Zorba
Active Member
Thought i'd post this DIY for all you 350 MAG owners.
*Make sure engine has not been running for a 12 hours before doing any of this. Obviously you are dealing with GAS so make sure to take all necessary precautions. I went as far as disconnecting the batteries*
1. Locate the cool fuel module. Facing aft, looking at the front of the engine, it will be on the lower left underneath the alternator
2. Unplug the cool fuel sensor. It is on the back of the water separator case. You can see the wires in the photo below.
3. Unseat the 3 retaining screws. Either use a flat head screwdriver or a 10mm socket. They have thread lock on them so it will take a little muscle.
4. Once screws are loose (they don't come out of the cap) pull up firmly on the handle.
5.Remove the cap from the filter housing by turning clockwise.
6.Remove filter from housing by pulling up. This is one seasons worth of crap in this filter.
7. Replace the O-Ring on the cap with the new one provided with the new filter element. IF anyone has the part number feel free to post it as i have somehow misplaced it
8. No picture here but in this step put new filter element in to the filter cup make king sure to firmly press it in place.
9. Replace the cap on the filter cup by turning counter clockwise. No photo but pretty self explanatory.
10. Return fuel filter/water separator cup to the cool fuel module. Make sure to tighten the screws evenly and make sure the o-ring is seated.
11. Properly ventilate engine room. I ran the blower for about 20 minutes with the engine hatch up since i opened up the fuel system. Start engine and check for leaks. If none go boating.
By no means am i stating this is the only way to do this. It is merely a suggested way. This is what I did following the instructions step by step found in my maintenance manual. Heres the link for the 350 MAG
http://mercurymarine.com/_media/pdf...erndrive-models/Non-EC/90-864195072-Maint.pdf
If anyone sees something i did improperly or omitted something by all means correct me. I okay with criticism and won't go crying to mommy
*Make sure engine has not been running for a 12 hours before doing any of this. Obviously you are dealing with GAS so make sure to take all necessary precautions. I went as far as disconnecting the batteries*
1. Locate the cool fuel module. Facing aft, looking at the front of the engine, it will be on the lower left underneath the alternator
2. Unplug the cool fuel sensor. It is on the back of the water separator case. You can see the wires in the photo below.
3. Unseat the 3 retaining screws. Either use a flat head screwdriver or a 10mm socket. They have thread lock on them so it will take a little muscle.
4. Once screws are loose (they don't come out of the cap) pull up firmly on the handle.
5.Remove the cap from the filter housing by turning clockwise.
6.Remove filter from housing by pulling up. This is one seasons worth of crap in this filter.
7. Replace the O-Ring on the cap with the new one provided with the new filter element. IF anyone has the part number feel free to post it as i have somehow misplaced it
8. No picture here but in this step put new filter element in to the filter cup make king sure to firmly press it in place.
9. Replace the cap on the filter cup by turning counter clockwise. No photo but pretty self explanatory.
10. Return fuel filter/water separator cup to the cool fuel module. Make sure to tighten the screws evenly and make sure the o-ring is seated.
11. Properly ventilate engine room. I ran the blower for about 20 minutes with the engine hatch up since i opened up the fuel system. Start engine and check for leaks. If none go boating.
By no means am i stating this is the only way to do this. It is merely a suggested way. This is what I did following the instructions step by step found in my maintenance manual. Heres the link for the 350 MAG
http://mercurymarine.com/_media/pdf...erndrive-models/Non-EC/90-864195072-Maint.pdf
If anyone sees something i did improperly or omitted something by all means correct me. I okay with criticism and won't go crying to mommy
