Fuel flow rate of Volvo Penta MD22P-B 2-litre

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Following on from this thread where I was asking if a Racor 120AT Diesel Fuel Filter would have enough throughput at 57 litres per hour: http://www.ybw.com/forums/showthread.php?374311

I have just disconnected the return pipe on my Volvo Penta MD22P-B and timed the return flow at 1000 RPM: in 5 minutes I got 1.5 litres. So that's 18 litres / hour, plus perhaps 2 litres per hour that is being used, total about 20 litres per hour.

The return rate didn't seem to noticeably increase at 2000 RPM, I wonder if I need to check this.
 
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