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Old 16 July 2016, 13:52   #1
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Fuel Consumption Suzuki 225 Four Stroke

Hi,

I recently installed the Suzuki engine interface to Chartplotter and have fallen foul to the issue where it give the wrong data... I am on the case with that but wondered if my actual fuel consumption sounds high.

The previous owner had the injectors cleaned a couple of years ago as it started using a lot more fuel and it might be in my head but think it is doing the same, that or the gauge reading 40 ptrs and hour at idle has addled my brain!

The boat is Cobra 755 with Suzuki 250 - Filled to brim with 260 Ltrs of fuel, 2 people up and about 25 litres of water and various bits of kit

I did the following trips from the Hamble before refuelling

1. 20 Min running time trip - 3.1NM
Hamble to Southampton Water potter out at 6 knots then play between 20-35 knots and back in - Flat water

2. 40 Min running time - 11NM
Hamble to Cowes and Back, force 5 seas, cruising at about 20 - 25knots

3. 35 mins running time - 3.5NM
Hamble to entrance of southampton water at 25 knots with 1 or 2 mins at 40 knots then potter back slowly at 4-5 knots alongside sailing boat!

Total fuel 47Ltrs and distance covered 17NM

Based on that i wouldn't even make it across the channel :-(

Does it seem high to you all?
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Old 16 July 2016, 14:00   #2
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Just thought, don't know if this is related but it starts quite badly and often I need to give it some neutral revs to get it to start, better cold than warm.. once running it sounds perfect and very smooth
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Old 16 July 2016, 14:00   #3
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Please search for topic. You need to firmware flash the suzuki cable to get accurate readings
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Old 16 July 2016, 14:02   #4
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86.2 Lt/ hour WOT based on that I would say yes
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Old 16 July 2016, 14:02   #5
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I mentioned I know about the firmware issue and am on the case and should have a Lowrance HDS unit next week to connect to downgrade to 2.3 but my question was an actual fuel consumption issue not what the guage reads... that says I have done about 400 litres in that time!
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Old 16 July 2016, 14:09   #6
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Fimware flash it, you are using too much yes.

Or do it the proper way and brim it after a run.
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Old 16 July 2016, 14:22   #7
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Thats why I need the HDS unit, you can't do it from Raymarine stuff! So annoying!

I did the brim to brim thing.. thats how I know the 47 ltrs - that was not from the chartplotter that was actual fuel used for those trips.

Oh Joy, so looks like I have an issue that needs to be fixed as it is costing me too much to run and fixing it will also probably cost too much too.. Got to love boats :-)
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Old 16 July 2016, 14:31   #8
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Originally Posted by dubrus View Post
Fimware flash it, you are using too much yes.

Or do it the proper way and brim it after a run.
But dubrus that is what the OP says he did to get his 47 L figure (after 17 NM).

It does *seem* high. But then very simply a 250HP engine is going to burn a lot of fuel. At wide open throttle you might expect the engine to burn something like 80-100L/hr. At cruising speed perhaps 1/2 that. All that time at lowish speed isn't necessarily more efficient either if you are half on the plane you are driving up hill for nothing.

You are using just under 30L/hr which doesn't sound too bad...
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Old 16 July 2016, 14:35   #9
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Thanks Poly... Think I might have a nice cruising run down the solent for an hour or two to give me a proper figure...(guess if i run out of fuel that answers the question!)

Hopefully it is just knowing there was an issue in the past means I am over thinking it..
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Old 16 July 2016, 14:59   #10
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My 200 burns 0.9l per statute mile if that is of any use as a guide ish.
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