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Old 15 July 2018, 04:49   #1
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Fuel evaporating?

Not weather + under deck fuel tank with breather = fuel evaporation?

When we got home from Ireland we topped the tank off and found there was a circ 40litre discrepancy between what the fuel manager thought we had and what was actually in there. The last time we topped the tank off was on arrival at ERR and since then we've filled up with cans. I can see us having a litre less here and there from cans but I'm struggling to explain 40litres.

I'm also thinking that having topped the tank off and left in Wales it now busy evaporating again.

Anyone any thoughts?
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Old 15 July 2018, 04:59   #2
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You would be going some to lose 40 litres on evaporation Dan, there would be a fuel haze around you over what approx 12 weeks or so? That's 3 litres a week yikes. More likely fuel manager is playing up?
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Old 15 July 2018, 05:36   #3
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Did you add the fuel to the fuel manager the previous time you filled up?
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Old 15 July 2018, 05:42   #4
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Anyone any thoughts?
Siphoning? Is she secure?
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Old 15 July 2018, 05:56   #5
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I suspect it's a combination of factors adding up. I always add the partial fill to the fuel manager and to get an error in that direction I'd have had to add a fill twice. I doubt siphoning, unless someone did it on the car deck of the ferry. It was afloat the rest of the time. I'll just need to keep monitoring it.
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Old 15 July 2018, 06:29   #6
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I suspect it's a combination of factors adding up. I always add the partial fill to the fuel manager and to get an error in that direction I'd have had to add a fill twice. I doubt siphoning, unless someone did it on the car deck of the ferry. It was afloat the rest of the time. I'll just need to keep monitoring it.


I always fill mine completely rather than doing a partial fill, it removes the chance of error.
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Old 15 July 2018, 06:38   #7
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Yeah, I prefer that to but it does mean you're lugging around more fuel than you need a lot of the time. She's noticeably more sprightly onto the plane with 100 litres in than 180. It also means towing it to a garage. I think I'll do that over the next few trips though to keep an eye on the fuel manager.
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Old 15 July 2018, 06:42   #8
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Yeah, I prefer that to but it does mean you're lugging around more fuel than you need a lot of the time. She's noticeably more sprightly onto the plane with 100 litres in than 180. It also means towing it to a garage. I think I'll do that over the next few trips though to keep an eye on the fuel manager.


Other thing to keep an eye on is your fuel economy figure from the fuel manager. Make sure it's sensible, if it's suddenly saying you're doing 3nm/l, it may have lost its calibration. I'd expect something around 1nm/l
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Old 15 July 2018, 06:43   #9
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Someone got a badly calibrated pump? Or have you at some point set your tank as “full” on the management software but actually not been sitting level and had an air void?
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Old 15 July 2018, 06:45   #10
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Another thought, have you got a bilge full of fuel????
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