Here's another rock to drop in your pond, nothing to do with fuel, but why are you Lehman owners leaving your oil filters mounted upside down so that they drain when you shut down? I'll bet dollars to doughnuts those filters are partially or totally empty when you start and it takes a few seconds to get oil pressure after a cold start? I'll also bet that removing that filter makes a huge mess when its time to change it out? You are relying on a check valve mounted on the filter, if you are lucky it is in the filter mount body but don't hold your breath; many filters do not even have that simple thing. Make your bearings happy and keep your engine room cleaner and mount the filter "upside down" like a mug of coffee.
Why not invert it? There appears to be plenty of room in that photo. That's another mod I made, the oil pressure was nearly instant on a cold start with inverting and all you need to do is use a ziplock bag over it to change it out. Remember to fill it before installation. All the Cummins I am familiar with mount the oil filter that way.