1999 Yamaha Vmax 150 0x66 fuel problems?

[wpgriverguide]

Running a tournament last week, my 1999 Vmax 150 trp 0X66 fuel injected motor bogged down and stalled anytime i went over 3/4 throttle.

I checked the usual and there is no water in the tank or in the system.

Has anyone had this problem before?

It runs normal to 3/4 throttle put anytime i go over that it boggs and stalls out. Any ideas?

 

[Bob Gilvary]

Re: 1999 Yamaha Vmax 150 0x66 fuel problems?

I just corrected such a problem with a 2000 model 150 throttle body injected.

I removed the "fuel delivery assembly", opened it up and removed what was inside it.

It appears to be a check valve with a fancy name, or a back flow preventer. After unscrewing it and taking out the piston and spring, I put it back in line and the motor runs fine after the water test.

You'll find it in line, between your engine fuel filter and the fuel pumps.

 

[wpgriverguide]

Re: 1999 Yamaha Vmax 150 0x66 fuel problems?

you dont hav a picture of the piece do you?

 

[Bob Gilvary]

Re: 1999 Yamaha Vmax 150 0x66 fuel problems?

http://www.boats.net/parts/search/Yamaha/Outboard/1999/SX150TXRX/FUEL/parts.html

Her ya go!!! item 24

 

[wpgriverguide]

Re: 1999 Yamaha Vmax 150 0x66 fuel problems?

Did you replace it? Or just take it apart and put back in?

 

[Bob Gilvary]

Re: 1999 Yamaha Vmax 150 0x66 fuel problems?

As stated above, I took out what was in it and put the assembly back in without the piston and spring.

It could also be an issue with your anti-siphon valve at your fuel tank pick up.

Read my post below yours.

 

[wpgriverguide]

Re: 1999 Yamaha Vmax 150 0x66 fuel problems?

what was in it? Junk?

 

[Bob Gilvary]

Re: 1999 Yamaha Vmax 150 0x66 fuel problems?

Nothing in it that I could find as far as trash. I figured it wasn't operating properly for whatever reason.

I couldn't blow through it against the arrow/flow, and when I blew in it in the direction of flow, it would stop up quickly then open a bit then stop up again, just like the engine was doing when stalling.

Maybe someone on here can give specifics as to what a fuel supply assembly is supposed to do.

 

[wpgriverguide]

Re: 1999 Yamaha Vmax 150 0x66 fuel problems?

Yamaha is 1 week away from getting me the item 24, I have since replaced the plugs and the fuel filter. Any other help would be great!!!