Fuel for four strokes

[Moonlighter]

I am told by industry sources that Premium ULP "goes off" faster than normal ULP.

My local Yammy deaer recommends AGAINST using it, mainly for this reason. Plus, there are no performance benefits for motors designed and programmed to run on normal ULP.

A big change in habit that most people have now adopted is to leave the fuel tank empty after a trip and to fill up with fresh ULP on the way to the ramp next trip. Avoids the stale fuel issue.

But can increase the potential for condensation in the tank, therefore even greater need for water separating fuel filters and regular checking thereof.

Just my thoughts

ML

[goanna1]

I am told by industry sources that Premium ULP "goes off" faster than normal ULP.

My local Yammy deaer recommends AGAINST using it, mainly for this reason. Plus, there are no performance benefits for motors designed and programmed to run on normal ULP.

A big change in habit that most people have now adopted is to leave the fuel tank empty after a trip and to fill up with fresh ULP on the way to the ramp next trip. Avoids the stale fuel issue.

But can increase the potential for condensation in the tank, therefore even greater need for water separating fuel filters and regular checking thereof.

Just my thoughts

ML

A yamy dealer in bundy told a mate of mine that using premium fuel was the way to go because the extra octanes made up for the additional cost because the fuel effiecency . I have also heard that if you have old fuel in your tankl (ulp) you should top it up with premium because part of the the trouble with old fuel was a reduction in octanes?? As a consequence I told my brother this he has run his yamy on premium ever since his 4 stroke has really great fuel consumption go figure

[goanna1]

p.s. if you don"t keep any fuel tank full it will produce condensation regardless of what fuel you have in it . also A fuel company told me that all ulp regardless of brand or breed or octane is only good for 6 months

goanna

[dogsbody]

On Ifish today they said that Premium goes off quicker than std ULP. They also were peddling some additive that alleges to keep your fuel good for 12 months.

Dave

[finlayson]

This is my fuel rule of thumb that i stick to.
It does not matter what servo you use there is always the chance of bad fuel ie. water in the fuel, expecialy arround holiday season. In one case i have experienced a boat came into the shop which had 100+ltrs of water in the tank that he had just filled at a big well know bp servo "in holiday season", the servo denied any accountability. I have found that fueling in the morning is best because the tanks have been topped up and the fuel is most of the time fresher.

As for E10....which i personally do not use as a mechanic.....is technically fine to use in newer engines 07 > (not in older engines due to rubbers and plastics being affected buy the ethanol) regardless of what type of ecm and sensors its running ie knock sensors, newer 4 strokes are also running closed loop efi fuel systems which means they run and o2 sensor to tell the ecm how much fuel is not being burnt to further improve fuel efficiency and performance.
In regards to noticeable performance gains in higher octane fuels being used...There will be no difference in your every day boat...but if it gives you piece of mind then why not. You will get better fuel efficiency with a high octane fuel because it burns slower whilst delivering the same explosive power within your engine....but it is hard to notice this because you will never get two days alike in the water ie chop, wind gust and direction ( boats are not very airo dynamic) , currents, water surface etc.

As for leaving fuel in your tank if its been longer than 3 months since a top up or refill drain it...better safe than sorry because it will either drop in octane rating which means bad fuel of it will develop water which means bad fuel and it my take some of your time and cost you a little more in extra fuel but its cheaper that and repair bill at the workshop or the hassle of a break down. Sure you can add new fuel and it will mix but you would only do this if there was a small amount in the tank so really it would just be as easy to drain out and re use it in the mower, whipper snippier etc...
For the guys that pre mix don't much around if its 3+ months put it aside and use is for the garden tools.

Summing up if you have and new engine use what ever you want (there designed to run it under all operation conditions), older engines use premium ulp just don't let excess fuel sit in your tank for long period of time. If you are using you boat regularly this would mean that you are fueling regularly ( whether its a top up or a full tank the fuel is fresh)
Keep the fuel fresh and you will never have and issue but remember there is always the chance of getting bad fuel at the servo, unless you squirt some fuel in a beaker before you put it in your boat and examine it for water and give it a wiff to see how it smells . this may look strange to the pension on the bowser next to you though
You just have to really trust the fuel station you use which is had when your on holidays but hay gives you another question to ask the local tackle shop owner.

As for your ws filters always check them each time you use your boat..takes 5 secs if there in the correct place on the transom where they are easily visible which i know in alot of cases they are not lol i have had to pull the rear seats of of many boats and push aside thick jungles of cabling to get to some filters

I hope this advice helps some of you...i know every one has there own opinion and i have herd all of them over the years and there all right in one way or another as long as the fuel you have is fresh and you have peace of mind then its all good.

[Fatenhappy]

Never found any difference at all when running ULP or Premium in 4 STX...

I've always just stuck with clean fuel, oil and air and you can't go far wrong ...

[shakey78]

Well I have a good one for you, I drive to adelaide alot from canberra I have a 08 Subaru Forrester 2.5 turbo and normaly get 500km city and 850km on highway (manual) I tested my car with E10 and on the highway I got 380km then I switched back next tank with premium 98 and got 840km so you tell me where the savings are as for using around town E10 270km??? no real saving there!!!

I did try normal unleaded and my car did not like it it felt like a train was hitting me up the ass big power loss, but in the boat wow same as the car!! PLEASE BE CAREFUL AS YOUR FUEL USAGE IS HUGE WITH E10 WATCH YOUR FUEL GAUGE VERY DANGEROUS!!! you can watch the needle drop, where as Premium or Standard ULP was fine just noticed the Premium ran a little smoother under load on a yamaha 150hp 09 model on a custom 6.5 aluminium total weight 1800kg

[White Pointer]

G'day,

I run 98 octane BP or Caltex.

I do it because:

1. I refuel at the end of a trip to reduce tank condensation

2. I know the RON won't degrade so much between trips to make the fuel substandard

3. Higher refined fuels are cleaner, so I expect to maintain performance and reduce service and maintenance costs.

Regards,

White Pointer

[Ericsson]

It's easy as what is the recommended octane level for that engine say Ron 90 if so regular will be ok if you use a 95 or higher you are waisting your money cause the engine will only burn what octane level which is needed by the engine management system that's if it's fuel injected