Fuel pump question

[J. Mark]

1988 Mercruiser 5.7 inboard

I recently bought the fuel pump pictured below as my engine had an automotive pump on it. It has a threaded opening that is plugged rather than a fitting for a fuel return line.

Is this the location for the fitting and do I just need to add a fitting there or is this something else. The application listed was correct for my engine and was listed as a marine application part, but I am not sure if this pump will work as I intended.

I am a bit of a novice on marine fuel pumps and while I understand the differences and the reason for those differences-I don't have any practical experience with them.

 

[jerryjerry05]

Re: Fuel pump question

If it's plugged and you don't have a return line on your motor don't worry about it.Most of the time they are useless and get pinched or plugged with gunk.Most dont work anyway.J

 

[Fishermark]

Re: Fuel pump question

I will take the opposite position and suggest putting the fitting and hose on there.

 

[Bt Doctur]

Re: Fuel pump question

It looks like the older version that used to have the sight glass,
I`d remove that plug, install a fitting and hose to the carb.
Believe they were called "dual diaphram pumps"

 

[J. Mark]

Re: Fuel pump question

I am going to use the fitting and return line-I understand their purpose and really like the idea of not having gas in my oil if the diaphragm ruptures.

Thanks

 

[Bt Doctur]

Re: Fuel pump question

The sight glass or tube to the carb has nothing to do with keeping gas out of the oil,it`s there to give you a "tell-tale" indication that the diaphram ruptured and instead of dumping the fuel and fumes into the bilge it gets dumped into the carb.