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2009 gmc 1500 5.3 flex crank no start. Have spark and if i…

Customer Question
2009 gmc 1500 5.3...

2009 gmc 1500 5.3 flex crank no start . Have spark and if i put power directly to the fuel pump the pump will run but truck will not start .. injectors not working

Mechanic's Assistant: Have you ever replaced the fuel pump, or is this the original?

I have replaced the pump

Mechanic's Assistant: Are you fixing your 2500 yourself? What have you tried so far?

1500. Yes i am ... i have compression and i have replaced fuel injectors as well as coils. As before the no start i had a missfire on #7

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I think thats it

Submitted: 10 months ago.Category: Chevy
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Answered in 1 minute by:
9/29/2017
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 10 months ago
AMEDEE
AMEDEE, CHEVY TECHNICIAN
Category: Chevy
Satisfied Customers: 28,309
Experience: ASE certified tech ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
Verified

Hello and welcome!

My name isCustomerand I can assist you with your question.

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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 10 months ago

You are now connected with a mechanic.

I am very sorry you're having this issue with your vehicle.

I will try my best to answer all of your questions.

However, before we get started, please let me mention a few things.

  • I don't know your skill level or background.
  • I also don't know the vehicle's history other than what you have and provide me with here on this page.
  • Please keep in mind, I cannot see the vehicle and I am not there to run the tests and check things as needed. My answers are solely based on the information you provide me with.
  • If at any point you would like to speak on the phone, please request a phone call on your end and will call you right away.
  • If you don't understand any technical terms or anything that I mention (component tests or theory or operation), please let me know and I will provide you with a more in debt explanation or answer.
  • Please understand that I am here to help.

Have you checked for codes in the computer?

Have you checked for power to the fuel injectors?

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Customer reply replied 10 months ago
Hello im sorry for the delay ... i didnt know anyone answered my question...
Well it started when i got a wicked spark knock on number 7 ...
Codes were number 7 missfire ...
I replaced the coil ... injector and all the plugs and wires ..
Then the start postison stopped working , so i jumped the starter and it fired up ..
That worked untill a week later .. it would crank but wouldnt fire ....
Once again i checked spark ... have spark ... ok .. no fiel pressure at the rail ... so i wired the pump direct and put a intermittent switch in and when i gave the pump power it works great and have all kinds of pressure at the rail .... but still no fire .... i gave it a sniff of eaithr and it fired.
Customer reply replied 10 months ago
No worries if its not tonight ... any help is appreciated... i am a hevey equipment mechanic but this stupid thing is kicking my ass
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 10 months ago

Hello!

Would you be willing to speak on the phone?

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