What fuel do you use?

[951prerun]

I just picked up a boat with a 2.5 Merc 280 (bone stock motor), what fuel should I be running in it?

 

[DRIVE BYE]

i have a 300 and i run 91

 

[hallett21]

250 xs 91 octane

 

[951prerun]

Do you guys ever worry about getting bad gas out of the pump? I hear of people mixing half 91 and half 100 oct race gas or running av gas just for precaution? I just want avoid blowing it up. Any thoughts?

 

[rivermobster]

Do you guys ever worry about getting bad gas out of the pump? I hear of people mixing half 91 and half 100 oct race gas or running av gas just for precaution? I just want avoid blowing it up. Any thoughts?

The higher the octaine, the slower the burn. Raw fuel in you cyls is never a good thing. Use what merc recomends.

 

[Gelcoater]

The higher the octaine, the slower the burn. Raw fuel in you cyls is never a good thing. Use what merc recomends.

What he said:thumbsup

 

[yard dog]

91 using xd 100 synhetic oil premixed

 

[W.O.T MARINE]

Use 91 OCT minimum from a quality station and I would use Mercury Premium plus oil mixed at 50:1. Mixing 91 OCT and race gas is ok, Im unsure about using ave gas in the outboard as is its indened burn rate is a slower RPM.

 

[ROZ]

I think mercury recommends different octane for different levels of motors I spoke with mercury earlier this morning and they said I should run 87
on my 200 hp 2.5

 

[951prerun]

Mercry recommends I use 92 oct. with my 2.5.....However, I only have 91 available at the pump. That is why I thought I should try adding some race gas to my pump gas.

 

[Luv2gofast]

Mercry recommends I use 92 oct. with my 2.5.....However, I only have 91 available at the pump. That is why I thought I should try adding some race gas to my pump gas.

I use 91 from a good station with Klotz R50 @ 40:1. I use enough Klotz octane booster to get at least to 92 when I am on a lake that only has 87.

98 280 com on a Lavey 20.2

 

[Mr. C]

Interesting on the 87 octane. I have a 88 150 blk max, I have only ever used 91 and Shell gas only, Never have i had any type of fuel issue. Granted mine is older and not disagreeing with what you were told, but I don't think i've ever heard of anyone being told to use 87.

I think mercury recommends different octane for different levels of motors I spoke with mercury earlier this morning and they said I should run 87
on my 200 hp 2.5

 

[RitcheyRch]

I use 91 octane and use Evinrude 2 cycle oil.

 

[ROZ]

Interesting on the 87 octane. I have a 88 150 blk max, I have only ever used 91 and Shell gas only, Never have i had any type of fuel issue. Granted mine is older and not disagreeing with what you were told, but I don't think i've ever heard of anyone being told to use 87.

Yep. I called Mercury twice just to make sure. Both took my serial number and second tech said I had the 1992 200hp 2.5 standard motor and use 87.

 

[Wicky]

The kind with out any ethanol in it. Pure dinosaur juice is the only way to go. Don't know if you have that option in Kalifornia anymore though.

 

[Fltplan]

Do you guys ever worry about getting bad gas out of the pump? I hear of people mixing half 91 and half 100 oct race gas or running av gas just for precaution? I just want avoid blowing it up. Any thoughts?

It's inevitable, any kind a gas, it's gonna blow!

That being said, I would run 91!

If it can't run pump gas from the dock and stay in the water overnight...