you do not try to start the engine by pouring gas down the throttle body, it been know for the gas to catch fire in the intake manifold and burn up the fuel injector system which is very costly. Start with the simple and check the fuses and fuel pump, then replace the fuel filter. At worst, your going to have to replace the fuel pump by dropping the gas tank and don't forget to replace the wire harness from the fuel pump to the frame. Good luck and hope this helps, keep me posted. Be glad to know you got your Blazer running again soon.
They should be on seperate circuits. Tyour key on and ck to see if you have any fuel flow. Fuel pumps in tanks do **** out. chk to see if you have any fuel flow by loosening a fluel line. No fuel, no pump. good luck
If your blazer is hard to start you can spray starting fluid in the throttle body and it is under the air horn. You remove the long screw which reveals the throttle body valve but do not press it open like a caruberator float just spray it in their. It helps if you turn the key on three times and then it should start. What does this all mean; Fuel Pump! I'm sorry but blazers are infamous for the fuel pump going out. Go to www.under100dollars.com and you can find a fuel pump for your blazer for like 70 dollars. If you get it from a auto parts store it's going to be like 200 or 300 dollars. It's not to hard to due but the fuel tank strap bolts can be difficult.
Time to replace the fuel filter. It's not a hard job actually. And it's a VERY common thing to go wrong. I'd change the fuel filter and then run some fuel treatment through the tank afterwards. Believe it or not, I've noticed that a nice bottle of fuel treatment really conditions a fuel filter well.