Bombardier challenger flight crew reported fuel spill during refueling.

Attributes
ACN	1608504
Time
Date	201901
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	Challenger Jet Undifferentiated or Other Model
Operating Under FAR Part	Part 135
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	Fuel Storage System
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Person 2
Function	First Officer
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Hazardous Material Violation Deviation - Procedural Published Material / Policy

Narrative:

While refueling aircraft X the aircraft fueler [at ZZZ] noticed fuel venting out of the outboard right wing vent. He immediately stopped fueling and quickly began to contain what he estimated to be 3-5 gallons of fuel located beneath the wing tip. I; PIC; asked the fueler to stop any further fueling; ensured the fuel was being contained by FBO staff; contacted the assistant chief pilot on duty; wrote a report and notified maintenance as directed by guidance written in the fom. The aircraft was immediately grounded as 'aircraft on ground'. This write up was a repeat [on date] where no defects were noted and the aircraft was released for flight. We had to contact maintenance to determine what was previously accomplished on [date] with the same mechanical issue as there was no data on the company log book. After the fact. Had we known that nothing was found or repaired previously; then we would have been more vigilant while trying to top off the wings for further fuel spills specific with this aircraft.

Original NASA ASRS Text

Title: Bombardier Challenger flight crew reported fuel spill during refueling.

Narrative: While refueling Aircraft X the aircraft fueler [at ZZZ] noticed fuel venting out of the outboard right wing vent. He immediately stopped fueling and quickly began to contain what he estimated to be 3-5 gallons of fuel located beneath the wing tip. I; PIC; asked the fueler to stop any further fueling; ensured the fuel was being contained by FBO staff; contacted the Assistant Chief Pilot on duty; wrote a report and notified Maintenance as directed by guidance written in the FOM. The aircraft was immediately grounded as 'Aircraft on Ground'. This write up was a repeat [on date] where no defects were noted and the aircraft was released for flight. We had to contact Maintenance to determine what was previously accomplished on [date] with the same mechanical issue as there was no data on the company log book. After the fact. Had we known that nothing was found or repaired previously; then we would have been more vigilant while trying to top off the wings for further fuel spills specific with this aircraft.

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.