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1999 chevy blazer v6 not the vortec, it doesnt want to start. if i turn on the key the fuel pump primes, sometimes, and when i turn the key off it "primes" too but it doesnt want to start. sometimes it will start, and when it does start it runs fine. and when its warmed up it starts fine.
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what did you do (replace it) if you still have a miss you may need to tune it up / make sure the fuel pump you bought is for the right psi for your blazer
Black smoke is usually extra fuel, but you say you are priming it to start so that could be why. Have you checked fuel pump pressure before and after cranking ?
Is it electric or mechanical pump? Electric is with fuel injection. If its fuel injection, you should hear the pump run when you turn ignition switch. If u don't hear it, try starting, if no, turn off then on. It will self prime. Carburetor is with mechanical pump. I usually put few drops of gas in the carb. Start it, if no, more in carb till it stays running.
Possibly burned out the fuel pump. Lay next to the truck with your head by the gas tank. Have your wife turn the key on but not crank the engine. You should hear a light whirring sound of the pump priming and it will last a few seconds and stop. If you don't hear the pump priming, thump the tank near the sending unit as she turn the key. If it runs, you'll need to replace the pump. If it still doesn't run, check the fuse. If the fuse is good and you have a volt meter you can trace the wires to the pump and check for voltage (12) as the key is turned on. If it has voltage, replace the pump.
Check the wireing to the pump they had problems with it it tended to over heat and corroad there is a service bulliton on the prroblem #25215705and a kit with new wires and connector to resist over heating Icould give you the kit # but i got a DELPHI pump and the connector dosn;t fit a chevy pump
The fuel pump may be running but it may not be providing enough fuel pressure. Have the fuel pressure checked at the fuel rail and if it is not to specification, replace the fuel pump.
if you don't have any leaks it is probably the check valve in the fuel pump if you just cycle the key three times by turning key on and wait 7 seconds and turn off and wait 10 seconds each cycle it will start easier if that works and it starts fine the problem is the check valve in the fuel pump
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.
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