Narrative:

This flight was to be focused mostly on simulated IMC training for a student pilot training for his private pilot certificate. After completing a pre-flight inspection and briefing of what to expect for the day's lesson we requested a departure.1;000 feet AGL- my student gives me the controls of the airplane to put on his view limiting device and then continues climb to 2;000 feet MSL; vectored by me.2;000 feet MSL- we then leveled at 2;000 feet MSL and began to practice turns to headings. The problem arose when I began to smell fuel vapor in the cabin. It led me to look around atop of me on the ceiling and the bottom left and right wing for any fuel leaks. I looked at the right fuel tank sump on my side and there was a visible stream of fuel leaking.the corrective action I took was to then terminate the lesson with my student; make a left turn to return to [the departure airport and advise ATC] while keeping my student calm and explaining the problem.the tower offered any suitable runway. We chose the easiest [runway] to maneuver towards; (straight in). The tower reacted accordingly; offered services and had an [a] truck follow us to our ramp.

Google
 

Original NASA ASRS Text

Title: C152 flight instructor reported returning to the departure airport after observing fuel streaming from the fuel tank sump drain.

Narrative: This flight was to be focused mostly on simulated IMC training for a student pilot training for his Private Pilot Certificate. After completing a pre-flight inspection and briefing of what to expect for the day's lesson we requested a departure.1;000 feet AGL- My student gives me the controls of the airplane to put on his view limiting device and then continues climb to 2;000 feet MSL; vectored by me.2;000 feet MSL- We then leveled at 2;000 feet MSL and began to practice turns to headings. The problem arose when I began to smell fuel vapor in the cabin. It led me to look around atop of me on the ceiling and the bottom left and right wing for any fuel leaks. I looked at the right fuel tank sump on my side and there was a visible stream of fuel leaking.The corrective action I took was to then terminate the lesson with my student; make a left turn to return to [the departure airport and advise ATC] while keeping my student calm and explaining the problem.The tower offered any suitable runway. We chose the easiest [runway] to maneuver towards; (straight in). The tower reacted accordingly; offered services and had an [a] truck follow us to our ramp.

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.