Excessive fuel consumption 1984 Evin. 150?????

[MGuckin]

I finally got my fuel guage working, bad sending unit. I filled the tank and went fishing burned 5 gallons. Cruised at 32 mph +/- @ 2800 rpm for about 1 hour total. (yeah I opened it up once for a passenger for a minute or two). Does this sound excessive? Motor seems to run fine with no fuel leaks. Motor is hung a 1976 18' Starcraft walkaround, aluminum hull with a cuddy cabin, about 750 lbs. in passengers and gear.<br />Your opinions are appreciated.<br />Thanks in advance, <br /> <br />Mike

 

[ehenry]

Re: Excessive fuel consumption 1984 Evin. 150?????

Sounds about right to me.

 

[jegervais]

Re: Excessive fuel consumption 1984 Evin. 150?????

The "Rule of Thumb" for carbureted 2-Strokes is 10% of hp @ WOT = gallons per hour (gph) burned, or in your case 10% of 150 = 15 gph. Typically the best fuel economy (for cruising) with a 2-stroke outboard is around the 3/4 throttle point, which on your Evinrude will probably be between 3000-4000 rpm's.<br /><br />-John

 

[hi_five]

Re: Excessive fuel consumption 1984 Evin. 150?????

John, does this mean I can expect to use 45gph in a 31'6" chris craft with twin 225 Johnsons? or does the fomula you provided not relate to twins?

 

[MGuckin]

Re: Excessive fuel consumption 1984 Evin. 150?????

Thanks for the formula. I guess I can't complain then but I better get a bigger fuel tank. Is 18 gallon now OEM.<br />Mike

 

[jegervais]

Re: Excessive fuel consumption 1984 Evin. 150?????

hi-five:<br /><br />Yes, 45 gph is corrrect, but that figure is for WOT. Expect better at "cruise" speed. Keep in mind it's just a general rule, some set-up's do worse and some do better.<br /><br />Don't forget the 1/3 rule for cruising: allow 1/3 tank capacity for getting there, 1/3 for getting back and 1/3 for back-up/emergency.<br /><br />-John