AFTER GETTING 2007 PETERBILT WASHED I LEFT WASH BAY TO LET TRUCK DRY. I SHUT THE ENGINE OFF. UPON STARTING THE ENGINE I SAW SMOKE COMING FROM RIGHT WHEEL WELL. I IMMEDIATELY SHUT THE ENGINE OFF. HOOD STARTED TO BUCKLE FROM HEAT. I RAISED HOOD AND FIRE WAS LOCATED NEAR LEFT SIDE OF FIREWALL. I GOT FIRE EXTINGUISHER OUT AND PUT OUT FIRE. FUEL LINE HAD RUBBED A HOLE IN IT BY RUBBING AGAINST A LARGE POWER CABLE. FUEL LEAKED AND SPARK FROM POWER CABLE IGNITED FUEL. THE TRUCK IS A 2007 -379 WITH A CATERPILLAR ENGINE. THE TRUCK HAS 300,000. DEALERSHIP TOLD ME TUFF. THIS IS A COMMON PROBLEM ON PETERBILTS AND NEEDS TO BE INVESTIGATED. I AM GLAD I DID NOT WAKE UP TO FIND THE CAB ENGULFED IN FIRE. *TR