The fuel pump don't turn on every time . first when the pump as prime or if system is prime the pump will not turn on
the PCM give a ground to fuel pump relay for 2 sec and while the engine is cranking the pump is running all the time.
but pcm don't prime each time
SOURCE: how to troubleshoot 1993 chevy Z71 pcm
Hi Nsilguero,
I apologize for the delay in responding.
From your description, I'm leaning toward a timing chain problem, first stretching, then skipping and finally breaking.
If you're getting voltage to the coil and still getting no spark, there is a test I'd like you to try.
Take off the distributor cap and have someone turn the engine over while you eyeball the rotor. Is it spinning?
This going to take some back and forth interaction. Comment me back with the results. We will proceed from there.
Mike
SOURCE: 1994 Chevy S-10 Blazer 4-door fuel pump replaced but not working
you should have 2 ecm fuses under the dash in the fuse box check these one of them is probably blown I have had 2 s10 that blow this fuse occasionally
SOURCE: 99 chevy blazer start truck fine then next time go
Fuel pump relay sound bad. Under the hood in the fuse box is the location of the relay. Look under the cover for the diagram to locate it faster. Hope this helps. Please keep me posted. Good luck
SOURCE: Fuel pump issue, 2004 chevy avalanche
1s the fuel pump should not be that noisy, and the problem u are describing is a defective/worn out fuel pump, it is taking time to built pressure, replace the fuel pump and don't forget to replace the in line fuel filter as well.
SOURCE: I Have a 2002 blazer that starts but motor dies, surges when accelerating
If this engine is a VORTEC then you may have a problem with the internal fuel system. Under the top plenum there is a fuel reg and poppet valves that inject fuel into the cylinders. Sometimes the tubes that run fuel from the reg to the valves can leak and cause your problem. This cannot be found with pressure check because this occurrs after the reg. PS fuel mileage will go down. Let me know if this helps.Moe
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is it normal for the fuel pump not to turn on every time?
The first cold day has hit, now the truck won't start. I cannont hear the fuel pump turn on when I turn the key or when the engine is cranking. Is my PCM ground bad?
not yet , the fuel pump relay could be the problem or wire at relay have this check first ...you can give current direct to the pump at the connector ...the contact inside the relay don't make contact every time.
I replaced the relay before I changed the fuel pump. So how do make a direct connection?
remove relay , with a jumping wire and ignition key on..jump the terminal with orange wire and the grey you should hear the pump turning if not your problems is between relay and fuel pump
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