In Virginia, off road diesel fuel is dyed red,,All the off road diesel pumps I've been around use the same hose and novel size as regular diesel. That's why many guys run their trucks on off road fuel.
The fuel system on diesel vehicles have somewhere you can see the color of the fuel,,
WOOOO is you, if you get caught with red fuel in a road used vehicle,, MAJOR fines,,
During one hurricane, the state relaxed the "red fuel" law,, for emergency use,
It was only about a week then the red fuel ban was back in place.
Maybe the fuel filters are clear??