ATX BE-18 RETURN LAND MANDATED BY AN INFLT ENG SHUTDOWN. FUEL CONTAMINATION.

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I ARRIVED AT THE ARPT AT XX30 FOR MY MORNING RUN TO MONROE. I RECEIVED MY WX BRIEF FROM NASHVILLE AFSS. THE FORECAST FOR MONROE WAS TO BE 5 BROKEN 5F UNTIL 1600Z. I THEN SELECTED JACKSON AS MY ALTERNATE. AT XX45 I STARTED MY WALK AROUND INSPECTION OF BE-18. TWILIGHT WAS JUST BEGINNING. I STARTED INSIDE THE COCKPIT; RELEASING THE CTLS; CHKING FUEL LEVEL (FULL MAINS; FULL AFT AUX TANKS); EXTENDING FLAPS AND CHKING BATTERY PWR. THE REST OF THE WALK AROUND WAS ROUTINE AND BY THE CHKLIST. AFTER CHKING THE GASOLATOR ON THE L ENG I DRAINED THE L MAIN. NOTHING SEEMED ABNORMAL; SO I CONTINUED THE PREFLT. AFTER LOADING IN WHICH I HAD 390 LBS IN ZONE B; AND 302 LBS IN ZONE C; I SECURED THE LOAD WITH THE NET; AND GAVE A COPY OF MY MANIFEST TO MR X; THE SUPVR ON THE MORNING SHIFT. I STARTED THE L ENG; THEN THE R AND PROCEEDED TO ENGAGE THE GENERATORS AND ELECTRICAL EQUIP. I LISTENED TO THE ATIS BROADCAST WHICH WAS CALLING 2 OVCST 1/2F. I RECEIVED TAXI AND IFR CLRNC FROM GND CTL AND PROCEEDED TO RWY 15R FOR DEP. AT THE DEP END OF RWY 15R I THEN PROCEEDED TO DO THE PRETKOF CHKLIST AND RUNUP. AGAIN NOTHING SEEMED ABNORMAL. UPON DEP I WAS GIVEN A HDG OF 180 DEGS AND CONTACT DEP CTL. AFTER SWITCHING TO DEP; I WAS GIVEN A HDG OF 270 DEGS AND CLRED TO 3000 FT MSL. CLBING THROUGH 1300 FT I TURNED OFF THE ELECTRIC FUEL PUMPS AND IT WAS THEN THE L ENG LOST PWR. I CONTACTED DEP CTL AND RPTED THE PWR LOSS ON THE L ENG AND THAT I WAS ATTEMPTING TO RESTART. DEP ASKED HOW MUCH FUEL AND NUMBER OF PERSONS ABOARD; AND MY INTENTIONS. I SAID THAT I WANTED TO GET SOME AL THEN MAKE SOME DECISIONS. I WAS NEVER ABLE TO GAIN ALT WITH PWR SET AT 32 INCHES MAP AND 2100 RPM. I WAS ASKED IF I WANTED THE ASR APCH OR AN ILS TO RWY 15L. I ELECTED TO DO THE ILS BECAUSE I NEVER WOULD HAVE HAD CHANCE TO SEE THE RWY WITH THE ASR APCH. THE CTLR VECTORED ME FOR A 5 MI FINAL TO RWY 15L AND I KNEW THAT I WAS GOING TO INTERCEPT THE LOC INSIDE THE FINAL APCH FIX. I STARTED DOWN THE GS BUT A LITTLE TOO QUICKLY. I GOT BELOW THE GS BUT WAS NEVER ABLE TO GET BACK ON THE GS AND I RPTED THIS TO THE CTLR. AS I GOT DOWN TO DECISION HT I WAS BELOW THE GS AND RPTED THAT I COULDN'T HOLD IT; MEANING I COULDN'T HOLD THE ALT. IT WAS THEN THAT I SAW THE RWY AND RPTED SUCH AND MADE AN UNEVENTFUL LNDG. IT WAS LATER WHEN I FOUND OUT THAT THERE HAD BEEN SUFFICIENT WATER TO FILL THE GASOLATOR AND CARB BOWL TO CAUSE FUEL STARVATION. ALTHOUGH I FOLLOWED NORMAL PREFLT PROC AND WAS NOT REMISS IN MY DUTIES; I HAD NO REASON TO BELIEVE THE LIQUID COMING OUT OF THE L MAIN TANK WAS WATER AND NOT FUEL.