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Old 10-05-2016, 20:52   #1
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Actual fuel tank capacity - L380

I know that the current Lagoon specs say that the L380 is supposed to have 100 litre fuel tanks, but I've questioned this for quite a while on our 2004 #421. Going by how much I've had to put in when the gauges read half full etc.

So I measured the external dimensions of the underfloor tanks (see below) & as far as I can calculate (I could be wrong in my maths) our tanks are actually 140 litres each. That's 40% more, giving a conservative extra 130 NM range!

Seabreeze is an ex charter boat & maybe they put in larger tanks because of that.

Has anybody else calculated / measured their fuel tanks capacity?





Dave
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Old 11-05-2016, 10:08   #2
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Re: Actual fuel tank capacity - L380

Baffles inside tank? Maybe some structural stuff that might take up some volume.
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Old 11-05-2016, 17:21   #3
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Re: Actual fuel tank capacity - L380

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Baffles inside tank? Maybe some structural stuff that might take up some volume.
Yeah I thought of baffles. But didn't believe they would take 30 to 40 litres. Ah well.

Has anybody actually filled their tanks from empty?

I will continue to estimate range based on 100 litres & hopefully will mean I have some in reserve if ever the day comes when I get it wrong.

Dave
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Old 11-05-2016, 17:25   #4
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Re: Actual fuel tank capacity - L380

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Originally Posted by gspeak View Post
Yeah I thought of baffles. But didn't believe they would take 30 to 40 litres. Ah well.

Has anybody actually filled their tanks from empty?

I will continue to estimate range based on 100 litres & hopefully will mean I have some in reserve if ever the day comes when I get it wrong.

Dave
Dave your measurements seem correct. But forget the damn fuel gauge because of the uneven nature of the bottom of the tank. Start using fuel consumption based on engine hours and then you'll know for sure.
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Old 12-05-2016, 09:08   #5
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Re: Actual fuel tank capacity - L380

I have measured many fuel tanks in my surveys.
I see only one side measurement and one end, not both ends.
Often a tank is shallower at one end than the other as it is made to follow the bottom of the hull.
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Old 12-05-2016, 10:12   #6
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Re: Actual fuel tank capacity - L380

Only real way I know of to determine usable fuel is to run the engine out of fuel and refill the tank, cause I suspect its usable fuel your wanting to know, not tank capacity
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Old 05-06-2016, 18:52   #7
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Re: Actual fuel tank capacity - L380

give sunsail a call or one of the charter operators at airlie
we forever hear them on the vhf ferrying fuel to stranded charter customers
no doubt they would have fuel useage per hour under what condition worked out
careful that you don't ask the bloke that does deliveries of fuel, food, beer etc. with a large jet ski as he may give you mis-information and his phone number
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Old 07-07-2016, 15:11   #8
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Re: Actual fuel tank capacity - L380

i will check the measures on our tanks they are to be 130 liter . i will put out pictures on the 19.July. Ours is hull 637 from 2011. and i have filled them with 125 liter once, and it was not empty.
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Old 07-07-2016, 17:42   #9
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Re: Actual fuel tank capacity - L380

How many liters/gallons your tank will hold is not nearly as important as how many liters/gallons your fuel system will pick up from the tank.
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Old 07-07-2016, 17:51   #10
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Re: Actual fuel tank capacity - L380

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How many liters/gallons your tank will hold is not nearly as important as how many liters/gallons your fuel system will pick up from the tank.
Good point, and also how much it can pick up without sucking some air while the tank constantly moves from level position as the water and wind act on the hull. Less in cats than mono's but still needs taking into account imho.
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Old 19-07-2016, 10:53   #11
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Re: Actual fuel tank capacity - L380

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i will check the measures on our tanks they are to be 130 liter . i will put out pictures on the 19.July. Ours is hull 637 from 2011. and i have filled them with 125 liter once, and it was not empty.
then i have done it. mine is 25cm deep in center, and 103cm long, and 86cm wide. and from the factory it will take 130 liters.
the depth on 25cm is in the front, what it is in the back under the bed ?? i dont know. cant get to it.
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