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Old 04 June 2010, 02:54   #1
Country: UK - England
Town: chelmsford
Boat name: Danjo
Make: Yam 500r
Length: 5m +
Engine: yamaha 90A
Join Date: Jun 2010
Posts: 1
yam 550r how far will it go

i have recently bought a yam 550r rib with a 90hp 2 stroke yamaha outboard i generally only use it for playing around on our local river but hope to do some longer cruises of 50-60 miles or more with a powerboat club on the south coast. nobody seems to know if i have the fuel capacity and usage to do longer trips the inbuilt tank only seems to hold 60 litres or so and the gauges seem to be a bit naf but the manufacturer says it is a 100 litre tank on board.
any ideas would be great ?

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Old 04 June 2010, 03:12   #2
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Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,009
Most people seem to get roughly 1 NM/L from their ribs (almost regardless of engine and boat size) when cruising. Rough weather or a throttle happy skipper will use more (or if you are slower than everyone else and have to run full throttle to keep up).

People generally allow 20-30% spare fuel capacity, in case of miscalculation, delays, needing to divert to another port etc. So even if you do manage to cruise a 1 NM/L you won't have any spare capacity if your main tank is only 60L. I'd take a standard portable fuel tank (27L?) along as spare capacity.

In terms of working out the capacity of your fuel tank you can obviously run it till empty and then refill noting how much is required to fill it. A wooden stick dipped in the tank before and after will then show the levels of the full and empty tank (mark these by cutting notches not pen which will come off in petrol). Bear in mind that the tank may not be completely empty (and if you are only getting 60L out of a 100L tank this may well be the case) if (a) the pickup pipe doesn't go right to the bottom (b) the pickup pipe is at one end of the tank and the boat doesn't run flat. You can then measure off this stick on each trip (assuming your tank is reasonably "regular" in shape and get a more accurate idea of fuel consumption on each trip.
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Old 04 June 2010, 10:14   #3
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
I wouldn't worry too much about the fuel gauge being off: Boats are pretty notorious for having inaccurate fuel gauges. A long thin tank coupled with a rocking, pitching platform make it tough to get a sensor that will show even close to what's in there.

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