Does any one have a fuel system diagram for a 1977ish with 454 and two factory installed 50gal. tanks? Single switch left or right with two valves?

ARE YOU SURE YOU HAVE 2 VALVES I FIGURED OUT MY PROBLEM IN ABOUT AN HOUR.AFTER I LEFT IT AT THE SHOP FOR 2 WEEKS.MY PROBLEM AND I HOPE THIS IT HELPFUL WAS,WELL COUPLE OF THINGS,FIRST I FOUND THE REAR TANK DID USE A LIFT PUMP(NO POWER WIRE CUT)SECOND AT ONE POINT IN TIME SOME ONE CHANGED THE SWITCHING VALVE AND HOOKED IT UP SO THAT WHEN THE LIFT PUMP WAS RUNNING THE VALVE WAS CLOSED.THE SHOP I HAD IT TO HAD SWITCHED THE RETURN LINES AROUND CAUSING THE LIFT PUMP TO SEND FUEL THROUGH THE RETURN LINE OVER FILLING THE FRONT TANK AND SEND FUEL TO THE PURGE CANISTER.SO MAKE SURE WHEN YOUR TANK SWITCH IS ON LEFT OR RIGHT THE SWITCHING VALVE IS OPEN TO THAT SET ON TANK LINES-GOOD LUCK

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Originally posted by eric:
Does any one have a fuel system diagram for a 1977ish with 454 and two factory installed 50gal. tanks? Single switch left or right with two valves?