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Old 03 October 2016, 18:44   #31
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Originally Posted by mikew4 View Post
Correct. However once the fuel leaves the refinery, additives are put in, which differentiates it according to brand.

Personallly, i fill up from anywhere and dont notice a blind bit of difference
I haven't managed to correlate the brand to quality but I do believe that premium diesel gives me better running in the car, and have not had any EGR issues since switching to it for every full tank (Mrs P "tops up" with random stuff in between).

As a result I prefer to run the O/board on premium fuel too. Mrs P also works at a Scottish oil refinery and whilst the raw fuel is the same believes there are additive blends that depend on the destination, and "marketing".
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Old 03 October 2016, 18:52   #32
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I haven't managed to correlate the brand to quality but I do believe that premium diesel gives me better running in the car, and have not had any EGR issues since switching to it for every full tank (Mrs P "tops up" with random stuff in between).

As a result I prefer to run the O/board on premium fuel too. Mrs P also works at a Scottish oil refinery and whilst the raw fuel is the same believes there are additive blends that depend on the destination, and "marketing".

I would agree with that run both my motors and the boat on BP or Shell top spec for the few pence more it costs and if you ask any mechanic what causes most injector related issue it's down to supermarket stuff
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Old 08 October 2016, 18:45   #33
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I turn off the fuel and run small engines dry at the end of the season, having had problems with them in the past with gunk in the carbs when I have left the fuel switched on. I do it with strimmer, mowers and the garden rotavator. Have never thought of doing it with the outboard but I might from now on.
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Old 09 October 2016, 05:26   #34
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I turn off the fuel and run small engines dry at the end of the season, having had problems with them in the past with gunk in the carbs when I have left the fuel switched on. I do it with strimmer, mowers and the garden rotavator. Have never thought of doing it with the outboard but I might from now on.

Don't do it to the Etec !!


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Old 09 October 2016, 06:13   #35
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I would agree with that run both my motors and the boat on BP or Shell top spec for the few pence more it costs and if you ask any mechanic what causes most injector related issue it's down to supermarket stuff
Having worked in the fuel industry for a number of years,and knowing what actually goes into each type of fuel and where it comes from I have come to realise that most mechanics, plumbers and boiler repairers are very vocal on subjects that they know absolutely bugger all about.

For what it's worth,standard 95 RON supermarket fuel is a 'standard retail blend' wherever it comes from (and it comes from ALL the fuel terminals/refineries depending on where they can get it).

It is exactly the same as fuel supplied to a large number of independent chains of filling stations, and a higher spec than is supplied to quite a lot of filling stations.

If you really want to use better petrol, run super unleaded or the branded equivalent. It's got no ethanol in it yet in the UK.
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Old 09 October 2016, 07:08   #36
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I turn off the fuel and run small engines dry at the end of the season ... Have never thought of doing it with the outboard but I might from now on.
Why not to follow Etec manual.
Add Evin stabilizer and run winterization from tachometer gauge.
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Old 09 October 2016, 07:38   #37
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Originally Posted by Nos4r2 View Post

If you really want to use better petrol, run super unleaded or the branded equivalent. It's got no ethanol in it yet in the UK.
Are outboards able to adjust timing to suit 97-99. I've not come across a knock sensor on an outboard yet but then again I've not worked on all marques.
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Old 09 October 2016, 07:57   #38
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Higher the octane, the less knock
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Old 09 October 2016, 08:07   #39
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Originally Posted by Nos4r2 View Post
Higher the octane, the less knock
"Knock knock!"

"Who's there?"

"Gas"

"Gas who?"

"um, I dunno... "
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Old 09 October 2016, 08:25   #40
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Quote:
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Higher the octane, the less knock

But outboards can't generally adjust their timing to take advantage of the higher octane. So there's no benefit in using the posh stuff.
I contacted Shell a few years ago to enquire about the difference between the bog standard unleaded & the Vmax high octane fuel. The regular unleaded has less than 5% ethanol. The Vmax has "upto" 10% ethanol, but they didn't actually put a figure on it. Ethanol is used to raise the octane, so by buying the expensive high octane fuel, you're actually paying more for increased ethanol content. I have the data sheets somewhere, I'll dig them out.
BRP advise to use regular un-leaded in Etecs.


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