Narrative:

At about 50 minutes into flight just north of ZZZ1 at FL350 we experienced a loss of our left fuel quantity gauge; and fuel totalizer. After conferring with QRH; dispatch; and [technical support maintenance control]; it was determined that there was no inflight reset; and we did not feel comfortable continuing an atlantic crossing without knowing the fuel quantity. We [requested priority handling]; notified crew; and diverted to ZZZ where we made a safe overweight landing.

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Original NASA ASRS Text

Title: B757 First Officer reported the failure of the fuel quantity indicator; the return to departure airport and overweight landing.

Narrative: At about 50 minutes into flight just north of ZZZ1 at FL350 we experienced a loss of our Left Fuel quantity gauge; and fuel totalizer. After conferring with QRH; Dispatch; and [Technical Support Maintenance Control]; it was determined that there was no inflight reset; and we did not feel comfortable continuing an Atlantic crossing without knowing the fuel quantity. We [Requested Priority Handling]; notified crew; and diverted to ZZZ where we made a safe overweight landing.

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.