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Old 26 September 2011, 16:41   #11
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Hi there Ian, (you can tell Jono his old boat is doing the runs it was designed for.
No chance that I could of started with less than 160l as it was empty and I filled it in Langstone, the pump wouldnt let me do more than a 100l so I had to do a couple of payments.
I honestly think the diverter valve that switches between internal and external tanks was between two settings. The engine sucked down on the 25l external tank and then about 50 or litres on the internal before getting some air (which made me think I had ran out)
that in theory would of been 70/80l which you would expect to get through in 60miles (3 hours).
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Old 26 September 2011, 17:30   #12
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How much fuel did it take on the otherside to refuel?
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Old 26 September 2011, 17:48   #13
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I'd be looking at the fuel tap, I never did like multi position ones. If you had an intermitent air leak from either external tanks when either one was exhausted it could have introduced air in to your fuel line and might have acted as if your main tank was empty when in actual fact you still had fuel to burn. I would look at a more fool proof design for future trips, like physicly swapping over pipes when changing tanks.
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Old 26 September 2011, 18:19   #14
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How much fuel did it take on the otherside to refuel?
When we got to within a mile of France we had truly used all the fuel avaialble, so in Cherbourg I bought another 210l for the short hop over to Alderney and then bought the extra tanks and fuel for the return.
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Old 26 September 2011, 18:41   #15
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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.
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Old 26 September 2011, 18:44   #16
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When we got to within a mile of France we had truly used all the fuel avaialble, so in Cherbourg I bought another 210l for the short hop over to Alderney and then bought the extra tanks and fuel for the return.
So in Cherbourg you had empty capacity for 210L. That would be 160 L internal + 2x25 L external. i.e. your tanks WERE empty.
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Old 26 September 2011, 19:28   #17
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With hindsight my biggest regret of the nite was that I didnt use the oars to row in,
That's exactly what I was thinking of.

We used to do Rye-Dieppe and we broke down just 2 miles off Hastings. We did use the oars, but it only helped us not going further into the channel, until some fishing boats helped us...

You seem to have burnt too much fuel for that journey, 210ltr/82 miles? or am I confused?
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Old 27 September 2011, 03:48   #18
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Have you checked the main tanks breather is clear, was there a whoosh of air when you undid the filler cap. If the breather was blocked, it would create a vacuum that would give the same symptoms as running out of fuel.
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Old 27 September 2011, 05:47   #19
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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.

I'l say test the setup again with a full 25L tank and the switch in the correct position. If the tank remains full and the engine runs OK at WOT, you're good. I used a pair of those brass fuel switches for a few years and when I sold them they were 11 years old and they hadn't ever malfunctioned.
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Old 27 September 2011, 07:52   #20
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That's exactly what I was thinking of.

We used to do Rye-Dieppe and we broke down just 2 miles off Hastings. We did use the oars, but it only helped us not going further into the channel, until some fishing boats helped us...

You seem to have burnt too much fuel for that journey, 210ltr/82 miles? or am I confused?
You are right in that I burnt too much fuel, but to be fair the boat was loaded super heavy and the seas were really large, we could only average 8knots and we were at sea for 10 hours. So its more like after 10 hours we got through 210l
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