Narrative:

Shortly after takeoff; received an ECAM warning for a #1 center tank fuel pump low pressure. Performed ECAM; ECAM follow-up and supplemental abnormal handbook procedures. The confign dictated by these procedures resulted in a main tank imbal where only 1 tank was inexplicably feeding both engines. Consulted pilot handbook for approved xfeed procedures. Instituted procedures; corrected imbal but observed left main fuel tank increasing in quantity. Based upon 2 unexplained anomalies (1) tank imbal and later (2) tank quantity increasing; our complement of (3) experienced airbus pilots reached an immediate and unanimous consensus to return to field. Safety of flight was never an issue. Normal uneventful return and landing. This report is being filed under the category of return to field.

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Original NASA ASRS Text

Title: AN A319 #1 CENTER FUEL TANK PUMP PRESS LOW LIGHT PROCEDURES RESULTED IN A FUEL IMBALANCE AND THEN #1 TANK FUEL QTY INCREASING.

Narrative: SHORTLY AFTER TKOF; RECEIVED AN ECAM WARNING FOR A #1 CTR TANK FUEL PUMP LOW PRESSURE. PERFORMED ECAM; ECAM FOLLOW-UP AND SUPPLEMENTAL ABNORMAL HANDBOOK PROCS. THE CONFIGN DICTATED BY THESE PROCS RESULTED IN A MAIN TANK IMBAL WHERE ONLY 1 TANK WAS INEXPLICABLY FEEDING BOTH ENGS. CONSULTED PLT HANDBOOK FOR APPROVED XFEED PROCS. INSTITUTED PROCS; CORRECTED IMBAL BUT OBSERVED L MAIN FUEL TANK INCREASING IN QUANTITY. BASED UPON 2 UNEXPLAINED ANOMALIES (1) TANK IMBAL AND LATER (2) TANK QUANTITY INCREASING; OUR COMPLEMENT OF (3) EXPERIENCED AIRBUS PLTS REACHED AN IMMEDIATE AND UNANIMOUS CONSENSUS TO RETURN TO FIELD. SAFETY OF FLT WAS NEVER AN ISSUE. NORMAL UNEVENTFUL RETURN AND LNDG. THIS RPT IS BEING FILED UNDER THE CATEGORY OF RETURN TO FIELD.

Data retrieved from NASA's ASRS site as of May 2009 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.