AV - Gas?

**89LASER** · 11-13-2017, 06:53 PM

I winterize with it from a small tank and leave the tanks in the boat empty so the ethanol doesn't attract water over the winter.

**FMP** · 11-13-2017, 07:00 PM

Dry tanks, can't leave the 10% sitting around. Carbs and pumps and lines empty. Good idea with the 100 LL if you run it through and fog behind.

**jpf091959** · 11-13-2017, 07:18 PM

I run 100LL, either straight up or mixed 50/50 with premium pump gas. The AV gas is oxygenated (I could be wrong) or engineered to run at higher altitudes, so I always run Lucas Fuel Injector cleaner/lubricant.

If I remember correctly AV fuel used to be the base component used in race fuel, the manufacturer would then add hydrocarbons like TEL.

**71V153** · 11-13-2017, 07:38 PM

You boys need to move South ...

And fwiw less'n yer motor really needs it, octane ain't all it's cracked up to be. I've gotten by with 87 in a pinch ...

**Laser LTV** · 11-13-2017, 10:37 PM

I buy my 112 from local Sunoco station that has 100 also

**Coryc** · 11-14-2017, 03:14 PM

Originally Posted by FMP

Is straight 91 or better difficult to find in that area?

No, not really. A lot of gas stations and shops carry Sunoco race fuels and up in northern NY 91 non ethanol is at every Stewart's shop.

**2.5-21** · 11-14-2017, 03:28 PM

Originally Posted by Coryc

No, not really. A lot of gas stations and shops carry Sunoco race fuels and up in northern NY 91 non ethanol is at every Stewart's shop.

The Liberals here in this part of new york dont feel we need non ethanol fuel.....

**FMP** · 11-14-2017, 04:31 PM

What motor are you fueling? Sunoco 94 is about the best pump here. Goes by the brand PetroCan, and is 10% alc. Works great with good oil.

**Coryc** · 11-14-2017, 08:42 PM

Originally Posted by 2.5-21

The Liberals here in this part of new york dont feel we need non ethanol fuel.....

yeah I hear ya. I live in NY just over the border from danbury CT and I gotta drive an hour to get the 91 non ethanol. Fortunately my whole family lives in lake George so I'm up there with my boat quite a bit and fill it up with the non ethanol.

**gearcase** · 11-15-2017, 01:31 AM

Ran a lot of 100LL threw my 2.5 merc s 3000 185lb. fuel matters.

**Hupiveneilijä** · 11-15-2017, 02:36 AM

Originally Posted by FMP

Just saying, don't have to follow. On crossflows I have that are fresh rebuilds with all things right and blow-by that's minimal and cranking psi done correctly at 170psi. I run min 91 to 94, never an issue with even lots of ign. I run forged pistons and lots of good oil. Same motors still with 170 psi and 200hrs, no issues pistons look beautiful. Doesn't mean it works for you .

I run mine omc70 with ~175psi & 21* max timing on our 98e5 here in Finland. Piston tops & plugs look just fine and 4% fullsynt oil.

**FMP** · 11-15-2017, 07:38 AM

I think it's the limit. But just read on another thread about 190-200psi tohatso 25/30hp stock psi. Not taking consideration of running psi but that's tight for pump gas. Two stroke rotax as well I think are over 200?