M20 ENGINE FAILS ON LNDG ROLL OUT. PLT SUSPECTS FUEL STARVATION.

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CHAIN OF EVENTS: ACFT ENG STOPPED UPON LNDG ROLLOUT. ENG WOULD NOT RESTART. PREFLT INCLUDED VISUAL INSPECTION OF FUEL AND FULLEST TANK (L) WAS SELECTED FOR 20 NM FLT. ESTIMATED FUEL AVAILABLE WAS 2 HRS (1 HR PER TANK) BASED ON PREVIOUS FLTS; FUELINGS; AND FUEL GAUGE READINGS. AFTER INCIDENT; ACFT WAS REFUELED AND THE L TANK TOOK 19 GALLONS OUT OF 26 USABLE. THERE SHOULD HAVE BEEN 7 GALLONS REMAINING OR ABOUT 40 MINS FLYING TIME. POSSIBLE CAUSE: MOONEY'S SIT NOSE HIGH ON THE GND AND I BELIEVE THE FUEL REMAINING SHIFTED TO THE REAR OF THE TANK THUS UN-PORTING THE ENG FUEL FEED LINES LEADING TO FUEL STARVATION. I WILL NEED TO VERIFY THIS THEORY. CONTRIBUTING FACTOR: RELYING ON FUEL CALCULATIONS RATHER THAN ADDING A KNOWN QUANTITY OF FUEL. FUEL GAUGES ARE INACCURATE. 'NOSE HIGH' ATTITUDE OF MOONEY ACFT DURING GND OPS. HUMAN PERFORMANCE FACTORS: FELT RUSHED AS MECH WHO JUST PERFORMED ANNUAL WAS WAITING ON ME TO LEAVE. RELUCTANCE TO REFUEL ACFT AS THIS WOULD HAVE REQUIRED TAXI TO SELF SERVE FUELING AND A 'HOT START' OF THE ACFT. MOONEY'S ARE NOTORIOUS FOR DIFFICULT HOT STARTS. I FELT I HAD ENOUGH FUEL TO MAKE THE SHORT FLT. CORRECTIVE ACTIONS: ALWAYS KNOW HOW MUCH FUEL (IN GALLONS) IS AVAILABLE EITHER THROUGH REFUELING OR USING THE CALIBRATED PIPETTE WE MADE. DON'T LET EXTERNAL FACTORS INFLUENCE YOUR DECISION (HOT START PROBS; AND THE WAITING MECH). FIND OUT IF 'USABLE' FUEL INCLUDES TAXI OPS AS WELL AS INFLT.