Yamaha under cowl fuel filters - The Hull Truth

PB1967 · 11-02-2006, 05:09 PM

Greetings Andy,

On another thread I discovered that Yamaha 4 strokes have 3 fuel filters under the cowl?!?!?!? I can only readily recall seeing one. I believe it is on the left rear and in a vertical position. Where are the other two? I still need to order the racor set-up from you. When I do that will I still need to run with, now a total of, 4 filters?

Thanks, Paul

SIM · 11-02-2006, 05:56 PM

Paul,

One engine mounted filter, one strainer screen(VST pump) and the screens inside of the injectors is all that I am aware of. The VST is cleanable
eplaceable, but the injectors ones are not. They would need to be replaced or sent in for disassembly and cleaning. With your hours, it would not be necessary as long as the fuel is clean and the VST strainer was relatively clean.

Get a 10 micron filter installed asap.

Thanks,

Andy

jack14 · 11-04-2006, 02:30 PM

Andy, I have an '06 F115TLR. You recommend in a previous thread to install a 10 micron filter. I'm confused. Is this in addition to the fuel filter installed on the engine...as in an external in-line filter? Or are you saying to replace the existing factory filter with a 10 micron? Either way could you tell me what filter I need to get. I'll order it from you. Thanks. Jack

SIM · 11-05-2006, 01:37 PM

Quote:

jack14 - 11/4/2006 12:30 PM Andy, I have an '06 F115TLR. You recommend in a previous thread to install a 10 micron filter. I'm confused. Is this in addition to the fuel filter installed on the engine...as in an external in-line filter? Or are you saying to replace the existing factory filter with a 10 micron? Either way could you tell me what filter I need to get. I'll order it from you. Thanks. Jack

Jack,

Yamaha highly suggests that you should have a boat mounted fuel filter installed. Yes, this would be in addition to the engine mounted filter. See this thread for a really nice boat mounted Yamaha filter we offer ..... http://www.thehulltruth.com/forums/thread-view.asp?tid=61606&start=1

You can either use the supplied Yamaha 10 micron that comes with the SS kit or you can use a Racor 10 micron element with a clear water bowl, so you can visually check the condition of the fuel with out actually having to dump the fuel out. I prefer the Racor element because of this feature. They are more expensive.

Email me atparts@shipyardislandcom for a quote. Or call 1-800-213-3323 and ask for little oldme. [img]../images/emoticons/biggrin.gif[/img]

Andy

SIM · 11-05-2006, 01:56 PM

Paul,

I was incorrect in my last statement about how many fuel filters that were installed on a 2005 or newer F115. In model year 2005 it appears that Yamaha installed a fuel filter after the VST but before the injectors. The reason behind this filter(my thoughts)is to catch any pump VST debris from the medium pressure fuel pump located inside of the VST.

I will post a picture of it so you know what I am referring to. I would very highly recommend retrofitting your engine with one. I am reallyglad that Yamaha did this. Yes it will require another filter to change but this will lessen the fuel injector restriction issue's from VST pump debris and willincrease overall reliabilty.

The HPDI's have had a filter similar to this since day there inception. Just took a while for them to get the 4-strokes up to speed I guess. This filter or something similar is used on all F115's,F150's,F225's and F250's. Starting in model year 2005.

I am going to have to thank THTer "Inbound" for the heads up.[img]../images/emoticons/thumbsup.gif[/img] I was not aware of it.

Andy

PB1967 · 11-05-2006, 06:04 PM

Cool deal!! I can put one on my 2004 model right? What will the cost be and how difficult/easy of a job is it?

Thanks Andy and Inbound!!!!!

SIM · 11-05-2006, 07:32 PM

Paul,

I will be retro-fitting a couple of F115's this week so I will post some pics. If the location is anywhere close to the VST it will be tough. It sits behind the intake manifold on that engine and that has to be removed to get to. We'll see.

Here is the info I posted on that other thread.

Inbound,

Thank you very muchfor the heads up [img]../images/emoticons/thumbsup.gif[/img] Looks like from what I can tell, that they added that small filter after the VST med presssure pump on the[*]2005 and newer F115's,[*]all F150's,[/list]
The F150 thru the F250 share the same part number. The F115 has its own specific type. The F50-F90's 2005 models and up have there own.

I have to assume that this is to filter out any medium pressure electric fuel pump(VST) debris from normal wear?I kind of wondered why the HPDI's had filters between the med pressure pumps and HPDI pumps, but the 4-strokes did not have any between there med pressure pumps and injectors.Awesome addition by Yamaha. Should enhance reliablity greatly.[img]../images/emoticons/thumbsup.gif[/img]

I have a couple of F115's and F150's to winterize this week. The F115's are older so I will add them as a upgrade, but the F150's are newer so they should have em. Will post some real replacementpics if anyone is interested.

Here is the location on a F150 number15:

[img]../photos/get-photo.asp?photoid=21436[/img]

Location on a F200 thru F250 number 16 . This filter appears to be between the low pressure(suction) and the medium pressure pump. From what I can tell there is no filter after the medium pressurepump on the F200-F250.

[img]../photos/get-photo.asp?photoid=21437[/img]

Location on a newer F115 number 33:

[img]../photos/get-photo.asp?photoid=21438[/img]

PB1967 · 11-05-2006, 09:28 PM

Thanks again Andy. What do you think the "shop time" would be on that job if i were to take it in?

SIM · 11-06-2006, 08:58 AM

Paul,

I will let you know when I do the F115's I have here. Like I mentioned the VST is buried on that engine.

Andy

fish factory · 11-06-2006, 12:21 PM

Thanks, SIM

Looks like the '03 F-225 has the same filter (part #32, sec 4-3 of the Service Manual).

Is there a reccomended replacement schedule for this? On this motor, looks really easy to repair (under plastic motor cover on top).

Or, have the line drawings tricked me?

SIM · 11-06-2006, 02:49 PM

Fish,

I talked with my favorite Yamaha RTA this morning(name with held [img]../images/emoticons/biggrin.gif[/img]) and he mentioned every 100 hours on changing them. That filter location on a F225 will catch the low pressure electricpump debris and anything the other 26 miscfilters miss.[img]../images/emoticons/biggrin.gif[/img]

I have to correct myself again(and this is final I promise)on the 4th F150 filter location. It indeed is before the VST and not after as I originally posted.I am kind of confused as to why it is there since it is pretty much standard rigging practice these days to have a 10 Micron filter installed in the boat as the first line of defense.

Fuel delivery on a F150[*]Fuel tank and pick up tubehose to filter[*]10 Micron filter installed on boat[*]fuel goes from there through the primer bulb and hose to engine[*]fuel goes through a engine mounted filter.[*]fuel goes through the suction or mechanical fuel pumps[*]fuel goes through the 4th filter location in question[*]fuel arrives at VST.[*]fuel goes through filterstrainer at bottom of medium pressure pump in VST and is sent onwards to injectors[/list]
To me it would make more sense to have a filter after the VST. Like the HPDI's. But...what do I know.[img]../images/emoticons/biggrin.gif[/img]

Andy

Piscator · 02-06-2007, 01:59 AM

How do all the engine mounted filters compare to the Racor, vis-a-vis filtration capacity? Are they finer than 10 micron?

SIM · 02-06-2007, 10:25 AM

Rod,

In my opinion the most important filter is the one installed in the boat. Having a boat filter installed greatly reduces the chances of anything even getting to the other filters. The reason the other filtersare even there is for the dealer or boat manufacturer that is not up to speed on proper Yamaha outboard rigging requirements. You would be surprised how many new boats(and older re-powered boats) that do not have a boat mounted filter installed.[img]../images/emoticons/confused.gif[/img]How do I know you ask? By the amount of customers I talkemail with and how many SS filter kits I sellvia the THT.

Hey.....bet its colder by you then it is by us.........[img]../images/emoticons/biggrin.gif[/img]I have a friend that sells log boilersurners on the island hereand he talked with his sales rep in North Dakota.....they had -27 degrees temp the other night. Not windchill but temp. Man and I thought our -9 was bad! [img]../images/emoticons/wink.gif[/img]

Andy

N3NFX · 02-06-2007, 09:48 PM

Hey Andy, long time no hear! Hope all is well with you and the family. Looking over the thread and my service manual, seems my 02 F225 has the mysterious fuel filter aswell! Shown on page 4-3, part number 33 guess I will be adding that to my order (soon) along with whatever it is I need for the VST service. I have never seen any trash at all in the engine mounted filter and with 850 hours on the new mystery filter, I think my Racor 10 micron must do a pretty fair job!

Take care, stay warm buddy...it's even cold in MD this week!
Rob

Piscator · 02-07-2007, 02:04 AM

Andy, You'd be wrong. Veritable heat wave here. Pushing +40 for the last few days. Ain't been cold (-40) all winter. It comes down, bounces off the Rocky Mountain front and heads your way. Where exactly is Washington Island? Wisconsin was one of my stops on my way west. Kenosha. I'd believe it on the Yamaha rigging requirements. No one knows that up here. No one dealer I talked to even mentioned the idea of an in-boat filter. My Mirage is brand new left over 2005 (actually a Serenity2000 - but they changed the name in mid-year). It was a blank-slate fully rigged out by the dealer with a very long shopping list specificed by me. I had water separators on the Yanmar in my last vessel, but never considered for gasoline. Although, back then (1988) EFI was not a feature found in outboards. Okay...guess I'll go ahead on your quote...tiny amount actually compared to what the cost would be with clogged injectors. Big question is: with 400+ gallons run through WITHOUT the filter, should I have the injectors stripped down and all the F150 filters replaced? Performance at season's end seemed fine to me.

SIM · 02-07-2007, 10:35 AM

Hi Rob,

Yes its been a while. Everything here is well and I hope the same with you too.

At 850 hours I would do the VST service and replace that filter.[img]../images/emoticons/thumbsup.gif[/img]

One more thing.....keep an eye on where the drive shaft comes out of the powerhead. You would be looking for engine oil. I have seen two F225's(higher engine hoursthen yours) oil pump seals start to leak. You can check that with just a small flashlight looking under the belly pan.

Thanks,

Andy

SIM · 02-07-2007, 10:41 AM

Hi Rod,

We received your Racor order. Thank you! If you have not lost any WOT rpm you are probably fine.

We are located 90 miles north of Green Bay,Wi. or 200 miles straight north of Kenosha. At the end of the Door County peninsula is a series of small islands and we are on one of those.

I though Montana would have been much colder then it is here. Where is Star Meadow? Far west side of the state?

Andy

Piscator · 02-08-2007, 02:16 AM

Star Meadow is dead in the middle of the Flathead National Forest, a high mountain meadow at 4100 ASL in the Purcell Mountains. Our "standard" weather is -10f to +10f from December to March. A balmy day might be +20f. A cool night is -20F. -25 is not uncommon. -30 is. The coldest I've seen is -42f.

We are 45 miles from the Canadian Border and about 60 from the Idaho Border. Being West Slope (of the Rockies) saves us from the Albert Express that makes live miserable on the East Side - and in the Dakotas. A lot more precipation on average because of the NW influence.

Piscator · 02-11-2007, 02:02 AM

rereading this entire thread makes me think the small screen in the vapor separator is non-functional. With three (sic) 10 micro filters in front of the vapor separator, what can a large particle screen possibly add? Unless it's on the output side and they figure the pump inside there might self-destruct. Even then, what can a screen do? Wouldn't the injectors be toast anyway?