Tohatsu 5 hp 2 stroke outboard fuel problem - SailNet Community
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post #1 of 12 Old 06-12-2016 Thread Starter
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Tohatsu 5 hp 2 stroke outboard fuel problem

Hello,
I am pretty new to outboards. I was aiming to start the outboard after a long time standing. I put fresh fuel and oil (1:50) in the external tank primed it with a few squeezes with the primer ball and it fired up quite easily and ran well. After 5 Mins the engine stalled and it seemed that the clear indicator on the fuel line was empty. I then tried to start it again and couldn't get it going. From my understanding most outboards have a fuel switch which enables you to turn off and on the supply, on this one I cannot find such a switch and there seems no way of turning the flow off or on. Would the fuel tank be gravity fed? As when I was running it the fuel tank was on the floor and the outboard on a stand above it.
Any help would be very much appreciated!
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Re: Tohatsu 5 hp 2 stroke outboard fuel problem

Are you using Ethanol gas from the pump? You should not be. I don't know if you have ethanol gas in the UK.
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Re: Tohatsu 5 hp 2 stroke outboard fuel problem

Do you have the owners manual?
http://www.tohatsu.com/tech_info/own.../Toh5B_5BS.pdf
Some Tohatsu 5 hp 2 cycle have in internal tank, other have an external tank.
The service manual is also on line.
http://www.tecnomar.cl/pdf/pdf_servi...202-Stroke.pdf

I have the 8 hp with Nissan decals. It is a great little motor.
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post #4 of 12 Old 06-12-2016 Thread Starter
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Thanks for your help, it looks like there are two systems one with a pump and one gravity. I am just using gasolineand oil mix? It seems like the fuel clock is on the tank not on the motor, which makes sense why I can't find it on the motor. Any more information would be very helpful
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post #5 of 12 Old 06-13-2016
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It does sound like a fuel starvation issue. Your engine ran fine until you ran out of fuel in the carburetor. Did you squeeze the bulb on the hose from the tank enough? Try putting the tank on a table so it is more at the motor's level. Perhaps the fitting where the hose attaches to the engine is clogged? Can you remove a hose from the carb and pump the bulb to check for fuel?

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post #6 of 12 Old 06-13-2016
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Re: Tohatsu 5 hp 2 stroke outboard fuel problem

Could the carb float be stuck in the up position?

I would start at the fuel tank and work towards the carb, just because it's easier. You should have nice easy fuel flow by squeezing the bulb up to the carb.

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Re: Tohatsu 5 hp 2 stroke outboard fuel problem

With a problem like that, the first thing I always do is to carefully inspect the fuel line, squeeze bulb and all the fittings. Check for even the slightest leaks, and check the hose and the squeeze bulb for cracks. If there's the tiniest crack, it can let air into the line. The squeeze bulb is there to pressurize the fuel line. If air can get in through a crack or a loose fitting, it will de-pressurize the fuel line and the engine will be fuel-starved. Cracks are most likely to be found where the hose is connected to a fitting. I have occasionally made an emergency repair that is adequate to get back to the marina by cutting an inch off the cracked end of the hose.
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Re: Tohatsu 5 hp 2 stroke outboard fuel problem

You might also have some junk in the fuel filter or carburetor. It is a common problem after the motor sat for a long time.

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Re: Tohatsu 5 hp 2 stroke outboard fuel problem

Thanks a lot for your replies. Is it fairly common to have a gravity fed system? I can't seem to see a fuel pump! I have removed a hose from the car and squeezed the bulb and fuel was flowing, so there isn't a blockage there! There is an air bubble in the fuel filter though!
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post #10 of 12 Old 06-14-2016
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Re: Tohatsu 5 hp 2 stroke outboard fuel problem

Quote:
Originally Posted by sgjfrods View Post
I can't seem to see a fuel pump! .... There is an air bubble in the fuel filter though!
Spend some time with the service manual to figure out how the engine works. The fuel system is in section 3. The carb mounted fuel pump is shown in a photo. There is a long troubleshooting table.

The fuel pump is also shown as part 3-1-19 in the parts manual.
https://www.tohatsuoutboardparts.com...2N21005-6).pdf

If you have a fuel problem, the engine should start easily after you spray some starting fluid (ethyl ether) into the carb inlet. If that does not make the engine run, you need to be looking elsewhere for the problem.

It is not at all unusual for the fuel filter to be partially filled with vapor. Gasoline (petrol) will still pass through it.

I trust that you are running the engine with the lower unit submerged in water. Running the engine dry will ruin the rubber impeller in the water pump in very short order.

Last edited by wsmurdoch; 06-14-2016 at 07:06 AM.
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