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Fuel tank gauge

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marisco View Drop Down
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Post Options Post Options   Quote marisco Quote  Post ReplyReply Direct Link To This Post Topic: Fuel tank gauge
    Posted: 08 Jun 2016 at 9:24pm
My fuel tank gauge is a length of discoloured hose pipe - no longer up the job.

Wondering what gauge system other boats tend to have ?  Someone suggested I could just stick a 'dipstick'  down the fuel cap - but I don't know if there are bends in the pipe ?

And what capacity tank am I likely to have - original from 1977 I think, looks stainless steel ?

And what is typical fuel consumption (I've got a 20HP BUKH) ?

Sorry - too many questions !

Thankyou, Paul
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George Isted View Drop Down
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Post Options Post Options   Quote George Isted Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jun 2016 at 8:36pm
Hi Paul,
if the sighting gauge (posh name for the pipe) is discoloured it's easy enough to replace, there should be a separate stop-cock for the pipe so it can be isolated and removed - just make sure you switch it back on or you will get a false reading (guess how I know!).

The tank is about 45L or 10 gallons if it's the original from 77 - which I expect it is.

Consumption is hard to say because it depends on how much welly you give the engine. My 2GM20 Yanmar uses about 1L/hr at 1800-2000 rpm but this rises to 1.5L/hr at around 2600 rpm (or 5.5kts boat speed with a clean hull). This should give you an indication

Concerto's engine/prop combination seems happiest at around 2200 rpm but all engines will be slightly different.

Other owners with the same BUKH may be able to offer a better guide.
George Isted
www.solentboatbutler.co.uk
Contessa 32 "Concerto"
Co32 Class Measurer and ex Class Captain.
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marisco View Drop Down
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Post Options Post Options   Quote marisco Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jun 2016 at 1:34pm
Many thanks !
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Alastair D Pugh View Drop Down
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Post Options Post Options   Quote Alastair D Pugh Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jun 2016 at 2:42pm
A word of caution - my sight tube was yellowed and hard to gauge so I replaced it during the winter with a clear braided poly one.  It is now even more difficult to gauge the level even with a torch shone on the bulkhead behind.  What is needed is a float and maybe I'll get round to that next winter.

While you are there, look for the tank overflow/breather - i.e. where does the fuel go if you fill the tank too full?
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George Isted View Drop Down
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Post Options Post Options   Quote George Isted Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 2016 at 4:38pm
I use a small torch to help seeing the furl level as suggested by Alastair. With the torch shining aft from ahead of the pipe (hope that makes sense) it's generally possible to see the level.   I now only use white (road) diesel in the tank which makes it a bit harder to spot than red diesel.

Edited by George Isted - 14 Jun 2016 at 4:38pm
George Isted
www.solentboatbutler.co.uk
Contessa 32 "Concerto"
Co32 Class Measurer and ex Class Captain.
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waratah912 View Drop Down
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Post Options Post Options   Quote waratah912 Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jun 2016 at 8:27pm
If you empty the tank, it's worth taking the time to refill it using a 5l container and marking the level for each 5l on the tube. 5l is approx three / four hours motoring, makes the maths easy.
Paul Smith
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Alan Dixon View Drop Down
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Post Options Post Options   Quote Alan Dixon Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 2016 at 4:29pm
Measure the tank in metric.
one litre = one cubic CM 
you can then calculate the volume of the tank and the graduations against the sight glass

Alan Dixon "Charlotte"
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waratah912 View Drop Down
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Post Options Post Options   Quote waratah912 Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 2016 at 4:46pm
er - that would result in a rather large over estimation of the tank capacity 
http://www.metric-conversions.org/volume/liters-to-cubic-centimeters.htm
Paul Smith
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Alan Dixon View Drop Down
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Post Options Post Options   Quote Alan Dixon Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 2016 at 5:04pm
Sorry decimal point in wrong place 1ltr of course = 1000 cm3
Alan Dixon "Charlotte"
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