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Old 20 January 2003, 04:55   #1
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How muchdoes fuel weigh ?

Subject says it all.

How much does petrol weigh ?
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Old 20 January 2003, 04:57   #2
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7.2 pounds per gallon
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Old 20 January 2003, 05:06   #3
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Which I believe would equate to 0.72Kg/litre for the less wrinkly people here

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Old 20 January 2003, 05:39   #4
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Thanks

Glad I don't have to carry it all in cans to the boat.
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Old 20 January 2003, 05:54   #5
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How much does petrol weigh ?
I dunno mate, but I can tell you it getts heavier the further you have to carry it!

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Old 20 January 2003, 06:03   #6
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John,
I take it i'm a wrinkly too then! a victim of my own insults, great
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Old 20 January 2003, 06:11   #7
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So now I have

bare boat + engine + fuel < max tow limit 4 car

but then we add all the gubbings like

anchors,chain,ski's,lifejackets,beer and of course the weight of the trailer = A lot for a Nissan Micra to pull
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Old 20 January 2003, 06:37   #8
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Mr. Narked might like to comment here......
I was taught, when doing some diving training, in metric, (originally learnt in Imperial, but metric is soooo much easier) that water weighs exactly 1kg per litre.
Now without checking anything, petrol weighs less, but if you include the container....
What I am really getting at is that, if for instance, you have need to carry two 20 petrol cans from the garage to the slipway, near as b****r it, it will be nearly 40kgs. or for the less technical amongst you- bloody heavy!
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Old 20 January 2003, 07:32   #9
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Think I better join a Gym.

Or stick to filling up at Safeway while its on a trailer and cheaper than the fuel barge.
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Old 20 January 2003, 07:39   #10
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I thought water was 10 pounds per 1 gallon! oops there goes my age again!
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Old 20 January 2003, 07:44   #11
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If you need to be really sure about the weight of everything then (assuming you have the time and inclination) you can use bathroom scales.
eg
Your weight and and anchor is 85kg
Your weight alone is say 80kg
Hey presto, a 5kg anchor.

Alternatively, there are publkic weight bridges dotted around or you could use weigh bridges at rubbish tips or gravel merchants to gice you the weight of the trailer full set up.

Tiger
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Old 20 January 2003, 10:16   #12
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Jon
Yes, I thought that water was 10lb per gallon as well.
No doubt some genius can tell us if 10lb = 1 gallon is the same as 1kg = 1 litre.
Who knows maybe it is. Wouldn't that just be a fantastic coincidence?
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Old 20 January 2003, 10:19   #13
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Please note significance

of petrol having less mass than water :

if you do get any condensation in fuel tanks the water will settle to the bottom, the fuel pipe always picks up fuel from the bottom also, a bad combination

good reason to have a fuel / water seperator

Yet fuel vapours will settle to the bottom of a bilge, a bad combination if combined with electrics, batteries, etc

good reason to have a blower for bilges to clear any dangerous fuel vapours
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Old 20 January 2003, 10:25   #14
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Sea Water weighs 1.025Kg / litre
Fresh Water weighs 1.0 Kg / litre

and petrol about 0.825 kg / l

Hence your boat floats lower in fresh water than on the high seas!!
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Old 20 January 2003, 10:36   #15
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And it looked like a simple question!!!

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Old 20 January 2003, 10:51   #16
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This is also the reason when the boat is flooded that the petol tanks try to float out is you didn't tie them down, conversly if you did them could become contaminated with water.
more food for thought - having once sat in a Dell quay dory 13' floating underwater engine still running holding the fuel tank above water after being swamped by some nice person hopeing the engine will keep ging and we can drain out !!
That sounds like a confesional!
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Old 20 January 2003, 10:59   #17
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WOW

All that information from a one liner.

Thanks to everybody for the replies in this thread.

FWIW I wanted to know the weight of the feul so I could workout the weight of the boat when its full of fuel and sat on the trailer. ie: being towed
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Old 20 January 2003, 13:23   #18
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A bit off thread.

But, since it's mentioned here. If you use a blower to clear the bilges, make sure it uses a brushless motor or you may ignite those lovely, heavy petrol fumes. Keep the switch clear too.

No doubt some genius can tell us if 10lb = 1 gallon is the same as 1kg = 1 litre.
Yep, it is.

Cor, I'm a genius. Cool.

JW.
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Old 20 January 2003, 13:34   #19
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Quote:
boat is flooded that the petol tanks try to float out is you didn't tie them down
Thanks for the reminder. I must get tie straps fitted for the Orkney Expedition.

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Old 20 January 2003, 15:01   #20
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Wish

someone would post

" Whats the meaning of life"

if you think this forum is that good at answering questions
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