Mariner external tank conversion

[lustyd]

Hi all, does anyone know if it's possible to add the external fuel connector to a Mariner 4hp Sailmate 2 stroke? the hole is there for the part, and I believe the almost identical 5hp came with it as standard.
I have the part numbers from the manual but nobody seems to know if it's possible (I've asked in 4 outboard "specialist" shops). The parts will be around £50 so I'd rather know in advance if it will work/be easy/be possible.
Thanks all
Dave

 

[VicS]

I think it should be perfectly possible.

The diagram HERE Shows the parts for a 4 hp although you dont quote your serial number so cannot be certain yours is the same

You have a choice, shown in the diagram, of retaining the integral tank and old shut off valve or disconnecting it and opting for a remote tank only, in which case you dont need the valve.

Just be sure that your carb does have a fuel pump. Some small outboards with integral tanks only dont have. Youll need it to pull fuel up from a remote tank! Without knowledge of your precise model I cannot check but all those I have looked at do have a pump as part of the carb assembly.

 

[Lakesailor]

You are looking for the bits on the outside of the float chamber marked 16/29 in this diagram if you have them you have a fuel pump.

Diagram of the bits here

 

[lustyd]

Thanks guys, hadn't realised there was a fuel pump in there (I'm pretty new at this). That is the right diagram which I've been looking at and trying to work out which bits I require and whether it would work. I'll check for a pump next weekend and if it's there I'll try the conversion and write it up for the forum.
Thanks again
Dave

 

[VicS]

I'll check for a pump

I am pretty sure there will be. I checked several ranges of serial numbers. There did not seem to be any variation in the carbs apart from a different jet for 5 hp models

 

[lustyd]

That poses the question then, is the jet the only difference and therefore could I in theory "upgrade" to 5hp?

 

[VicS]

That poses the question then, is the jet the only difference and therefore could I in theory "upgrade" to 5hp?

I knew that would be the next question !

Its only the idle jet so the answer must be no.

I do not know the differences.
It might be a simple as removing a stop to allow the throttle to open fully or removing a restrictor plate behind the carb

It might be much more. Such as a different crank case with different porting.

 

[lustyd]

In that case I think I'll leave it alone, I don't really need the extra HP anyway

 

[Lakesailor]

On my 4hp 4 stroke Mariner it seems to be a new carb that's required. At £200 I can more than manage with 4hp.