2021 Ram 3500 H.O.
1075 tq and 37,100# towing. Video
Forum Discussion
I will say that the Denso HP3 and HP4 pumps are not without their flaws either. We have had some failures on them as well in the Hino(Toyota) medium duty diesel trucks. There are even a few TSB's out for them. The reason why most probably don't here about them is because Denso does not have that big of a market share especially in the personal vehicle market. Even on the commercial side, diesels powered by Denso fuel systems is very small.
I think people need to understand that these pumps are pumping at very high pressures. Just as with horsepower, the higher you go, the likelihood of component failure increases as well. For all you wanting and bragging about more stock short burst power, this is what you get because the manufacturers have to increase pressure every time they have a major power increase in order to stay emissions legal. You can't have your cake and eat it too. As with VG turbos and other components, you are starting to sacrifice reliability for the pursuit of more power on engines that also have to meet emissions.
Hence the reason why I would rather the engine makes have lower power, but use more reliable parts. I can easily add power after the fact that will make the truck more reliable by ditching things like electronically controlled VG turbos and so on that are less reliable than their mechanical counterparts.
I think people need to understand that these pumps are pumping at very high pressures. Just as with horsepower, the higher you go, the likelihood of component failure increases as well. For all you wanting and bragging about more stock short burst power, this is what you get because the manufacturers have to increase pressure every time they have a major power increase in order to stay emissions legal. You can't have your cake and eat it too. As with VG turbos and other components, you are starting to sacrifice reliability for the pursuit of more power on engines that also have to meet emissions.
Hence the reason why I would rather the engine makes have lower power, but use more reliable parts. I can easily add power after the fact that will make the truck more reliable by ditching things like electronically controlled VG turbos and so on that are less reliable than their mechanical counterparts.
