PRS
Active Member
In the fuel tank
In the fuel tank
Lift pump is in the tank… when were the filters changed? After having the issue?All fuel filters have been change… unless there is one I’m not aware of… as for the lift pump… where is that?
Scanned no codes… the problem seems to mostly persist when outside temperature dips to freezing or just below. All filters have been changed, but had very small particles of sand/dirt in the 1st phased filter but main filter on the engine showed no contamination.Lift is in the fuel tank. Has been scanned for codes?
Where do purchase your fuel? I just changed my filters at 3% remaining on the gauge, and even though it wasn't white, I could not see any large particles in my 1st filter. I was looking for possible evidence of the CP4.2 failure, but it was relatively clean. Cheap fuel can be very dirty, it will also have a yellowish look to it. I know of a fuel station in Parker AZ that has an average of $.20 per gallon cheaper than the others near it, and the fuel is yellowish/orange in color. My buddy bought the fuel when he was in Parker AZ without any issues, I warned him about the condition of the fuel, but he purchased it anyway. I only purchase top brand name fuel, regardless of cost, mainly because of the CP4.2.
Not trying to hijack the thread. But a quick start to your search on diesel quality.how do you know the quality of the fuel before you buy? are there recommended brands/stations that speak more to the quality of fuel?
The only bit of advice I've received is fill up where you see truckers often fill up - or truck specific fuel stations
Anyone noticing a loss of power and/or fuel mileage after the "fix" of going to the cp3.3 pump? I know the cp4 pump is supposed to have a higher pressure which should atomize fuel better to be able to create more power/fuel mileage. Stands to reason the cp3.3 would do less?
On the contrary, I am getting better mileage (both unladen and towing) and the truck seems to run smoother -- 2019 Laramie 3500 with the Standard Output Cummins.
All the 2021-2022 models have the new CP-ISB21 pump, and there are no issues I have heard of.
From what i have seen from friends the CP3.3 makes similar line pressures as the CP4 unlike the older variations of the CP3 as they have changed max psi throughout the yearsAnyone noticing a loss of power and/or fuel mileage after the "fix" of going to the cp3.3 pump? I know the cp4 pump is supposed to have a higher pressure which should atomize fuel better to be able to create more power/fuel mileage. Stands to reason the cp3.3 would do less?
This! Pre '19 CP3 and the new CP3.3 are not quite the same pumps.From what i have seen from friends the CP3.3 makes similar line pressures as the CP4 unlike the older variations of the CP3 as they have changed max psi throughout the years