LEAKING FUEL TANK DUE TO ABRASIVE WEAR AT TOP OF TANK WHERE ATTACHED TO CAR BODY.STRONG GAS FUMES FILLED THE VAN,NOTICEABLE FOR SEVERAL MONTHS, BECOMING MUCH WORSE. MECHANIC FOUND THREE HOLES INTOP OF TANK.NO BUFFERS OR PADDING WERE FOUND BETWEEN THE TANK AND BODY OF VAN.METAL AROUND HOLES BRIGHTLY WORN.SHIFTING OF GAS IN TANK FROM LEAKAGE HAD LOOSENED HOLDING STRAPS.GREAT DANGER OF FIRE.ILLNESS OF CHIEF DRIVER WITH CHEST AND LUNG PAIN FROM FUMES.