B737 flight crew reported a passenger spotted fuel leaking from the wing.

Attributes
ACN	1637644
Time
Date	201904
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Fuel Storage System
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 187 Flight Crew Type 9832
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 182 Flight Crew Type 11877
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Deviation - Procedural Weight And Balance Inflight Event / Encounter Fuel Issue

Narrative:

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 pounds. 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; flight attendant (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].

Original NASA ASRS Text

Title: B737 flight crew reported a passenger spotted fuel leaking from the wing.

Narrative: 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].

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.