I can see why you're treating them bad. If either of my diesels got such terrible fuel mileage I'd have gotten rid of them long ago.I had a 94 Ford F-350 and averaged 17 mpg empty and 12.5 pulling my 30' toyhauler. I have a 2003 VW jetta TDI which the worst fuel mileage I have gotten so far was...
I think the main thing for needing them is if you're pushing over about 40 psi of boost.
edit: but I like overkill. As long as it doesn't have to fly, if heavier will keep it from breaking, add more metal. Well, not in this case but if I was getting close I'd sure do ARP. I'm hoping that...
So, I'm wondering what ever happened on this question. I have an 01 3500 with a 3rd iteration of the factory pump mounted on the frame. I have a fuel pressure gauge and it reads 13.5 psi at the VP-44fuel inlet. Doesn't seem to vary at all no load to going up a grade with my 30' toyhauler behind...
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