A Jetblue Airbus A320-200, registration N634JB performing flight B6-1334 from San Juan (Puerto Rico) to Orlando,FL (USA) with 51 people on board, was enroute at FL380 about 110nm east of Ft. Myers,FL (USA) when the crew descended the aircraft to FL240 due to problems with the fuel system and subsequently decided to divert to Ft. Myers reporting they had an issue with the fuel transfer between the tanks, which did not occur at the normal speeds. The aircraft landed safely on Ft. Myers' runway 06 about 30 minutes after leaving FL380. Following an inspection by emergency services for possible fuel leaks the aircraft taxied to the apron with emergency services in trail. After landing the crew advised they did not have a fuel leak at all, there was fuel trapped in one of the tanks, however, as the aircraft descended it began to move and become usable, the aircraft was perfectly normal again upon landing.
The aircraft remained on the ground for about 3:10 hours, then continued the flight to Orlando and reached the destination with a delay of 3.5 hours.
The airline reported the crew diverted out of abundance of caution after the crew received an error message on a computer.