inksmith

So, posing a question to all 5.9 owners about the ever mysterious "P0148, Fuel Delivery Error" DTC. I upgraded the tranny over 2 years ago to take an aggressive tune, installed CL on my Bully Dog back in Sept '13 and got the code the first time in Oct '13. A few more came that Nov, but I never noticed any power problems till that Dec when it lost all power with wisps of white smoke going uphill. I replaced the filters and FCA as directed but that didn't get rid of the problem. I continued getting the code until I finally took the truck down to stock completely and replaced the FCA a second time this past June. I hadn't heard a peep from the truck until Nov when it threw the code three times in as many days, the third time losing power on a flat interstate in VA BCH. We assumed the BD lift pump had gone bad and sent it in for warranty, but a week after driving it the code came back with the same power loss going up a bridge.

I've put four FCA's on this rig, replaced filters, installed a new BD lift pump and I'm still having issues. My Cummins guy and I are going to delete the factory filter and torque the tubes this week, and plan on removing the BD pump for a FASS system eventually. But something in my gut is telling me the CP3 is worn out from CL's high pressure demands, and a failed BD pump. Just want to get a feel for what everyone else may think. Thanks in advance!

BigIron70

Every time I've had this code it was injector issue, Pull all 6 injectors and have tested or replace them all. Make sure you replace the tubes also.

inksmith

Hmm, ran injector test and all past. Plan on torquing existing tubes as advised by Cummins mechanics, they noted that tubes #4 and #5 have a tendency to loosen. Not saying you're wrong at all, the problem could lie ANYWHERE in the fuel system, but all investigating has led away from injectors.

Funny note, we found that a guy with the same code replaced ALL of his fuel system trying to fix, and it turned out to be the **** MAP sensor!

Lary Ellis (Top)

Injectors...pull them out and get them tested properly by a reputable Bosch re-builder.

Dr.Dizzle

Remove the injectors and send them out for testing.