I have been running my 97 on B99 for about a week. I decided to change the fuel filter on Monday and found something worrisome.
The filter O-rings (3) had expanded about 25% as if they had absorbed the biodiesel. Could this translate to fuel pump problems? I assume there are O-rings in the pump??

Now waiting for the rubber fuel line behind the pump to self-destruct..........

 

Suposedly our P-7100 pumps DO NOT have any natural rubber parts in them which means no there won't be any problem, with the exception of any rubber lines used i.e. return lines and that little elbow on the lift pump which would need to be replaced with fuel line that can handle methanol (fuel injection rated hose is capable of 100% methanol or ethanol) the Gates brand Fuel injection hose os the stuff to use, Gates marine rated hose can handle up to 10% methanol not sure what % of methanol is left in biodiesel but if it takes 1 gallon of methanol to make 5 gallons of bio that's 20% right there.

 

I would question your fuel. If it is washed fuel then it should be free of methanol. I would not run unwashed fuel in my truck. Try to find another source of your bio, one th is washed.

 

Only theory at this point. I haven't actually ran or produced any bio YET, but yes it WILL be washed so I see your point of it being devoid of methanol if washed