2012 Isx 2350 475 with codes 4726 and 0559

[ahrenbenjudah]

So I finally got back to this thing on Friday after a couple of weeks dealing with other stuff. I inspected the lines from the tanks to the diverter/crossover valve, and from the valve to the davco. Nothing reared its head. Blew air through the lines and they weren't plugged with anything. I pulled the filter out of the davco and confirmed that when the lift pump is whirring, there is no air being drawn in to the davco container.

My next step is testing the lift pump itself and seeing what I find out. I'm waiting for my new pressure gauges with compucheck fittings on them to come in later this week so that will help with some of the other tests.