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Hm Seat/tank Extender 4Rt

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I have one of these for my 4RT, but not tried it yet. However, the introduction of the new 4Ride is making me think again about it. One thing I've not been able to determine is how fuel gets from the additional tank to the main one. 

 

I have read that one has to pour the fuel from the HM into the main tank, which IMO is a PIA and I really want to be able to use it all in one go, without having to faff around like that half way through.

 

But I've also seen it stated that as the fuel is used from the main tank, the low pressure can draw fuel from the HM and so empty that first which seems it should be easy to arrange and solves the problem.

 

So which is it? Anyone who uses the HM enlighten me on this?

Talked to someone with one abort it and the default is remove and pore, however we both believe if you wanted to do the siphon method it would be achievable only with a custom cap set up with a siphon hose and air vent to work. 

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