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Hey guys, new to this thread. I have a 05 LLY that only throws a code P1093 when i am pulling my 5th wheel. Doesnt do it at all when its kust the truck. Change fuel filters multiple times, checked for kincked and soft fuel lines , all injectors fire just fine. Not sure where to go from here. Only thing i havent check was the FPRV. Only because it is $400 at the dealer. Need some help pleaae
 

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Do you have a lift pump on your truck? Also look at the larger of the 2 fuel supply line coming up to top of engine on driver's side of engine neaar the quick disconnect. That line often has a crimp in it to some extent. If you get a wide hose clamp and put it on just tight enough to keep it from crimping, that may be a help.

Look at this and pay attention to post #2 What is a P1093? - TheDieselPage.com Forums
 
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