2012 Isx 2350 475 with codes 4726 and 0559

[ahrenbenjudah]

Hey Rawze,

Yes. I replaced the fuel pump head and the barrels, tappets, rollers and plungers completely.

During this I have also replaced the Fuel Rail relief valve, and the fuel pressure sensor.

Also, I just noticed, that in my previous post that the commanded voltage on the actuator looked like this:

Fuel pump actuator commanded current: 0.00mA
Fuel pump actuator duty cycle: 5%
Fuel pump actuator measured current: 62.5mA
Fuel pump actuator position: open

so it was commanding 0ma, but was reading 62.5ma. I'm unsure if that would cause the problem i'm having, but I am attempting to get back on to testing with it today.