C150 PLT RAN OUT OF GAS 4 MI SHORT OF HIS DEST ARPT AND MADE AN OFF ARPT FORCED LNDG.

Narrative

PLANNED VFR FLT TO ZZZ. OBTAINED WX FORECAST AND WINDS ALOFT FROM WX NETWORK. BASED ON EXTRAPOLATED WINDS FORECAST FOR 7500 FT; FLT PLAN CALLED FOR TOTAL FLT TIME OF 4 HRS AND 10 MINS. BASED ON PLT OPERATING HANDBOOK; FUEL CONSUMPTION AT THAT ALT AT 2500 RPM WOULD BE 4.6 GAL/HR WITH A TOTAL FUEL OF 4.9 HRS. TAKING IN CONSIDERATION OF TKOF AND CLB FUEL BURN; TOTAL ESTIMATED FUEL ON BOARD WAS 4.7 HRS. PERFORMED NORMAL PREFLT INSPECTION OF ACFT WITHOUT ANY ABNORMALITIES NOTED. ENRTE; GND SPD WAS SLIGHTLY LESS THAN COMPUTED USING FORECAST WINDS. DURING STRAIGHT-IN APCH TO RWY 14 AT ZZZ; ENG BEGAN TO SPUTTER AND SHORTLY QUIT. THIS WAS APPROX 4.3 HRS INTO FLT. I IMMEDIATELY LOCATED SUITABLE FIELD FOR LNDG AND ANNOUNCED TO TWR MY INTENTIONS. DURING PITCH UP ATTITUDE; ENG BEGAN TO RUN; BUT SINCE I HAD ENSURED LNDG AT FIELD; I DECIDED TO MAKE PRECAUTIONARY LNDG RATHER THAN ATTEMPT TO MAKE RWY. UNEVENTFUL ENG OUT LNDG PERFORMED. ZZZ TWR CONTACTED VIA CELL PHONE TO ANNOUNCE THAT I WAS SAFE AND ACFT WAS NOT DAMAGED. 4 GALS OF FUEL WAS ADDED AND DURING PREFLT INSPECTION; L FUEL TANK SUMP DRAIN NOTED TO BE LEAKING. AFTER SEVERAL ATTEMPTS TO GET DRAIN TO SEAL; FUEL DRIP WAS CEASED. ACFT WAS FLOWN TO ZZZ AND REFUELED. UPON RETURNING TO FINAL DEST AND HOME ARPT; FUEL TANK SUMP DRAINS REMOVED AND CLEANED BY ACFT MECH. NEW O-RINGS INSTALLED. I HAVE HAD PROBS WITH FUEL DRAIN SUMP VALVES IN THE PAST AND HAVE PAID CLOSE ATTN TO ENSURE THAT THEY WERE SEALED PRIOR TO TKOF; WHICH I'M SURE I DID ON THIS DATE. I BELIEVE THAT A MORE AGGRESSIVE APCH TO REPAIRING/REPLACING THEM TO ELIMINATE POSSIBLE FAILURE WOULD HAVE PREVENTED INCIDENT. IN ADDITION; I BELIEVE THAT A MORE CONSERVATIVE PERSONAL MINIMUM FUEL RESERVE REQUIREMENT FOR SUCH A LONG FLT RATHER THAN THE 30 MINS REQUIRED BY REG WOULD HAVE PREVENTED THIS INCIDENT AS WELL.