1999 Blazer 4.3L, 5 spd, 4wd... sat for about 6 months in NY...Had a hole in the gas tank and a broken fuel pump... So 2 weeks or so ago I replaced the tank with a used one and put a brand new Fuel pump in. Blazer turned over and drove fine.. It had to sit for a short period of the last 2 weeks or so... today I climbed in and went to crank it, the battery was almost dead and it would not turn over. I hooked the battery up to my Dakota with jumper cables, So I was definately gettin enough power for crank.... However It would just turn over and over
Your battery is either faulty or ther is a parasitic drain, have it checked out at parts house. With a good battery installed, spray some starter fluid into intake housing. If it starts, then dies, you have fuel pressure/delivery problems. Can you hear the fuel pump run when you turn on the key? Hope this helps.
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The gas vapor return hose may have come off the fuel pump, it's just held on with a hose clamp, the hose may have came off. It attaches at the top of the tank, you may need to lower the gas a tank some to see if everything is connected.
replace fuse and relay.also check oil pressure switch.it controls fuel pump also. check fuel pump wires and fuel injector fuse .if all is good pcm could be faulty it controls fuel pump on .command circuit
I had this same problem with my 1997 Blazer, which required a fuel pump replacement as Nitrobike said. The sign to look for is when you get in the Blazer, turn your key forward to the accessory position, but not the start position. You should hear the fuel pump charging. It sounds like a hissing or whirring noise for about 2-3 seconds while it pumps fuel into the lines to prime the engine.
Fuel pump replacement isn't cheap, about $700-$1000.