2006 Mercury 25HP EFI 4 stroke - Won't start

[Duma]

I didn't start the motor at all last boating season and now can't start it. It has electric start and it only cranks without starting. I realize I shouldn't use starting fluid, but I need to give it a quick shot to see if it's a fuel issue like I suspect it most likely is. Where would I spray the fluid to get the best chance of starting the motor.

If you have a picture of the location, that would be very helpful.

Thanks in advance for any assistance.

 

[Duma]

I think I found it. Can anyone verify if this is the best place to spray the starter fluid. It's the forward part of the intake manifold and that grate is called the "Silencer Assembly"

 

[Duma]

No luck spraying starting fluid into that grate. Still only cranks without starting.

 

[Tommyorrison]

Do u have spark.

 

[Duma]

Yes, spark plugs are brand new and have spark. I verified the gap while I had each plug out. All 3 spark plugs had a nice spark.

 

[Duma]

I'll be at the dinghy sometime this week. Does anyone know what the valve on the fuel rail is used for? It looks like a bicycle tire inflator valve and sits on top of the fuel rail. Would it be wise to blow some air through there to see if anything gets unclogged? I'm basically grasping at straws before taking the motor into a professional for service. I've done all the routing maintenance: new plugs, oil / filter change, new fuel filter, new fuel...

 

[Duma]

ROUTINE maintenance. Apologies for the typo...

 

[Mohawkmtrs]

That valve is called a shrader valve and you connect a fuel pressure gauge up to it.

If you are positive you have spark, a fuel pressure test would be the next step.