Wonder no more Fenlander
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..as I use both the internal tank and an 8 litre external tank on my small boat powered by 6HP Fourstroke Yamaha.
For most of the journey I use the external tank which is full of E10 petrol. It runs great on E10 with no issues whatsoever. However as Im aware E10 can break down if left in carbs too long ... the internal tank is kept full of Premium fuel. 5 minutes before landing I switch to run on internal rank and premium fuel flushes out the E10 fuel.
Why do I do this ? Because E10 is cheaper and also Premium fuel is harder to source up my way.
For years I used to only have 2.5HP outboards on a Seago slatfloor so had no option but to fill the internal tanks while at sea. I therefore know how hard it is holding a filler tank with one hand and its nozzle in the OB tank with the other hand. I had to get right in close to the transom .. and lean over to reach the OB ... with no hands holding the boat ..and the boat bouncing about in a chop.
As such I was delighted when I got my first 4HP Tohatsu with external tank.. I knew one day I could easily fall in when in a chop was bouncing the boat..but I never once contaminated the fuel. However I did loose a bit of fuel as I couldnt see how full it was getting until it runs out everywhere. It only polutes the sea and not the boat so back then I didnt care.
That is my experience anyhoo.. others may be different.
Happy New Year everyone.