The Triumph Dolomite Club - Discussion Forum

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 Post subject: leaded fuel
PostPosted: Sat Jun 23, 2018 6:22 pm 
my 1500 fwd has had a tank full of leaded petrol in it since it went out of fashion. it hasnt gone like jelly, its still in a liquid state (i looked in the tank) but am i best to drain it out and replace it with unleaded - if so what additive to i put in with the unleaded fuel and in what amount. thanks


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 Post subject: Re: leaded fuel
PostPosted: Sat Jun 23, 2018 7:17 pm 
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Location: Filey, North Yorkshire
If it ran on leaded for long enough it will probably run fine on unleaded for years, UNLESS new valves have been ground in.
My Spitfire 1500 has run for about 7 years on unleaded without additive and without any signs of valve recession.

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 Post subject: Re: leaded fuel
PostPosted: Sat Jun 23, 2018 10:21 pm 
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Location: Shetland / here & there
TL;DR: I would use up the 4*, petrol is too expensive to waste!

Cheap supermarket petrol from the 90's could evaporate in the carbs and leave a sticky deposit, however, if you had a full tank of 4* BP from 1998 in your tank for the past 20 years then the likelihood is that it's perfectly fine. Petrol in a sealed container or with a small volume breather will last indefinitely. Does it lose its power? Well I guess if ethanol was present it would evaporate far faster than petroleum would and so reduce the RON ever so slightly, doubt it would be noticeable. The jelly thing, you're entire tank wouldn't turn into jelly but some may form, caused by ethanol separation from the petroleum and because ethanol is hygroscopic it draws in water from the air and you end up with a squishy jelly like gunk either floating about in the tank or left behind in a carb bowl.


Edit: Couldn't leave it there with my pseudoscience opinion, went and looked it up. First document I hit was from BP who says petrol will only last about 3 weeks without fresh needing to be added, I don't actually fill my tank up that often, lummy...

https://www.bp.com/content/dam/bp-count ... -tanks.pdf
https://www.bp.com/content/dam/bp-count ... ndling.pdf

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Current fleet: '75 Sprint, '73 1850, Daihatsu Fourtrak, Honda CG125, Yamaha Fazer 600, Shetland 570 (yes it's a boat!)

Past fleet: Triumph 2000, Lancia Beta Coupe, BL Mini Clubman, Austin Metro, Vauxhall Cavalier MK1 & MK2, Renault 18 D, Rover 216 GSI, Honda Accord (most expensive car purchase, hated, made out of magnetic metal as only car I've ever been crashed into...4 times), BMW 318, Golf GTi MK3 16v x 3


Last edited by Galileo on Sat Jun 23, 2018 10:47 pm, edited 3 times in total.

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 Post subject: Re: leaded fuel
PostPosted: Sat Jun 23, 2018 10:41 pm 
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Joined: Wed May 17, 2017 6:28 pm
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Location: NANTWICH.
If the fuel has gone off? it will smell like white spirit or turps :D

Tony.

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 Post subject: Re: leaded fuel
PostPosted: Sat Jun 23, 2018 10:49 pm 
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Quote:
If the fuel has gone off? it will smell like white spirit or turps :D

Tony.
That makes sense, if the volatiles (eg butane) are the first to evaporate then I guess you end up with something more like paraffin than petrol!

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Current fleet: '75 Sprint, '73 1850, Daihatsu Fourtrak, Honda CG125, Yamaha Fazer 600, Shetland 570 (yes it's a boat!)

Past fleet: Triumph 2000, Lancia Beta Coupe, BL Mini Clubman, Austin Metro, Vauxhall Cavalier MK1 & MK2, Renault 18 D, Rover 216 GSI, Honda Accord (most expensive car purchase, hated, made out of magnetic metal as only car I've ever been crashed into...4 times), BMW 318, Golf GTi MK3 16v x 3


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 Post subject: Re: leaded fuel
PostPosted: Sat Jun 23, 2018 11:41 pm 
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Yep, give it the sniff test. How will you know it's off? You will, trust me!
Now a controversial bit - take a teaspoon of the old fuel, put it in a large outdoor space, make absolutely sure you don't have any spillage on or near you, and throw a match on it. If it goes up, it's good. If it does nothing, it's goosed. :shock:


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 Post subject: Re: leaded fuel
PostPosted: Sun Jun 24, 2018 12:25 am 
thanks guys if it has gone off would it effect the running - a couple of people ive had round to look at it recon its running on 3 cylinders -
could that be to do with the 'old'fuel


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 Post subject: Re: leaded fuel
PostPosted: Sun Jun 24, 2018 1:28 am 
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Joined: Sun Aug 21, 2011 5:12 pm
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Location: Highley, Shropshire
Quote:
thanks guys if it has gone off would it effect the running - a couple of people ive had round to look at it recon its running on 3 cylinders -
could that be to do with the 'old'fuel
If it IS only on 3 pots, the problem is almost certainly not a fuel issue, but electrical or compression related.

Steve

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 Post subject: Re: leaded fuel
PostPosted: Sun Jun 24, 2018 3:37 pm 
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Location: Dorset
I'd just keep topping it off with new stuff, if it's burning then you might as well use it..


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 Post subject: Re: leaded fuel
PostPosted: Sun Jun 24, 2018 6:16 pm 
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Location: Ayrshire, Scotland
My 1850 had half a tank of fuel in it from 1992 when it went off the road. I took the gauge sender out of the top of the tank and had a look inside with a flashlight. All looked well with no obvious crud or corrosion, and it smelt strongly of petrol. So I went ahead and started it without any bother on this old 4-star fuel. I have heard of taking a few millilitres of the fuel and dropping it on a warm paving slab. If its any good it will evaporate quickly with no residue.

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(1969 MGB GTV8, 1977 Dolomite 1850HL, 1971 MGB roadster now all three on the road)


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