Yamaha GPH meter only works 1 on dual

daleatskiworldorlando · #1 June 27th, 2007, 01:17 PM

Hi all, a friend has a off shore boat with dual Yamaha OX66 250 HP outboards.

The boat and engine are about 7 years old (2000)

My question is on the Yamaha fuel meter (GPH) gauge. It works fine on one of the engines but not the other. When one of the engines is shut down the gauge goes blank. Maybe it is getting powered up from only one of the engines.

Anybody know if there is a service manual that covers the wiring and trouble shooting of this system?

Thanks, Dale

Ray Neudecker · #2 June 27th, 2007, 11:43 PM

Try the search for fuel managment systems. There have been a number of posts on it.