Re: Mercury 250 Verado Problem
I thought the same thing after 2 times. Carried it to a dealer 90 mile away and he said warrant was out!!!
1st time they put factory fix when it FUEL locked my engine , tore up fly wheel, starter gear and starter. $2000 warranty.
I decided to fix it at a local shop where the guys are great and we investigated the problem together. (I do some failure analysis work professionally.) I have ~120hrs. Surprise during my investigation. YAMAHA motor! Mercury fuel module >made Meriza-manelli with Weber fuel regulator and great Walbro Italian fuel pumps. Yamah does not use the regulator in the fuel module.
You may have a Yamaha motor.
I found out that Mercury does not make a 4 stoke. They buy Yamaha motors and ....
The vinyl hose to the fuel regulator in the fuel module needs to be changed to "Buna-N rubber" or it will happen again. I have a 115, 4 stroke efi and it happen twice. We made the change on our own. sending recommendation to mercury to consider since they put their fuel module on a Yamaha. The factory hose will not last if it is the vinyl type as a number on mechanics have reported. They say it is not in gas but there is external gas in the module ~1/2 way up to the float. The hose is a vacuum hose from the intake manifold, if it is like mine. Vacuum controls the fuel pressure regulator. Mine popped during idol because the vacuum is the most.
You can follow it and unplug it at the module to test. 'm not a mechanic just fixing mine with a great mechanic and looking for others with same issue on Iboats. get buna-n rubber from McMaster.com
We are trying to eliminate this issue.
had to soften the hard rubber with some heat. Then bend to fit. Tried copper but could not get fitting to SEAL and it smoke when it sucked fumes in around the fittings.