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Chevrolet 2500hd: ihave an 05 duramax it sends a code

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ihave an 05 duramax it...
ihave an 05 duramax it sends a code for low fuel rail presure it wont start without spraying silocon spray in it runs like crap and makes black smoke
Submitted: 3 years ago.Category: Chevy
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Answered in 1 day by:
7/5/2015
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 3 years ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Chevy
Satisfied Customers: 24,196
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified
Hello and welcome to Justanswer!
You pretty certainly have one or more injectors that have failed.
When an injector mechanically fails and either returns excessive fuel or leaks into a combustion chamber when cranking it will cause either a long crank time or it can prevent starting altogether because it prevents the fuel rails from pressurizing properly. This will also cause the low rail pressure code.
If you do get the engine to start then the affected cylinders will be overfueling which will cause the poor running and smoke. the rough running and smoke lead me to believe you have at least one injector that has mechanically failed and is severely overfueling a cylinder.
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