Yamaha 40hp won't start.

[MVP]

I have a fuel problem with my 2001 40hp Yamaha model C40TLRZ.
I quit running like it was out of gas. After a bit I turned the red knob on the carb and it started and ran a bit. I think it's like some kind of reserve fuel???
I just had the carburetors rebuilt and fuel lines and filter all changed including the water separator.
It is getting fuel to the engine filter.
Any ideas would be great.
Mike

 

[99yam40]

Re: Yamaha 40hp won't start.

Does it do any good to pump the primer bulb?
Does the bulb stay firm or is it soft or collapsed?
You need to check fuel delivery system with a pressure/vacuum gauge to see if there is a restriction or a bad pump.

The red lever on the Prime Start system bypasses the carbs to pump fuel to intake. It is used when the pilot jets are plugged or the Prime Start system passages plug to help get back to a safe place. Read your owners manual.


It still has to get its fuel from the same fuel pump/source, so if the pump can't pump fuel none will get fuel to run.