Home » Blog » Boating Tips » How to Change A Yamaha Fuel/ Water Separator

See our video on How to Check and Change Your Yamaha Outboard Fuel/Water Separator.

There are fuel/water filters on your Yamaha Outboard motor that need to be check and changed every 50 hours. Filtering out water and stopping debris from entering your engine in the first place will always be better for the life and performance of your outboard.


It is no secret concerning all the issues that surround ethanol fuel blends and so because of these problems, Yamaha Motors strongly recommends using a 10-micron fuel/water separator filter,  especially for all EFI or HPDI model engines. They also recommend to check and change your filters more frequently. Because we are seeing so many fuel related issues, we decided to make a video on how you can check and change your fuel water separator.

So watch it and let us know what you think?

Article by Lucile Miller

I was born a commercial fisherman's daughter in Cortez, an old fishing village off the west coast of Florida where you can still experience "Old Florida" and get a really good grouper sandwich. I went to school and became an anesthetist, after privileged years of practice, I jumped ship to work in the family business - Cannons Marina. I love my job and the view. I am crazy about my dog Gnarly. Being out on the water is magical. I still get giddy every time I see a dolphin. Often I brag that I had the opportunity to swim alongside a humpback whale - it was freaky and pretty amazing. Fishing for tarpon and marlin make me happy. My life is no doubt boating, but I also love paddle-boarding cooking and travel. Find me at Google+.

{ 12 comments… read them below or add one }

Danielle T. February 15, 2010 at 12:36 pm

-Nicely done. Great information and guidance.

LucyLu February 15, 2010 at 3:19 pm

Hey Danielle-
Thanks for the feedback!

ANDY T April 18, 2010 at 1:58 pm

great tutorial. Do you need to lubricate the gasket on the filter before installing?

LucyLu April 19, 2010 at 6:44 am

Hi Andy-
Thanks for the comment. In the past, fuel filters were left on for an entire season and lubrication did help with removal and protection of the O-ring. Today we suggest to replace your filter more often and yes, it is a good practice to lubricate the O-ring too.
Good luck and take care-
The Cannons Crew

Mrjustdis September 8, 2010 at 8:35 pm

Outstanding short video. Benny did an excellent job of going through the replacement process step by step. A very good explanation of the different types of filters and the two ways of refuel the fuel/water separator.

Any chance of getting a video on changing the filter secondary filter located in a Yamaha F150 TLR? There’s a small filter inside the engine compartment that’s clear and looks like there’s fuel inside it. Thanks- keep up the great work.

LucyLu September 8, 2010 at 9:00 pm

Hey Mr Justdis!
Thanks for visiting and taking the time to comment on our video. We certainly appreciate that you took the time to give us both your feedback and suggestions for future videos. I will pass your request to Benny! And a new video is coming soon. I pretty sure it is on using an anchor Windlass system
Thanks and visit us again.
Happy Boating,

Capn Curt September 19, 2010 at 9:12 pm

Thanks so much for the video lesson! This is what the web is all about. Next time I’m in Longboat I’ll look you guys up. Capn Curt… Chesapeake Bay Maryland

LucyLu September 19, 2010 at 9:53 pm

Hey Captain Curt!
You are so welcome. And please do look us up when you visit Longboat. We have a really sweet spot here on the key.
Take care and happy boating.

Ted Bradley November 14, 2011 at 11:48 pm

Thankyou…Great information. 7 year old 150 Yamaha serviced annually.It almost left me in the gulf..Engine started stuttering and just made it back to dock…Fuel/water separator,had water and debri in it ,after only 6 months. I’ll change it myself , thankyou.Appreciate the information.

LucyLu November 15, 2011 at 11:20 am

Hey Ted,
You are so welcome!
Good luck and take care.

rick August 22, 2012 at 4:38 pm

The video on changing the exterior water fuel separator was very helpful….quick question, How come when he took off the old filter there wasn’t fuel leaking out of the hoses?

LucyLu August 26, 2012 at 10:00 pm

Hi Rick,
Thanks for the feedback. The filter was removed before in order to save time We did have a bucket and rags to absorb the fuel that does leak out. We do recommend that you have those in place and dispose of them according to your environmental laws.
Hope this helps!
Take care,

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