B737-800
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 187; Flight Crew Type 9832
Situational Awareness
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Weight And Balance; Inflight Event / Encounter Fuel Issue
Air Traffic Control Issued New Clearance; Flight Crew Returned To Departure Airport; Flight Crew Returned To Gate; General Flight Cancelled / Delayed
Aircraft
We were reassigned last minute to this flight due to [Out of Duty time] timeout from previous flight block time. We both had a lot of problems getting our paperwork from pilot mobile. The flight didn't auto populate like usual; we had to manually enter the flight number; origin; and select all flight to get finally get the paper work. Upon downloading the release; we realized the prior Captain has already signed for it. Captain placed a call to Dispatch; and the Dispatcher manually enter the required info and said it was successful. During review of the release; we both saw there was a previous write up with the right tank indicator showing 9;000 LBS. After pushback and start; we were informed fuel pouring out of the right vent. We elected to shut down and tow back to the gate. [Maintenance logbook] writeup was entered and Maintenance came to test the valve. It passed the test and tank was sticked to confirm quantity. Aircraft was release for flight. During climbout; FA (Flight Attendant) called to inform us a customer reporting fuel streaming out of the wing since initial right turn out of ZZZ. We stopped our climb and investigate. A call was placed with Maintenance control. We informed them of the issue and that we were concerned with the leak; quantity; and thinking about air return. Discussion was made and Maintenance said to go ahead and air return. [ATC was notified] and we landed normally slightly overweight at 148.0. Overweight landing and fuel leak writeup was entered into [logbook].
[Report narrative contains no additional information.]
B737 flight crew reported a passenger spotted fuel leaking from the wing.