Not only your fuel system, but out of the tankers that carry it, the fuel station tanks, and the pumps.... Sometimes, its bad..... Thats why the second fuel filter is so nice!I've read and heard that as well. Bio diesel basically cleans out all of the crud out of your fuel system.
I use a davco on my last two freightliners. They are very good filters and the nice thing is that you can see if you need to change the element. Also the stud that the element slides on to is threaded so if you need to you can put a spin on filter. Another thing you can do is plumb the coolant through the bottom of it to keep it from plugging up in the winter.Is their anyone out there how has used a Davco 232 or 233 primary. That's what I'm planning on doing in the spring. Question I have is their any power or mileage loss with Bio the benefits of 2 to 5% I understand, not that their is anyplace to buy it around here! PLAY SAFE!