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Old 09-15-2008, 06:33 PM
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Default Changing fuel Filter - 2006 Mercury Optimax 90HP

I am having difficulty in replacing the fuel filter on my Merc optimax. I followed the instructions in the owner manual which states" use the shaft of a screwdriver between the lugs on the filter cap and unscrew filter". I tried doing this but I can't get it off and I don't want to risk breaking anything. I did notice though a recessed screw (allan key )right in front of the Fuel filter chamber. I was wondering whether I need to loosen this screw in order to get the filter out?

Can anyone help me out?

Thanks
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Old 09-15-2008, 09:05 PM
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Default Re: Changing fuel Filter - 2006 Mercury Optimax 90HP

The fuel filters on the Optis are in there tighter than heck (for lack of a better word). I just changed mine on Saturday. You just have to turn it out and it does take considerable force. There is not a set screw holding it in. I used a large allen wrench to take mine out and it seem to go easier than using a screwdriver with a round shaft.
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Old 09-16-2008, 07:24 AM
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Default Re: Changing fuel Filter - 2006 Mercury Optimax 90HP

Thanks very much Waterbuck!

I will try that!
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Old 09-16-2008, 08:18 AM
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Default Re: Changing fuel Filter - 2006 Mercury Optimax 90HP

There is a tool for removing it. Get one becasue you do not want to break the top off that castle top.
http://item.express.ebay.com/Vehicle...mdZExpressItem
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Old 09-16-2008, 05:07 PM
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Default Re: Changing fuel Filter - 2006 Mercury Optimax 90HP

Thanks Mr. Demeanor! However, I note that tool is for changing a Verado fuel filter. Will it still work on my 90 HP optimax.

Thanks again!
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Old 09-16-2008, 05:20 PM
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Default Re: Changing fuel Filter - 2006 Mercury Optimax 90HP

Quote:
silverado2 - 9/16/2008 6:07 PM

Thanks Mr. Demeanor! However, I note that tool is for changing a Verado fuel filter. Will it still work on my 90 HP optimax.

Thanks again!
Yes. it is the same..
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Old 09-16-2008, 07:02 PM
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Default Re: Changing fuel Filter - 2006 Mercury Optimax 90HP

e-10 tends to expand the red plastic top a little so take the following precautions:

1. only tighten a bit more than snug - don't crank it down, the o-rings don't need much to seal
2. put a dab of dielectric grease on the threads before reassembly - don't slather it on the threads
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Old 09-17-2008, 02:51 PM
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Default Re: Changing fuel Filter - 2006 Mercury Optimax 90HP

I just made a tool since I got tired of busting off the crown pieces and resorting to a channel lock. Yes the crown head pieces tend to bend out when pressure is applied. I found a PVC straight connector ~3" long (cant remember what diameter size - probably ~ 2" or so) that has a small raised ring in the inside equidistant from both ends. The raised ring just fits over the crown of the filter. I used a metal ice pick that is about 5" long with a nice wood handle. The pick part is about 1/4". Drilled a hole through the center of the PVC connector (across the diameter of the connector) centered just a hair below the raised ring. I made sure the hole was a tight as possible on the ice pick (no slop). Stick the pick through the hole, place the whole assembly over the filter crown and twist away. Next mod - make the ice pick metal square instead of round since I really have to put lots of down pressure to keep it on the filter. Actually, a little taper will work to help it dig into the crown pieces just a bit. Caution - a tri-corner file will cut the crown pieces off.
I am so happy since I know I wont have to have my usual battle with this next year.
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Old 06-01-2014, 10:10 AM
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Default 2004 Mercury 90HP optimax fuel filter jammed

Is there a tool to remove this?
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Old 06-01-2014, 10:52 AM
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Default Substitute

The tool works best, but before getting one, I found that a big, flat file worked very good. The edges "dig in" just enough at the bottom of the ears to keep all the turning pressure at the bottom, rather than higher on the ear. Round screwdriver is very tough to use, slips upward
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