225 Starves for gas after a long Idle.

[AboutTime236]

I have a 2004 225 4 stroke yamaha has 560 hours. Runs great and has had all services up to date. Noticed that after a long idle time that the motor RPM will get erattic and when i go to get on the gas it dies on me. I have been able to recognize by pumping the priming bulb that this issue is relieved. But again it will come back. Now she will run wide open all day without fail and for the most part idle for a good long time. But the reoccuring sputter will return. This can be issue when i am in a tight spot and a dying engine is the last think you want is a sputter. Does any one have any suggestions. Remember all services have been done she never misses her check ups. Does anyone have any advice for me? Thanks Jack

[knottonight]

I have the sameproblem. Either at idle or *****ing. It's like the engine loses prime.

[mitch]

when you are running under 1200 rpm the low pressure pump runs intermittently i would be looking for a vacuum leak sucking air some where and losing prime are all lines clamped and tight.

[SkinnyRaven]

Look and see if there is a check valve where the fuel line leaves the tank, may be sticking.

[RangerBill]

Got the exact same problem on my 05 F250. Tomorrow will be taking the boat out with a separate tank to eliminate the "boat fuel system". Willlet you know the results. If it still starves for gas on the separate tank, I'm thinking it's the low pressure fuel pump Hope not because they are $$$$$$.

Bill

[mitch]

check the check valve that is cable tied to the low pressure fuel pump as it may be jammed open.

check low presure fuel pump pressure

[robcole32]

check to see if the vent on youre fuel tank is open/if not a vacume will hapen

[willied1]

robcole, where is this vent typically located? I have this same problem with 2003 F225 (2002 build date). I've replaced the hose from the tank to water separator, filter, filter assembly and primer bulb thinking that air was being pulled in from a leak in the system.

It started as losing the prime at idle, no issues when going at higher speeds. I'd prime the bulb tight and then be able to go on. Then it turned in to me being unable to get a prime at all, thus the replacements mentioned above.

The dealer says I need to have them do a system tear down and try to find the issue. I'm not too crazy about thinking they could spend many hours trying to figure this out and then the cost of repairs and parts.

Thanks

[AboutTime236]

225 starving for gas

Well gentleman had the idler control valve replaced and that was not the answer. There was a recall on the vapor seperator tank, but I had that checked and was functioning properly. Low pressure pump is 465.00, there were no computer failure codes for that. All fuel pressures were normal. It always came back to the primer bulb, because as soon as I pumped it up and tight the engine came alive and I could go as fast and as long as I wanted. It is interesting problem. P.s. I removed the ball valve from the top of my sailfish tank because the ethenol had corroded and caused it to rust. So she is in the hospital getting a new primer bulb. I will keep you all updated. For those of you with 2003-2004 models make sure you have a VST Some models did not have them from the factory and it is still under warranty for installation and labor cost.
Jack

[mitch]

Did you check the relief valve that is cable tied to the low pressure pump a one way check valve. that is in a fuel line loop from the vst to the inlet side of the low pressure pump .

under 1200 rpm the pump runs 10 sec on 20 sec off if this valve is open it will not force enough fuel into the vst.

Have a look here it is number 1 in the parts list as a relief valve you can also test it but in the yammy w/shop manual they do not give you a value for crack pressure .

Yamaha Outboard Parts 2004 F225TURC FUEL INJECTION PUMP 2 Diagram

what was the recall you speak about vst?

Should of mentioned that yds will not show codes for the fuel pumps you can only do a static run test to make sure that they are turning , but you can do fuel pressure tests

[willied1]

On the "recall" he may mean the service bulletin for the vapor lock issue. His issue as described is what I'm experiencing and after consulting the second Grady dealer in the area, the service manager said I probably have vapor lock given the heat here. I just checked and I don't have the vapor recovery system that was the answer to the service bulletin (but only to those who asked or had the issue several years ago). He said it's just something I have to live with until it cools down unless there's something else going on to cause the engine to be running hot. He said to get into the habit of priming the bulbs after I sit for awhile to try to push the vapor through and that likely will resolve the issue. So I'm in the process of replacing my thermostats as a maintenance measure. The water pumps are new.

[wiseguy8802]

Hello all. I too am suffering from the shutdown after idle. Twin F200's run great after warm up but it seems after prolong idle my Port engine dies. Prime her up with the bulb and wa la. Off and running. Im going to swap the check valves and see if the problem follows. I know my VST and related filters are good to go. so this is my next step. Will update here with my findings

BTW. Thanks to all the great support from the Senior members. Cheers to you!

[willied1]

I'm now convinced that I need the vapor recovery kit that Yamaha saw fit to build and release for my engines some years ago but now refuses to source and release to their customers in need. I also think that the failed experiment of this ethanol short-sightedness is causing the gas to vaporize in my ill-equipped Yamaha engine during this hot Florida summer. I'm growing more angry by the day and after the more technicians I talk with. If the engines come standard with the vapor recovery kits at present and there was enough of a problem years back to warrant a fix then how on the world can they neglect their customers now and not simply have the necessary parts available for purchase??????!!!!!!

[wiseguy8802]

Ok all. I know its been awhile but duty calls. I did swap out the "releif valve" on the return line. Test ran my rigg and it ran just like it's supposed too. THe valve would not hold a vacum either way, not to mention looks like it may have damage from what I call the "ethanol effect"

Once again thanks to all that contributed previously

[willied1]

Wiseguy, where was this releif valve? Thanks,