The ticking time bomb under the hood
Two of my friends had the Bosch CP4 high pressure fuel pump grenade in their 2012 F350s with the 6.7 liter Diesel. It took out the entire fuel system and injectors. Both trucks had over 130,000 mil...
Forum Discussion
I became aware of this just before buying my 2019 ram 3500 cummins HO with the latest CP4.2 fuel pump. First thing, everything I could find on the internet led me to believe nobody has the story on what is happening today. Older designs that used CP4 and 4.2(?) did have issues. Did Bosch make changes to 4.2 for Ram? Hundreds of web pages makes one wonder how a new truck can even make it from the dealer lot to home. Nisan Titan cummins has this fuel pump, likely a mercedes sprinter van, etc.
distilling the wisdom of the internet:
1. Ford and Chevy used CP4/4.2 in their trucks at some point, I think Ford still does. Rumor is Chevy either changed or the new 2020 model is changing to a Japanese fuel pump, Nippon Denso. The internet takes that as proof bosch is still terrible. Or, a Japanese engine mfg. picks a Japanese fuel pump.
2. Supposedly, CP 4.2 needs lift pump (ford and/or chevy didn't have early on).
A point I have not seen anywhere is that 2-3% biodiesel restores all the lubricity lost by going to ULSD. At 5% (mandated in Oregon?), any problems due to lubricity are solved. So, the hated biodiesel saves the day ...
These fuel pumps do get a lot of talk on the internet for sure. What to do, I sure don't know!
Dave
distilling the wisdom of the internet:
1. Ford and Chevy used CP4/4.2 in their trucks at some point, I think Ford still does. Rumor is Chevy either changed or the new 2020 model is changing to a Japanese fuel pump, Nippon Denso. The internet takes that as proof bosch is still terrible. Or, a Japanese engine mfg. picks a Japanese fuel pump.
2. Supposedly, CP 4.2 needs lift pump (ford and/or chevy didn't have early on).
A point I have not seen anywhere is that 2-3% biodiesel restores all the lubricity lost by going to ULSD. At 5% (mandated in Oregon?), any problems due to lubricity are solved. So, the hated biodiesel saves the day ...
These fuel pumps do get a lot of talk on the internet for sure. What to do, I sure don't know!
Dave
