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Fuel Injection

monkey2002

By monkey2002
in Ask A GM Technician

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monkey2002 New Member

monkey2002

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Good afternoon,  I have an issue with my 2002 Sierra 2500HD 6.0L.  I recently replaced the fuel injectors, fuel rails, FPR, plugs, wires and coil packs on all 8 cylinders.   Before I was having miss fires on # 6 while pulling hill on highways and towing my travel trailer.  That is why I decided to do a tune up.  I have only owned the truck for a year and had no idea when or if any of those parts were replaced so I thought it was a good idea.  However after I replaced all those parts I was having an issue starting, I play around more and noticed that the FPR vacuum hose had a small crack in it, so I replaced.  That solved the issue upon a cold start, it fires right up like normal.  However when engine is a operating temp and I try to start it, it has a long hard start.  I found if I cycle the key a few times it starts easier but still a longer than normal crank.  I'm looking to see if anyone has had this issue and found a fix before I spend a lot of money a dealer to solve issue.  Thanks in advance. 

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

I do not know when they moved fuel filter to inside the tank, but, if you have an external fuel filter, replace it.  Also do you hear the fuel pump when you turn the key on?  How long does the pump run?  The only thing that happens with key on- engine off is the fuel pump precharges the fuel rails and pressurizes the system.  Perhaps the pump is not running long enough to do this in one cycle. 

monkey2002 New Member

monkey2002

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Not sure if it does have an external or not but the not thing that gets me is I never had this issue before I replaced everything.  Just seems odd to me 

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

Stick the old fpr back on.  What you describe, especially the key on 3 times before it will start leads towards fuel. 

 

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