Flight Crew Commercial
Training / Qualification; Situational Awareness
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Fuel Issue
General Maintenance Action
Aircraft; Equipment / Tooling; Human Factors
My crew had started the mission via ground ambulance. I accepted the flight and needed to put on fuel prior to departing for the mission so I would have enough fuel to complete the mission. Prior to this I had [the aircraft] topped off for the flight back to base. Once landing at base; the aircraft did not fly again until Friday night when I accepted this mission. Upon accepting the mission I repositioned to the fuel farm to put on fuel. At this time I put on 51 Gallons Jet A fuel and then departed.Just over halfway into the flight I got a Master Caution indicating a Fuel Quantity Degrade and the Main fuel Tank was fluctuating by 50 to 100 KG's. At this point in the flight I was the closest to the hospital and continued to land there. When I went to turn final I received another Master Caution light indicating that I had a Fuel Quantity Failure on the Main tank and proceeded to land.Upon landing I called the on duty Mechanic and pulled out the MEL book to see if we could MEL it. The mechanic then called his supervisor and was given the go ahead to MEL the aircraft. The plan was for me to drop the patient off and then stop to top off fuel and then fly to ZZZ to have the aircraft fixed. On the patient flight my number 2 supply tank went offline about 5 min from the pad. Just before landing the number 1 supply tank indication also went away. I landed and dropped the patient and then flew to the fuel stop and landed. Called the Mechanic and told him what happened and then they decided to come to check the aircraft. While draining the fuel from the aircraft found water and other large debris in the fuel. The fuel was also cloudy and very brown in color.
Helicopter Captain reported fuel quantity failures on a multi-leg patient flight which was later determined by Maintenance to be caused by contaminated fuel.