MOONEY -20E ENG FAILURE JUST AFTER TKOF PGD. PLT LANDS STRAIGHT AHEAD.

Narrative

NEWLY BOUGHT ACFT JUST OUT OF MAINT. I TOOK IT FOR A TEST FLT FROM VENICE; FL; TO MAKE SOME TOUCH AND GOES IN PUNTA GORDA'S CHARLOTTE COUNTY ARPT. ON THE WAY I PRACTICED SOME STEEP TURNS AND STALLS. I WAS USING R WING FUEL. FOR MY SECOND TOUCH AND GO I SWITCHED TANK ON DOWNWIND (TO MAINTAIN LATERAL BAL) ABOUT 1/2 HR INTO THE FLT. UPON TKOF ON THAT SECOND TOUCH AND GO THE ACFT'S ENG FAILED 200 FT ABOVE GND. I IMMEDIATELY PITCHED DOWN TO MAINTAIN LNDG SPD (80 MPH) AND LANDED ON THE LITTLE THAT WAS LEFT OF THE RWY AND ROLLED OUT ON THE GRASS BEYOND IT. BY THE TIME I CAME TO A STOP I WAS 2 FT FROM FENCE (ARPT BOUNDARY). NO DAMAGE. AFTER INSPECTION OF THE ENG BY MECH; IT APPEARED THE R TANK CONTAINED A LOT OF WATER (SEVERAL GALS). IT APPEARED THE ACFT HAD BEEN SITTING OUTSIDE THE MAINT HANGAR DURING A VERY STRONG DOWNPOUR AND ITS L FUEL CAP IS INEFFICIENT AND LET THE RAINWATER IN. I HAD SUMPED THE ACFT AND NOTICED NOTHING ABNORMAL BUT I SHOULD HAVE SHAKEN THE WINGS TO FREE WATER FROM RIB DURING PREFLT. AS IT TURNED OUT THE STEEP TURNS DID THE JOB OF BRINGING THE WATER NEAR FUEL LINE INTAKE. CONCLUSION: ALWAYS SHAKE WINGS FROM TIP BEFORE SUMPING. BE PARTICULARLY ALERT IF ACFT WAS EXPOSED TO RAIN. VERIFY INTEGRITY OF FUEL CAPS.