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Old 14 May 2019, 06:35   #1
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Tohatsu 6hp starting issue

I've recently acquired a new Tohatsu 6hp long shaft OB to use as an auxiliary but am having a few issues. I just can't get the thing to start off of the internal tank. It will start off of the external connection and can then switch over to the internal and it will keep running. similarly if I start on the remote tank and switch off, it will re-start on the internal, for a good while afterwards. I keep the remote tank out of the way in a console so would like to be able to start on the internal in case of a poo/air mover incident then sort the remote as needed but am lost as to the cause.

To clarify my starting procedure:-
  1. Move fuel tank selector from store/external to internal.
  2. Slightly pull out choke.
  3. Keep pulling cord until face is blue and frustration takes over.

If I connect the remote and prime it, it starts first pull and runs well, for what little time it has been used.

Before I go back to the dealer, is there anything I can do to fix the issue or check for problems. To rule out the most likely cause (operator error), am I missing anything? I can't find a primer on board the engine but it feels like fuel is not getting from the tank to the carb.

Thanks All

Phil M
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Old 14 May 2019, 12:31   #2
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Tohatsu 6hp starting issue

Have you turned/opened the breather on top of the internal tank cap? If not, that would cause a vacuum and prevent fuel flow.
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Old 14 May 2019, 12:34   #3
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Is the breather cap on the internal tank open or blocked not allowing fuel to flow by gravity
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Old 14 May 2019, 15:46   #4
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Is there a fuel cut off valve if you trace fuel line from internal tank? Go with Jeff's suggestion regards breather valve or screw on top off internal fuel tank.
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Old 15 May 2019, 05:52   #5
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his didnt start immediately

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Old 15 May 2019, 06:10   #6
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Hi

I've got a 6hp Mercury (same engine) with about 3 hours on it and it's exactly the same.

Before you open the vent, get a hold of the tiller and give the engine a good shake from side to side.....that normally does the trick. (works on a lot of small OBs)
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Old 15 May 2019, 06:33   #7
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Quote:
Originally Posted by Last Tango View Post
Hi

I've got a 6hp Mercury (same engine) with about 3 hours on it and it's exactly the same.

Before you open the vent, get a hold of the tiller and give the engine a good shake from side to side.....that normally does the trick. (works on a lot of small OBs)
so using the gas pressure to force fuel in fuel line must air lock
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Old 15 May 2019, 10:13   #8
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Thanks for the tips. If I can find time I'll give it a go this evening and start with a shake and make sure the cap vent is open.

Fingers crossed
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