At 1415 Pacific time, a Cessna 152 struck two parked fuel trucks while taxiing for takeoff at Sacramento Executive Airport. The pilot and passenger were not injured. The pilot said she had just started the airplane after fueling it and wanted to move her seat forward slightly. She grabbed the dash with one hand while releasing the seat lock with the other. The seat then slid all the way back on the tracks and her feet came off the pedals. The airplane began to move forward and she could not reach the pedals.