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post #31 of 57 Old 07-10-2013
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Re: Tohatsu troubles

An easy we to determine that would be to track the time (engine hrs) you run the engine and divide that by how much fuel you put back into the tank, do this a few times to get an average and then you should be able to gauge your range.

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post #32 of 57 Old 07-10-2013
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Re: Tohatsu troubles

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Originally Posted by polaris2.11 View Post
rhr1956 -

We usually run our 8hp Tohatsu with the throttle just cracked open and it quietly pushes our 24' boat along at around 3.5 kt in smooth water. In rougher conditions, we might open it up a bit more. Only when pushing into pretty heavy wind (30+ kt) and sea do we have to open it to maybe half throttle. Do you have any idea what the fuel consumption might be under low throttle conditions?

I've been figuring maybe 1/2 gallon per hour, but haven't been able to find any good information. It would be good to know to get an idea of our motoring range.
Not really...I found the info on one of the Tohatsu websites. It showed the 9.8 4 stroke burning 1 gal per hour @5500 rpm. The 6hp 4 stroke burned 0.5 gal per hour at similar rpm. My motor is the 6hp and I have yet to burn a full tank in an entire summer-and we go a couple times a week. Bottom line is...they don't burn much gas.
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post #33 of 57 Old 07-10-2013
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Re: Tohatsu troubles

One more point (been resisting do to not wanting to jinx myself) is that I don't follow any recommendations that I probably should. I don't use a stabilizer, I don't shut off the fuel valve and run it till it dies, I don't run ethanol free gas...hell I don't even winterize it. One thing I do though is run the boat year round, which I think solves a lot of problems. At least a couple times a month throughout winter. If I lived in the cold country I would definately be more pro-active with preventive maintenance. Anyhow...it starts on first pull every time. I love my Nissan / Tohatsu outboard. Geez...I hope I didn't jinx myself.
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post #34 of 57 Old 07-10-2013
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Re: Tohatsu troubles

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One more point (been resisting do to not wanting to jinx myself) is that I don't follow any recommendations that I probably should. I don't use a stabilizer, I don't shut off the fuel valve and run it till it dies, I don't run ethanol free gas...hell I don't even winterize it. One thing I do though is run the boat year round, which I think solves a lot of problems. At least a couple times a month throughout winter. If I lived in the cold country I would definitely be more pro-active with preventive maintenance. Anyhow...it starts on first pull every time. I love my Nissan / Tohatsu outboard. Geez...I hope I didn't jinx myself.
Agree, if you use the motor on a regular basis and get good quality fuel and check your filters regularly, you probably won't have any problems. I never used to drain the carb on a number of motorcycles, but I rode all year although not too much in the summer.

As mentioned, the only problem I had was to forget draining the carb on my Honda 2 HP outboard which sat all winter, that one got me. I do use Berryman's fuel additive, which absorbs water, which I understand ethanol fuel absorbs from the air? Not sure if the additive is necessary, but I don't think it hurts anything?

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post #35 of 57 Old 07-10-2013
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Re: Tohatsu troubles

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I can only speak from my own experience of having plastic tanks on many motorcycles and outboards for over 40 years. the only fuel related problems I have had were related to forgetting to drain the carb for long periods of time.

There are probably many different types of plastic tanks so it may be a possibility? If they deteriorate you could probably see the debris in the tank or they may start to leak?, which would be very bad, especially with a permanently mounted tank.

Paul T
I heard that it was more at the microscopic level.

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post #36 of 57 Old 07-11-2013
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Re: Tohatsu troubles

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I heard that it was more at the microscopic level.

Regards,
Brad
Sounds frightening. My Honda pilot SUV has a plastic tank, hope it doesn't blow up my house. Interesting, I will do a search on it later.

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post #37 of 57 Old 07-11-2013
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Re: Tohatsu troubles

I have a Tohatsu 6HP 4 stroke with an external tank. When disconnecting the fuel line at the tank I get sprayed with fuel which then runs into the bottom of the boat. "open the vent" you say. I did. It appears the vent only vents incoming air to the tank. After the tank sits in the hot sun with the vent open I get a large whoosh when loosening the filler cap. I don't know if there is a pressure limit before it vents "out" or if the tank would eventually burst?. I am going to see if I can retrofit the cap so it will vent in both directions.

End result is that like the portable gas cans sold in California, I spill more gas than I ever did before.

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post #38 of 57 Old 07-11-2013
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Re: Tohatsu troubles

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Sounds frightening. My Honda pilot SUV has a plastic tank, hope it doesn't blow up my house. Interesting, I will do a search on it later.

Paul T
Do plastic tanks deteriorate?

Ethanol in Gasoline

http://www.goldeagle.com/UserFiles/f...the%20Ugly.pdf

Could be, with ethanol being most of the problem?

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post #39 of 57 Old 07-11-2013
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Re: Tohatsu troubles

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Originally Posted by dabnis View Post
I have a Tohatsu 6HP 4 stroke with an external tank. When disconnecting the fuel line at the tank I get sprayed with fuel which then runs into the bottom of the boat. "open the vent" you say. I did. It appears the vent only vents incoming air to the tank. After the tank sits in the hot sun with the vent open I get a large whoosh when loosening the filler cap. I don't know if there is a pressure limit before it vents "out" or if the tank would eventually burst?. I am going to see if I can retrofit the cap so it will vent in both directions.

End result is that like the portable gas cans sold in California, I spill more gas than I ever did before.

Paul T
I have the same exact setup.

Wow, thanks Paul T, it never occurred to me that the valve was one way. My dink and motor have been sitting in the sun all week. I just sent my wife down to the boat to check the gas tank, damn. I should have thought about that.
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Re: Tohatsu troubles

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I have the same exact setup.

Wow, thanks Paul T, it never occurred to me that the valve was one way. My dink and motor have been sitting in the sun all week. I just sent my wife down to the boat to check the gas tank, damn. I should have thought about that.
If you are tired of having gas squirt all over your hands when disconnecting the hose it can easily be fixed. Right in the middle of the cap there is a small rubber "duckbill" valve which allows air in but not out. By removing, just pull it out with a pair of long nose pliers, the tank will then vent in both directions

Not wanting to go to EPA jail, I am not recommending anyone actually do this, but it worked for me.

Paul T
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