Erj-145 flight crew reported fuel quantity indication malfunctions during a diversion; that forced t...

Narrative:

Weather was few 900; and 4100 ovc. After two attempts; we would break out of the clouds at minimums; but with the 1 3/4 mile visibility we could not see the runway in time to allow for a safe landing. After the 2nd missed approach; our fuel was 4400 lbs. The divert fuel was 4100 and the field conditions were getting worse. We decided to divert. After being passed to the 2nd departure control (climbing 10;000 up to 20;000); the right fuel tank went all amber dashes. The left tank showed 1730 pounds. This was lower than the final divert number and half of what the fuel should have been. Without knowing the actual fuel qty; [advised] low fuel [with ATC] and with a request to land at the closet suitable airport. With the options and distance and runway information given; going back to [our original destination] was the best choice. ATC said ATIS was 500 broken and calm winds. We requested the ILS to ensure we could get in. In the turn back; both tanks went dashes for a few seconds. After leveling; they both came back showing 3400 pounds on board. But; immediately; the right tank went back to all dashes. After landing; the left tank showed 1490 lbs; the right tank showed amber dashes. I rebooted the airplane to see if the fuel numbers would change. The left tank showed 1610 and the right was 1490. (Note; the left tank showed 1490 after landing; now showing 1610).

Original NASA ASRS Text

Title: ERJ-145 flight crew reported fuel quantity indication malfunctions during a diversion; that forced them to return to the original destination airport.

Narrative: Weather was few 900; and 4100 OVC. After two attempts; we would break out of the clouds at minimums; but with the 1 3/4 mile visibility we could not see the runway in time to allow for a safe landing. After the 2nd missed approach; our fuel was 4400 lbs. The divert fuel was 4100 and the field conditions were getting worse. We decided to divert. After being passed to the 2nd departure control (climbing 10;000 up to 20;000); the right fuel tank went all amber dashes. The left tank showed 1730 pounds. This was lower than the final divert number and half of what the fuel should have been. Without knowing the actual fuel QTY; [advised] low fuel [with ATC] and with a request to land at the closet suitable airport. With the options and distance and runway information given; going back to [our original destination] was the best choice. ATC said ATIS was 500 broken and calm winds. We requested the ILS to ensure we could get in. In the turn back; both tanks went dashes for a few seconds. After leveling; they both came back showing 3400 pounds on board. But; immediately; the right tank went back to all dashes. After landing; the left tank showed 1490 lbs; the right tank showed amber dashes. I rebooted the airplane to see if the fuel numbers would change. The left tank showed 1610 and the right was 1490. (Note; the left tank showed 1490 after landing; now showing 1610).

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.

Attributes
ACN	1511229
Time
Date	201801
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Fuel Quantity-Pressure Indication
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter Fuel Issue Inflight Event / Encounter Weather / Turbulence

Erj-145 flight crew reported fuel quantity indication malfunctions during a diversion; that forced them to return to the original destination airport.