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2001 blazer fuel pump eletrical issue

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Old May 5, 2020 | 01:00 PM
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Default 2001 blazer fuel pump eletrical issue

I had an alternator go bad and when i replaced alternator it wouldn't start. So we let the car sit for about a year and of course everything is dead. Replaced battery,and tried to crank it still doesnt start. We get spark but no fuel. We replaced fuel pump and filter still wouldn't start. No power to fuel pump. We check all,grounds all seamed good. We then checked relay and found battery side hot but computer side dead with key on. No signal fron computer. Anyone have advice to fix this, or a next step to try? Any help woud be appreciated.
 
Old May 5, 2020 | 03:57 PM
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* Moved to 'Lighting & Electrical' *
 
Old May 6, 2020 | 02:59 AM
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Fuelpump will run for about 4 seconds before the PCM shuts it off, try jumping 12v directly to the Fuel pump terminals in the Underhood fusebox.
 
Old May 6, 2020 | 07:03 AM
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If the pump,just came on for 4 seconds and changing out filter and pump the fuel lines are empty how does the fuel have time to get to engine? Does it need to be primed some way or another?
We did the code reader and it showed multiple codes but in doing so the,wrong button was pushed and all were erased.,Any ideas on going forward? Can a auto repair shop pull anything up with there equipment and determine problem or should i just sell it for parts?
 

Last edited by Radding42; May 6, 2020 at 09:08 AM.
Old May 6, 2020 | 01:27 PM
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Originally Posted by Radding42
If the pump,just came on for 4 seconds and changing out filter and pump the fuel lines are empty how does the fuel have time to get to engine? Does it need to be primed some way or another?
We did the code reader and it showed multiple codes but in doing so the,wrong button was pushed and all were erased.,Any ideas on going forward? Can a auto repair shop pull anything up with there equipment and determine problem or should i just sell it for parts?
Thats the point of running the pump, it self primes everything, get a fuel pressure tester and hook it up to that port on the silver fuel rails on the back of the intake. should have 60 PSI *when* the pump runs and hold above 55PSI for 10 minutes. Do some diagnostics, The PCM isnt hard-dead which is good, Someone around here has a wiring diagram for the PCM harnesses , search abit and then start diagnostic testing. are you sure you have no fuel? crank it and then pull the #4 Sparkplug (easiest to get to) and see if its wet with fuel.
 
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