05 F115 issues

[Av8erdunn]

Sounds good.
Thanks for your help.

[Av8erdunn]

My primer bulb never actually gets hard as it has on other boats. I am installing a new one while I am reworking the entire fuel system from tank to motor along with cleaning injectors and replacing all filters. but to answer your question, no as of yet i havent. I need to remove my yamaha fuel flow transducer and check/ replace it. Its not working anyway.

[Av8erdunn]

It does not.

[Av8erdunn]

let me look about the junk pile tomorrow.
having never broken that part I do not know.
but I do have a few parts VST's floating about.

Any luck finding a replacement?

[Av8erdunn]

Got my injectors back yesterday from Mr. Injector!!! Two of them were clogged; they had a flow of 32 and 36 prior to cleaning. After cleaning they had a flow of 62 like they should. Hoping this was the problem all along, will be reassembling this weekend.

[fairdeal]

when I had injector clogging on my F90 I was surprised that an apparent small bit "off" made a huge difference.

Before cleaning, my four tested at 88, 92, 92, and 96% of rated flow.

Doesn't seem that bad, but the engine would idle only, and completely "break up" under load

[Av8erdunn]

I am hoping that's the case. I got her put back together yesterday and right now I am draining the fuel tank to get the ethanol gas out. I have plumbed a in portable tank just to test with and I am also waiting on my 2micron racor fuel filters to arrive. Keeping my fingers crossed that this is going to fix it. It's going to be a few days before I can run her but I will let y'all know how she does. Thanks for all the help.

[pstephens46]

I am hoping that's the case. I got her put back together yesterday and right now I am draining the fuel tank to get the ethanol gas out. I have plumbed a in portable tank just to test with and I am also waiting on my 2micron racor fuel filters to arrive. Keeping my fingers crossed that this is going to fix it. It's going to be a few days before I can run her but I will let y'all know how she does. Thanks for all the help.

Wasn't there discussion about some engines that are unable to use 2 micron filters???

[fairdeal]

Wasn't there discussion about some engines that are unable to use 2 micron filters???

Its not clear me to what the value would be, anyway, although who would not feel "cleaner is better".

Rodbolt teaches us that, far downstream of that 2 or 10 micron filter canister,
both the LP and HP pumps generate "brush dust"


I have not seen it described in any Yamaha document,
but the "VST Filter" on my F225 - a screen, really -
appears to my eye to have "openings" of >200 micron across


I have not seen a size rating reported for the "basket filter" at the inlet of the fuel injectors - not gotten a look at them.

But seem to recall reading that orifices on a Port Injection nozzle are around 200 micron in diameter.

[pstephens46]

Its not clear me to what the value would be, anyway, although who would not feel "cleaner is better".

Rodbolt teaches us that, far downstream of that 2 or 10 micron filter canister,
both the LP and HP pumps generate "brush dust"


I have not seen it described in any Yamaha document,
but the "VST Filter" on my F225 - a screen, really -
appears to my eye to have "openings" of >200 micron across


I have not seen a size rating reported for the "basket filter" at the inlet of the fuel injectors - not gotten a look at them.

But seem to recall reading that orifices on a Port Injection nozzle are around 200 micron in diameter.

I assumed the 2 micron may be too restrictive in some's opinion. I can't recall the details.

[Av8erdunn]

There have been numerous people having success running the 2 micron with outboards up to 225 maybe more. It has a fuel flow of 60 GPH so its more than enough for a little 115. That being said, it will clog up sooner but I always keep a spare on the boat anyway.

[Av8erdunn]

Took her for a test ride and she runs so much better. I only had a temporary 6 gallon tank and the boats tank was empty and I was a little disappointed in the speed. I realize it's only a 115 on a 19' boat and that's half the problem. I was getting about 37mph at about 5700rpm. I was hoping for 40 with a light load but I don't see that happening. I am going to put 50gallons in this weekend and see how she does. Thanks again for y'all's help.