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Old 27 September 2011, 07:56   #21
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Quote:
Originally Posted by Nos4r2 View Post
Is the main tank lower than the 25 litre tanks?

Here's what I think happened-assuming the main tank is lower than the 25 litre tanks.

You were drawing from the main tank 'til the fuel slowly syphoned into the main tank from the 25L tank as the valve wasn't open fully.

You then started drawing air into the lines from the empty reserve tank, creating an illusion of being out of fuel.

<edit> just seen the second page. I think you're right.
Im going with this theory, and in a way its reassuring as I was gutted that my fuel efficient engine was costing 260l to cover 82 miles in what was really flat calm conditions, ok yes we were gunning the engine as much as it would go but I still would like to think it was better than that.
SO now it looks like 150l is more realistic.
And yes the 2 external tanks sit on the deck and the internal is buried somewhere under the console with the pickup being at the bottom. I will dig out the build thread that shows the fuel set up
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Old 27 September 2011, 07:59   #22
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Rob & Nos have to be Right!

The 25L tank (not in use) was discovered empty after 3 hours running. Obviously it was slowly releasing SOME fuel to either the engine or the main tank via the switch. Once this fuel was gone, air was then introduced to the fuel lines, stopping the engine. The fuel was later found to be in the main tank..
so where did the 210 L bought in france go... or did they screw over les ros beouf
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Old 27 September 2011, 08:04   #23
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Some pics of the fuel set up

http://www.rib.net/forum/attachment....9&d=1244666283
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Old 27 September 2011, 08:06   #24
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so where did the 210 L bought in france go... or did they screw over les ros beouf
some of it went travelling over to Braye from Cherbourg, and mucking around while we were there, Diving etc.
I filled up with MarineBrayce in the morning of departure. Which seen me leave with 260l total on the boat
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Old 27 September 2011, 08:15   #25
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I'd get a fuel flow meter and just see what it's drinking at different rpm and boat loads etc so you know for future use

Jim
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Old 27 September 2011, 08:29   #26
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some of it went travelling over to Braye from Cherbourg, and mucking around while we were there, Diving etc.
I filled up with MarineBrayce in the morning of departure. Which seen me leave with 260l total on the boat
My point is - you had 210 L of fuel tank space. You bought 210 L in france, so you were indeed empty in Cherbourg - not only partially empty with air in the fuel line as has been suggested. If you still have 50+L in your main tank but couldn't get it out then you couldn't have bought 210 L in france as you had nowhere for it to go...
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Old 27 September 2011, 13:01   #27
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I'd get a fuel flow meter and just see what it's drinking at different rpm and boat loads etc so you know for future use

Jim
I had one of those fitted, a Navman job, but it broke on the trip and according to the Ribshop (I just had the boat serviced) its dead and they no longer make that brand. So I have a nice dial that does nothing on my console
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Old 27 September 2011, 13:03   #28
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Quote:
Originally Posted by Polwart View Post
My point is - you had 210 L of fuel tank space. You bought 210 L in france, so you were indeed empty in Cherbourg - not only partially empty with air in the fuel line as has been suggested. If you still have 50+L in your main tank but couldn't get it out then you couldn't have bought 210 L in france as you had nowhere for it to go...
Ah no - sorry for the confusion, I am not debating the trip out there, sure as eggs are eggs I ran out.
Where the confusion came from was on the return trip where I had 260l and emptied what I presumed was all fuel, but 3 weeks later I fill the tank up and can only get 50l onboard indicating I still had 110l in
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Old 27 September 2011, 15:37   #29
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Originally Posted by Rob Jones

Ah no - sorry for the confusion, I am not debating the trip out there, sure as eggs are eggs I ran out.
Where the confusion came from was on the return trip where I had 260l and emptied what I presumed was all fuel, but 3 weeks later I fill the tank up and can only get 50l onboard indicating I still had 110l in
Its obvious then. Somebody is filling your tank for you :whistling

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
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Old 27 September 2011, 17:12   #30
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Its obvious then. Somebody is filling your tank for you :whistling

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
Well they are welcome to keep filling - hopefully they can top it off before the weekend as I might run over to Calais
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