Take the bed off to get to the tank, it will be quicker than dropping the tank belive me I know.

I lost the pump in my DAK tooks hours dropping the tank, then my replacement bed got in to replace the one that got hit 6 times over time and found out I could have had the pump changed in 30 minutes removing 6 bolts

 

Biodiesel has different detergent qualities than regular diesel and will make the crud in your tank, lines, etc. break up and clog your filter and make your truck run like junk. I've heard recommendations to change the filter every 3k when you start running BD until things get cleared out.

 

I didn't say you couldn't run B100. I am running B20 right now. If I could get the used oil, I'd be running B100 too.

However, you need to change that lift pump out ASAP or you WILL HAVE PROBLEMS. The stock lift pump is a piece of crap and running B100 in it will make it go out that much faster. When it goes, so does your VP44 and you are looking at easily $2000to replace everything.

I'd also strongly suggest getting a Fuel Pressure gauge if you are running B100. A few dollars now could save you plenty in the long run.