Yamaha 115 4 stroke High Pressure Fuel Pump

Does any one out there know wh

Does any one out there know what signal the ECM uses to control the on /off of the HP fuel pump. I have a problem in that the motor dies and may not restart for a period of time. The HP pump has been replaced and it still fails. If you monitor the negative side of the pump we have Zero volts when the pump is running and when it fails the voltage goes to 12v. What input to the ECM tells it to turn the pump on or off? This is a 2002 f115. The SECOR book that I have says nothing about this and the schematic is just a block diagram.
Any help would be appreciated.
k

"Kirk, best I can gather from

"Kirk, best I can gather from my Yami manual is the pump is turned off and on by power supplied through the ignition harness.

If the key is on, the pump should be on. If you have replaced the pump and you are still getting an intermittent problem, I would look at the relay before blaming the pump or it's power feed."

"Graham,

Which relay would

"Graham,

Which relay would you be talking about?

Kirk"

there is a relay in the fuse b

there is a relay in the fuse box

Thanks folks. I will check it

Thanks folks. I will check it out and get back with the fix.

k