Capt. Evan Clark was patrolling the Allegheny River to help Three Rivers Waterkeeper get a better understanding of just how much of a mark that fuel spill made.

Most heavy-duty vehicles run on diesel engines ... reefers have a separate fuel tank that solely powers the trailer's ...

Similarly to what to do if diesel fuel gets in your gas engine tank by accident, start by not turning on your truck. Then, call a mechanic or repair shop immediately. Get your truck towed there ...