Outboard - internal to external tank?

[Viking]

Mariner 4 outboard is it hard to convert from the existing internal petol-tank to a new external tank and whats needed???
Thanks!

 

[VicS]

A fuel pump is the most crucial part. If there is a version of your engine that takes a remote tank then it it likely that you will be able to get a pump to fit. It will need a connection to the crankcase to provide the pressue pulses to drive it though. Ok if the connection point is there and just plugged but not impossble to drill and tap a hole but you really would have to know exactly what you were doing.

Connectors for the fuel line would be no problem as they would be availble for similr models (or any old model for that matter)

Tank and priming bulb readily available.

 

[Lakesailor]

Is it based on the Yamaha 4?
My Yamaha 4 (4 stroke) has both options with an integral tank, an external connector and a two position fuel tap. Perhaps you could use the Yamaha parts bin.

 

[smeaks]

I converted an old mariner 4hp 2s to an external drive. Firstly I had concerns over the pump but decided to have a go... it was fine.
1) Remove the front plate that has the fuel valve rod mounted.
2) Purchase the actual fuel conection from chandler. This locates directly into the same place as the removed valve actuator.
3) Cut the fuel line after the fuel valve from the internal tank and use a T piece to attach a fuel line straight from the new external connector.
4) Attach the external tank via the correct adaptor (purchased with the fuel tank, line and priming bulb).
5) Prime well and should start ok.

However this was all on my old mariner 2 stroke (rebadged Yamaha) I also did the same to a genuine yam with no problem.

good luck.

 

[simonfraser]

if you can get the external tank higher than the engine you won't need an external pump ?

 

[Lakesailor]

As we haven't had a reply from Viking yet it's all supposition. There may be a fuel pump.

 

[Viking]

It a 5 year old 2 stoke but with only 3-4 hrs use (yacht tender use) with the amount of use it gets is it worth changing? Its a bit heavy moving with a full tank.
But I like tinkering with things.
The local dealer said it would cost £60 to convert but I can get the bits of about £20 including a tank.
Thanks for the info thats its a rebadged Yamaha I throught it was a look-a-like Mercury.
Thanks again all

 

[FL390]

For a number of good reasons am thinking of doing this with a 2 stroke Suzuki 2.2.

The internal tank has the fuel feed situated at the base most of which sits higher than the carb it feeds. My plan is to use a 500ml aluminium camping fuel/water bottle. (Perhaps even using a bike bottle cage to secure it to the engine case.) The engine is mostly but not exclusively for emergency use. I want to be able to store in in the cabin without gas in the tank.

Would this engine be totally dependant on gravity fuel feeding or is there some ‘suck’ even without a pump? And if so would it cope with a 15-20cm rise? I have a plan B if not, it’s just not a elegant, prone to leaks, and twice the price.

 

[VicS]

The fuel system in the 2.2T is purely gravity fed .

 

[GunfleetSand]

The tank would need to be vented

 

[Spirit (of Glenans)]

It a 5 year old 2 stoke but with only 3-4 hrs use (yacht tender use) with the amount of use it gets is it worth changing? Its a bit heavy moving with a full tank.
But I like tinkering with things.
The local dealer said it would cost £60 to convert but I can get the bits of about £20 including a tank.
Thanks for the info thats its a rebadged Yamaha I throught it was a look-a-like Mercury.
Thanks again all

For that price, with backup if it gives problems, why would you do it yourself?