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Sierra Starting Issue

scott0303

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scott0303 Enthusiast

scott0303

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Guys, I am in need of opinions. Ive got a 99 Sierra with the 5.3l The last few weeks I have had a problem that is getting worse. Used to be after the truck had set for awhile, it wouldnt fire on the first key turn. It would turn over but not fire as if it had no gas. It would almost always fire right up on the 2nd key turn. Now its getting to be the 3rd key turn before it starts. Once started its fine. Im wondering about the fuel pressure regulator possibly going bad. Spark plugs and wires are new. No smell of gas ever. All opinions greatly appreciated.

Stevens03 Senior Enthusiast

Stevens03

Posted
Posted

Fuel pressure comes to mind first. Dumb question but have you changed the fuel filter lately?

 

Have you tried turning the key to the run position for 1-2 seconds, then hitting the kit to the start position and if so, did you see any change?

scott0303 Enthusiast

scott0303

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  • Author
Posted
Fuel pressure comes to mind first. Dumb question but have you changed the fuel filter lately?

 

Have you tried turning the key to the run position for 1-2 seconds, then hitting the kit to the start position and if so, did you see any change?

 

 

Steve, I havent changed the filter lately. I havent tried doing the key the way you said. I will try that and see what happens. Are you thinking fuel pump with the pressure issue or the regulator? If anyone knows what size the flare nut is on the fuel lines to the filter, please let me know. Thanks

scott0303 Enthusiast

scott0303

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Regulator :seeya: But I'm no expert... but that what it sounds like to me.

 

 

Steve,

 

Ive tried doing what you said with the turning the key over for a few seconds and then going to the start position. Seems better that way but the 2nd attempt wasnt as smooth as the first time I tried it. I waited about an hour in between attempts

scott0303 Enthusiast

scott0303

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Pull the vacuum hose off the regulator, if gas comes out or it is wet, replace the fuel pressure regulator.

 

 

will do when I get home from work. I dont think its the regulator based upon symptoms I have been reading. Will letyou guys know if its leaking

scott0303 Enthusiast

scott0303

Posted
  • Author
Posted
Pull the vacuum hose off the regulator, if gas comes out or it is wet, replace the fuel pressure regulator.

 

 

will do when I get home from work. I dont think its the regulator based upon symptoms I have been reading. Will letyou guys know if its leaking

 

 

 

didnt see any gas when I pulled the vac line. What I have figured out is that if I turn the key and wait about 4-5 seconds, then turn it all the way, its starts pretty much the first time.

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