[rterry]

I have a 4 year old Yamaha 225 4 stroke. I have had several problems with the engine stalling. On restart it sputters but will not run even after pumping up the primer bulb. It's been in the shop twice. The fuel/water separator was replaced the first time and the second time the mechanic said he found a kink in the fuel line which he corrected. But the problem persists. The last time it stalled it did restart after pumping up the priming bulb, but I have lost confidence in this engine. I boat on the Cheasepeake Bay and an unreliable engine is a BIG problem. I'm considering putting in another fuel line and bypassing the fuel/water separator on the theory that there is too much pressure drop in the fuel line to the engine. Any ideas?

[ricwing]

I had a fuel problem with my 03 f225 would only stay running if you pumped the bulb,stop and it would die. Ended up being the secondary fuel pump. turn the key to on position and see if you can here it run, it will only run for a second or two. This is an expensive guess.

[rodbolt]

find a real dealership and quit guessing.
ALL yamaha dealers were shipped a fuel system tester as part of the essential tooling, your not asked if you want it or not you just get it and are billed.
this tester allows for checking fuel system vacum with the hull on a trailer and the engine off.
its essential.
then on to the electric lift pump, this is the externally mounted pump, it runs 10 seconds on and 20 seconds off at low speeds, it can be tested with a fuel pressure test guage at the output side once the supply side is tested, it can also be checked electrically with a multimeter while testing the output.
once the low pressure fuel side is confirmed or eliminated repost with the test results.
use the Yamaha dealer locator for your area and find a shop with a master tech or at least look for the school certs on the wall for 4 stroke,electrical and fuel systems.
there are a few other reasons for sputtering and stalling at idle, some are difficult to find but not impossible.

[mt799ph]

these all sound very familar, my 02 F225 does the same thing. i have been told it may be due to a vapor lock. I just found out about a technical bulletin that Yamaha sent to the dealer on 9/23/03. They have a vapor recovery kit that is suppose to cure it. of course, mine is out of warranty now and they want $500 to install the kit. I think they may be in for a little battle with me as no one told me about this earlier. this is not a new issue for me.