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Old 09 September 2015, 11:11   #1
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Fuel Filter Help

The fuel filter in my 1993 Merc 25hp is loose inside the see-though canister, does anyone know whether this should attach to the black assembly at the top or does it seat correctly when the canister is screwed back into place?

thanks!
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Old 09 September 2015, 11:21   #2
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The fuel filter in my 1993 Merc 25hp is loose inside the see-though canister, does anyone know whether this should attach to the black assembly at the top or does it seat correctly when the canister is screwed back into place?

thanks!
Typically, the filter element screws in place, then the bowl screws on?
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Old 09 September 2015, 11:28   #3
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Filter under the cowl? Or an add-on external (Racor type) spin-on?

Actually, doesn't matter that much, as I've never seen one where the filter element is loose. If it's in the motor, shouldn't be too expensive to replace (or buy and compare); the canister type will probably be in the $25-40 (US) range.

jky
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Old 09 September 2015, 11:38   #4
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Have you got a manual that explains it?
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Old 09 September 2015, 11:53   #5
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It looks like this.....
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Old 10 September 2015, 12:23   #6
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Okay, I was thinking of the in line filter. That one in the pic has the replaceable cartridge located by screwing the housing on. Shouldn't be loose, but I doubt it would be a huge problem if it was. The ring is a water indicator - floats in water but not fuel (unless that's an O-ring to seal the canister to the bracket.) Fuel goes in outside the element and is picked up on the inside after it passes through the element.

Are you sure the can (lower number 1) is completely screwed onto the bracket (upper number 1)?
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Old 10 September 2015, 15:01   #7
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Just push it firmly, then screw the bowl up finger tight, making sure the sealing ring is in its proper location.
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Old 11 September 2015, 09:49   #8
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thanks guys, mine doesn't have a rubber washer (3) other than a sealing ring around the top of the canister (1) the filter element just sits loosely in the bowl but wont attach snugly onto the top of the assembly (1) which I assumed it should do.


Thanks to an ex forum member I have a new in-line filter which I am going to fit on the main fuel line which should work better and offer a bit of extra assurance.
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Old 11 September 2015, 10:07   #9
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Quote:
Originally Posted by mattwarner View Post
thanks guys, mine doesn't have a rubber washer (3) other than a sealing ring around the top of the canister (1) the filter element just sits loosely in the bowl but wont attach snugly onto the top of the assembly (1) which I assumed it should do.


Thanks to an ex forum member I have a new in-line filter which I am going to fit on the main fuel line which should work better and offer a bit of extra assurance.
Looking at the nomenclature for that engine, it looks like Mercury decided this system was more complicated than it is worth...

Maybe it would be better just to install a small inline-filter underhood, since you are already running an external fuel filter/water separator?
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Old 20 September 2015, 07:57   #10
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Hi, seems to me, and I have owned a few Mercs, nothing on the merc fuel-filter assembly should be loose at all. Don't risk leakage of fuel or fumes, replace it. Good luck.
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