Yami 115 4-strk injector problem?

[JPip]

I have a 2004 Polar with twin Yamaha 115 hp EFI 4-strokes. I got water in my gas and the engine stalled. Came in on one engine; the effected engine would not re-start. I know it was water because the red disc in the filter bowl floated up. Since then I pumped the gas through a water separating filter and back into the gas tank (150 gal) until I stopped getting water. Then I started working on getting the engine started. Oddly, only the starboard engine got water; both engines run off the same tank. I assume the starboard pickup is lower in the tank.

I checked the fuel pressure on the effected engine and it was 43 psi. I then assumed/guessed it was the sparkplugs then so replaced them. Now it starts but runs rough. I pulled the spark plugs back out and #1 was dark black. #2 and #3 looked normal. #4 was slightly dark. The engine "roughnes" sounded like it was probably only missing on one cylinder. Also, there is a tapping noise that sounds like a valve but could be an injector.

My question is, could the water in the gas cause an injector to stick? Am I right in assuming that it is the #1 injector that is causing the problems? I am planning to switch injector 1 and 2 to see if that turns spark plug number 2 dark but haven't gotten to that yet. Also, is there a way to clean injectors or is it better to just replace them?

John in Panama City Florida

 

[sdsaw]

Re: Yami 115 4-strk injector problem?

I can't give you an answer but here's some links that may help

http://forums.iboats.com/showthread.php?t=190263&highlight=cleaning+injectors

http://forums.iboats.com/showthread.php?t=144853&highlight=cleaning+injectors

If you need more info try a search for cleaning injectors.

Scott

 

[rodbolt]

Re: Yami 115 4-strk injector problem?

send the injectors to flagship marine. while your waiting clean the vapor seperator and pressure regulator screens.
water in the fuel is nasty.
the tapping is most likly the fuel pump. if they cannot get a good supply they start tapping.

 

[JPip]

Re: Yami 115 4-strk injector problem?

I can't give you an answer but here's some links that may help

http://forums.iboats.com/showthread.php?t=190263&highlight=cleaning+injectors

http://forums.iboats.com/showthread.php?t=144853&highlight=cleaning+injectors

If you need more info try a search for cleaning injectors.

Scott

I cleaned the injectors and it seems to start and idle much better now. It got dark before I had a chance to take it out and run it. I did notice thar there was water in some of the injectors and in the fuel rail when I had them off. I plan to take it for a spin tomorrow after work or on Friday. If it starts acting up while under load I plan to take the manifold off and clean the VST and maybe send the injectors off for a better cleaning. The boats in a boat lift right now and I think I will want to trailer it before pulling the manifold.
John in Florida

 

[rodbolt]

Re: Yami 115 4-strk injector problem?

tear it up, its yours
enjoy your lunch.
if you wish top know the cost of a cylinder head let me know.

 

[Cricket Too]

Re: Yami 115 4-strk injector problem?

By that, I think rodbolt means if you take it out and push it with any water going through an injector, your gonna melt a piston pretty quick.

How well did you "filter" the water out of that fuel.

If it was me I would send those injectors to be cleaned right, and make sure there is no water at all going anywhere near them.

 

[JPip]

Re: Yami 115 4-strk injector problem?

By that, I think rodbolt means if you take it out and push it with any water going through an injector, your gonna melt a piston pretty quick.

How well did you "filter" the water out of that fuel.

If it was me I would send those injectors to be cleaned right, and make sure there is no water at all going anywhere near them.

I put a small eletric fuel pump downstream of the water-separating filter (screw-on canister type) and pumped the fuel up to the filler nozzle and ran it through a funnel that has a water-separating filter in it. I ran it for about 3-4 hours with that setup and should have pumped about 90-100 gallongs in that time. I checked the last bit pumped in a glass jar and it was water free. There was water in the fuel rail after that evolution. I loosened the screw at the bottom of the VST and let the gas (or water, I couldn't tell which and couldn't catch it as it came out) drain out. I also checked the filter bowl on the low pressure side and it was water free. Do you think I have more trapped water on the high pressure side? The manifold and VST don't look to tough to get off but how do you make sure you get all the water out in that procedure?

I definitely don't want to damage a piston; the engine only has about 220 hours on it. If I could get it safely on a trailer it would be a lot easier to work on but I'm quesioning now whether it is worth the risk.

Where do you find Flagstaff Marine?

John in Florida

 

[rodbolt]

Re: Yami 115 4-strk injector problem?

google flagship marine in Florida.
there are two external filterson the engine, a filter in the VST and one in each injector. water tends to form a gel that wont pass them..

 

[JPip]

Re: Yami 115 4-strk injector problem?

google flagship marine in Florida.
there are two external filterson the engine, a filter in the VST and one in each injector. water tends to form a gel that wont pass them..

Thanks. I found Flagship Marine.
This might take a while. I'm determined to find a way to trailer the boat before taking the manifold off. I have a knack for dropping stuff in the water.
John in Florida

 

[rodbolt]

Re: Yami 115 4-strk injector problem?

I know the dropping thing. I can tell you for a fact the rubber seal between the injector and the intake wont float .
but you do need to get the water cleared before anything else. the injectors will spray water just as well as gas.
tends to stick valves and rust cylinderwalls.
drain the vst and flush well,flush the rail and let it run on fresh fuel for 30 mins to an hours.
I wish they would offer us the screens as a replacemnt item but they dont.

 

[JPip]

Re: Yami 115 4-strk injector problem?

I know the dropping thing. I can tell you for a fact the rubber seal between the injector and the intake wont float .
but you do need to get the water cleared before anything else. the injectors will spray water just as well as gas.
tends to stick valves and rust cylinderwalls.
drain the vst and flush well,flush the rail and let it run on fresh fuel for 30 mins to an hours.
I wish they would offer us the screens as a replacemnt item but they dont.

I called Flagship Marine and they said that they are a wholesaler and if I wanted to have my injectors cleaned I would have to work through a dealer. Anyone else have that experience? Is there a work around or do you just go through the dealer.
John in Florida

 

[rodbolt]

Re: Yami 115 4-strk injector problem?

these injectors are identical to many used in the automotive industry.
google injector cleaning services in your area.
in my araea norfolk has one but its just as fast to send them to FL.

 

[Woodnaut]

Re: Yami 115 4-strk injector problem?

JPip - I have a 2006 F90 and I ran into almost an identical problem. Water in the gas, made it all the way through the external 10 micron water-serparating fuel filter and into the engine. I though I had flushed most of it out of the system, but I was oh so wrong. After the boat sat up for 4 weeks I tried to start it but wasn't about to start.

I found that I had 3 siezed injectors - not just dirty, but totally and completely siezed. After finding that out, I started at the tanks, removed the old fuel, cleaned out the tanks as best as I could, and flushed the fuel lines with clean fuel. I also replaced the external 10 micro fuel filter.

I then pulled the VST and every last bit of the fuel components off of the engine and did a complete disassembly and cleaning. I replaced all four injectors and reassembled carefully. The engine started on the first shot and has been running great ever since.

It turns out the the source of the salt water in the fuel tanks was a poorly placed fuel tank vent. I have since relocated to the vent to a location which is much better protected from the briney ocean. I took extensive measures to resolve this problem cleanly and completely, and so far I have had really good results. It seems that just a little sea water in today's ethanol based gasolines is really bad news. Hope this helps - Woodnaut

 

[JPip]

Re: Yami 115 4-strk injector problem?

It took a while in between work travels and other home chores but I cleaned the fuel rail and VST and replaced one injector and now it runs better than ever. The injectors had a 61% variation before they were cleaned by KG Parts. After the cleaning, 3 of the injectors were equal and one was down about 5% so I replaced that one.
I'm somewhat unresolved as to why I got water in the tank in the first place. It is likely the tank vent. I plan to watch it the next time I have the boat out in the gulf to see if water is getting to the vent area. If it is, I will start looking at other places to locate the vent.
Another possibility is from the washdown. My son washes the boat down sometimes after a trip and he said that he was spraying the vents down too since they were metal.
Anyone know if there are vent shields or other ways of protecting the vents from taking on water?
John in Florida

 

[zzzzz]

Re: Yami 115 4-strk injector problem?

there are shields for the vents...they're called clamshells and come in various sizes...aside from the vents-check the condition of the O-ring on your fuel fill cap