[totalloser]

Bio is a fairly strong solvent. It will loosen all the dino gunk in the tank and promptly plug up your fuel filter. Course you already know that, I wonder if the pickup screen in the tank is plugged with dino gunk? SLICK CONVERSION congratulations. If the in tank screen was gunked up, you could probably find out by teeing into the suction side of the lift pump and checking for vacuum. Should have virtually none.

You did change the fuel filter at least once AFTER the bio right?

 

[totalloser]

EEK! Definitely look for seals and stuff in the fuel system! A whole lot of gasoline stuff will puff up with biodiesel. I even had an auto shut off nozzle get ruined by it (filling station style nozzle). Some of the plastics/rubbers may not be up to the task. Diesel fuel plumbing is usually bio safe in relatively new vehicles, but with a gasser conversion, it very likely will NOT have bio safe materials engineering.

That conversion sound even SLICKER since you sent a gas engine to the scrapheap!

PS another thing to consider is that perhaps a fuel line puffed up and the lining is seperated and plugging things up. Personally I would replace all the fuel lines anyhow if you haven't already. Especially since it was a gas truck.