Suzuki 4 stroke - what fuel do you use - poll

[Outsider1]

sorry mate all bp premium have ethanol

Source please?

Cheer

Dave

[Reel Nauti]

If the fuel can go off as quickly as the guy states, then are we doing ourselves a disservice by keeping tanks full between use to keep moisture intake at a minimum?

I realise the man is very qualified, but I find his claims very hard to believe. Eg: farm bulk fuel tanks can sit for months and months between top ups. (yes petrol). And car yards, particularly used cars, can sit for months and months as well.

Until recently, I hadn't been able to get out in the boat as often as I would have liked, and the fuel in one tank (which was full) was a year old. The motor never missed a beat with it.

Maybe I was just lucky

Dave

[black runner]

One of the interesting comments in the article was that as fuel ages and the lighter components evaporate, the density of the fuel increases creating a rich mixture state in the combustion chamber (more carbon deposits). The octane rating also goes up - ie volatility decreases - contrary to the popular belief that it goes down. This makes sense as the higher the octane rating the greater the ability of the fuel to "burn" rather than instantly detonate. Thats why the old low compression engines used "standard" fuel and higher compression engines used "super". Thats why the BP chemist said never to use anything other than standard ULP for outboards as clearly lengthy storage periods are an issue.

Thats not to say you can go and buy a tank of 91 and wait for a couple of months until it turns into 95. It may well do that but also the density will have increased as a result of the evaporation of the lighter components and created a richer mix. BP did say that good fuel stabilizers do work.

Cheers