The MERC pump may work as it would be meant for a loopers lower crankcase pressure. I know I tried a regular OMC crossflow pump on my 140 looper, and it worked great until it hit 4000 RPM's, then the pump just quit working. The VRO pumps are designed to work well with virtually no crankcase pressure at all, and is why they work on the loopers.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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