Narrative:

During climb out from ZZZ at about 15000 ft; we received fuel imbal on EICAS. Fuel quantity in left tank indicated 0 pounds on both EICAS and mfd indication. Fuel totalizer indicated only the right tank quantity. After completing appropriate checklists; we determined returning to ZZZ was the safest course of action. We landed normally in ZZZ. Unknown fuel quantity system malfunction.

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Original NASA ASRS Text

Title: EMB140 FO REPORTS LEFT TANK FUEL QUANTITY INDICATING ZERO PASSING 15000 FEET IN CLIMB. THIS TRIGGERS EICAS FUEL IMBALANCE AND FLT CREW ELECTS TO RETURN TO LAND.

Narrative: DURING CLBOUT FROM ZZZ AT ABOUT 15000 FT; WE RECEIVED FUEL IMBAL ON EICAS. FUEL QUANTITY IN L TANK INDICATED 0 LBS ON BOTH EICAS AND MFD INDICATION. FUEL TOTALIZER INDICATED ONLY THE R TANK QUANTITY. AFTER COMPLETING APPROPRIATE CHKLISTS; WE DETERMINED RETURNING TO ZZZ WAS THE SAFEST COURSE OF ACTION. WE LANDED NORMALLY IN ZZZ. UNKNOWN FUEL QUANTITY SYS MALFUNCTION.

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.