B737 CAPT REPORTS FUEL SPILL AT THE GATE THAT HE LEARNS OF AFTER THE FACT.

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WE WERE SITTING AT THE GATE; PLANE WAS ALMOST FULLY LOADED AND MAINT WAS WORKING A PROB WITH THE ACFT WHEN WE (THE FLT DECK CREW) NOTICED THAT A FIRE TRUCK PULLED UP BTWN THE ADJACENT GATES. WE COULD NOT SEE WHAT THE FIRE TRUCK WAS DOING BECAUSE OF THE JETWAY BUT WE THOUGHT IT WAS PULLING UP FOR THE OTHER ACFT. WE DID NOT THINK ANYTHING ABOUT IT BUT SAW A LOT OF WATER ON THE RAMP. WE FOUND OUT LATER THAT WE HAD A LARGE FUEL SPILL THEY SAID ABOUT 80+ GALLONS. OPS KNEW OF THE FUEL SPILL; THE RAMPER(S) KNEW OF THE FUEL SPILL; THE GND OPS SUPVR KNEW OF THE FUEL SPILL BUT NO ONE TOLD THE FLT CREW. NO ONE. WOULDN'T IT BE NICE IF IT WAS RPTED TO THE FLT CREW SO THEY COULD ANSWER ANY QUESTIONS FROM THE FLT CABIN CREW OR PAX. I THINK THERE IS A REAL PROB HERE AT OUR COMPANY AND IT IS SYSTEMIC. WHAT IF A PAX PANICKED AND OPENED AN OVERWING EXIT BECAUSE OF WHAT THEY SAW. THERE SHOULD BE A PROPER PROC IN PLACE TO AVOID SUCH UNCERTAINTY AND THE FLT CREW SHOULD BE IN THE LOOP. PROC; PROC; PROC. GET ONE IN PLACE AND USE IT.