Is my Evinrude a gas hog or is there a problem?

I have a 1956 Evinrude 15hp short shaft motor and a 3 gallon pressurized, two-line tank. It seems to just guzzle fuel. I don't see any leaks from the carb and it seems to run fine though, as this is the first motor of this age I have owned, I have nothing else to go by. I have the high and low mixtures set correctly. I would speculate that I can run about 2hrs wide open (I'm guesstimating here because I took 6 20 minute trips at full throttle, before I run out of fuel. Does this sound normal? Maybe I'm not used to it because I've run 5 and 10 hp johnsons in the past...

Thanks in advance

Tim

If you figured the avg speed of a boat with a 15hp motor on plane is somewhere around 20 mph, 2 hours of running wot would be 40 miles. Divide that by the 3 gal of fuel would be 13 mpg. I'd say that's pretty good.

[url=https://www.tinboats.net/forum/viewtopic.php?p=320560#p320560 said:

JMichael » 30 minutes ago[/url]"]If you figured the avg speed of a boat with a 15hp motor on plane is somewhere around 20 mph, 2 hours of running wot would be 40 miles. Divide that by the 3 gal of fuel would be 13 mpg. I'd say that's pretty good.

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X2 and Johnson and evinrude are 1 in the same....motors that is

outboards estimated consumption of fuel is usually 10% of the ho of the motor. so at wot, a 15hp will be about 1.5 gal / per hour. so 3 gal in two hours. seems about right.
dino

I have a '57 Evinrude 18hp on an Alumacraft 14X48 MV jon boat and it runs just fine. Get a 6gal tank and forget your fears and have fun.

15 hp 2 stroke will burn about 1.5 gallons per hour so yours is about as it should be. Try owning a 200+hp 2 smoke sometime if you want to cry about fuel usage #-o

Thanks, all. Glad to know it was just sticker shock and not something actually wrong with the motor. :lol:

I have to say, I really like this old motor. It idles well and starts easily. Pretty amazing for a 57 year old motor. Now, with regard to a 6 gallon tank.., finding a pressurized two line tank might be a real challenge. Might be cheaper and easier to actually install an after market fuel pump For now, I'll just plan my excursions accordingly.

Tim

[url=https://www.tinboats.net/forum/viewtopic.php?p=320694#p320694 said:

The Wirtzer » Today, 19:19[/url]"]Thanks, all. Glad to know it was just sticker shock and not something actually wrong with the motor. :lol:

I have to say, I really like this old motor. It idles well and starts easily. Pretty amazing for a 57 year old motor. Now, with regard to a 6 gallon tank.., finding a pressurized two line tank might be a real challenge. Might be cheaper and easier to actually install an after market fuel pump For now, I'll just plan my excursions accordingly.

Tim

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Those tanks pop up on Craigslist quite often around here and also Ebay

If you want to make longer trips, just get one of those inexpensive 5 gal gas jugs like a lot of people use for their mowers and take it with you. When the 3 gal tank runs dry, just refill it from the 5 gal and you're off and running again. One of those 5 gal jugs is a whole lot cheaper than buying another pressurized outboard tank.

[url=https://www.tinboats.net/forum/viewtopic.php?p=320677#p320677 said:

tnriverluver » Yesterday, 17:03[/url]"]15 hp 2 stroke will burn about 1.5 gallons per hour so yours is about as it should be. Try owning a 200+hp 2 smoke sometime if you want to cry about fuel usage #-o

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You'd be surprised. My 225 ProXS has similar fuel consumption to my old 90 carbureted Merc @ WOT. Maybe even a tad better.
I would agree with jmichael and just get a portable gas can.

tip: Don't run on wot. You will save a buttload of gas.

[url=https://www.tinboats.net/forum/viewtopic.php?p=320862#p320862 said:

Pweisbrod » Today, 19:51[/url]"]tip: Don't run on wot. You will save a buttload of gas.

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Agreed I just got back from a week long fishing trip with my Johnson 15hp, and fished all day, every day, on 6 gal. of gas!

The 2 strokes use up fuel faster than 4 strokes. The larger the outboard the worse the fuel economy. Look at engine data on the mercury homepage to see how bad marine fuel economy is compared to cars.

[url=https://www.tinboats.net/forum/viewtopic.php?p=320862#p320862 said:

Pweisbrod » Mon Jul 01, 2013 6:51 pm[/url]"]tip: Don't run on wot. You will save a buttload of gas.

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X2