What was found
REPLACED FUEL CELL AND MAINS. P/N FTA0175200, S/N 43089. DEPARTED ON SCENE RUN AT 0628. LANDED ON A PAVED ROAD. DEPARTED WITH PATIENT AND LANDED ON ROOF OF HOSPITAL. DURING 2 MINUTE COOL-DOWN OF ENGINES, PARAMEDIC GOT OUT AND NOTIFIED OF A LEAK UNDER THE ACFT. SMELLED FUEL AND SHUT DOWN THE ACFT. FUEL WAS LEAKING RAPIDLY AND STEADILY FROM A DRAIN HOLE IN THE CENTER OF THE BELLY. DEPARTED MADISON WITH 1+30 IN THE MAIN TANK. FLEW A 0.9 AND LANDED WITH 30 GALLONS (0+30) IN THE MAIN TANK. ESTIMATE LOSING NO MORE THAN 10 TO 15 GALLONS TOTAL. A WITNESS TO THE LANDING SAID THE ACFT WAS LEAKING FUEL BADLY ON FINAL APPROACH. THE FUEL GAUGE IS ONLY ACCURATE WHEN THE ACFT IS ON THE GROUND.