Water fuel seperator question.

[biglurr54]

I finally added a water fuel seperator to my 1989 evinrude 120 looper. The kit I purchased is a Sierra kit that came with a filter. The filter is for a mercury I/O. its the only one they had in stock and the sale was ending. i plan on purchasing the proper filter but I'm not sure what that is. Also will the Mercury I/O filter work? I figured I could save it as a back up instead of buying two of the proper ones for the motor to save some cash. If it wont work then I will just throw it away and buy two of the proper ones for the motor but If it would work as a spair then I will keep it. What do you guys think?

 

[wilde1j]

Re: Water fuel seperator question.

There's nothing unique about an I/O or outboard filter. As long as you use a 10 micron filter element, it will keep water and trash out. The filter needs to have a flow rate/pressure drop consistent with your motor's needs. i.e. min of say, 20 gph with no more than ~ 2 psi pressure drop. Your motor won't use more than ~ 12 gph.

 

[biglurr54]

Re: Water fuel seperator question.

my only concern was that the merc crusiers have fuel pumps pushing fuel through the filter and my engine has carbs pulling the fuel. i wasnt sure if they use different elements or flow patterns to help assist the flow so the carbs dont have to suck as hard.

 

[biglurr54]

Re: Water fuel seperator question.

Does anyone else have any input on this?

 

[wilde1j]

Re: Water fuel seperator question.

Your engine has a fuel pump, just not a mechanical one. Without a fuel pump, your motor could never run. The filter doesn't care whether the pump is before or after the filter. The only need is that the filter pressure drop and flow capacity is adequate for your motor. Look at the filter specs ... the capacity should be ~ 2x your motor's max demand (12 gph) and with a delta pressure around 2 psig or less. That's it.