Reply To: 25 HP Suzuki Problem

[billw]

You need to check the running fuel pressure. I’m not sure exactly what it’s supposed to be but Yamahas are usually in the low 40 psi range, What you’re looking for is for the fuel pressure to drop off big time, as the engine starts to falter. If you can pump the primer, it doesn’t help and the fuel pressure still drops off, you’re probably looking at a VST filter. This is a small but fine filter that protects the high pressure pump inside the vapor separate tank on the engine. Also, though, check for a filter between the low pressure pump and the VST….those are sometimes harder to see until you trace the fuel system out.

Long live American manufacturing!