Compression Ignition Addict
Join Date: Sep 2012
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Mine gelled last week too. I also got the same codes as you, although not at the same time. I got the low rail pressure code when it died. Once I got it all cleaned out and new filters in, I got the low injector pressure while cranking. After a couple tries it started rough, with a little help from my foot on the accelerator pedal, but once it was up it was fine. Hopefully yours is fine too.
The secondary filter isn't the one that gelled on mine though, it was totally fine. The primary filter, the lower one on the frame rail, was where the problem was. It was covered with crap. Change your filters, especially the lower filter, and I bet things get a lot better.
The water separator is before the filter, so it'll work fine even if your filter is completely plugged (which it probably is).
I use the white bottle of Power Service too. It didn't keep it from gelling, and it was only -6 here.