Piper Twin Piston Undifferentiated or Other Model
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 116; Flight Crew Total 740; Flight Crew Type 91
Distraction; Situational Awareness; Time Pressure
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Fuel Issue
Flight Crew Returned To Departure Airport; Flight Crew Landed As Precaution; General Maintenance Action
Aircraft; Procedure
On departure from ZZZ I looked at the wing and saw a stream of fuel pouring from the wing. Notified Tower of the need to return immediately. The Tower rolled the firetrucks in response. The problem most likely was an incorrect seating of the fuel cap due to a faulty rubber gasket. In order to prevent a re-occurrence of a similar incident; during 100 hour inspections the gasket in the fuel caps need to be thoroughly inspected. A more in depth preflight; including one that more thoroughly inspects the bottoms of the fuel caps need to be employed in the future with Aztecs. The gaskets on all 4 four tanks are currently being replaced in response to this incident.
A Piper Aztec pilot reported observing fuel streaming from the wing due to a suspected faulty fuel cap gasket.