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Sorry to leave this thread unfinished. I just forgot about it. It was the injectors. I replaced all with rebuilt injectors and the truck is 100%. Still been running the same fuel mix for over two years since I left this thread. Thanks to all.

It sad to say that I still haven't corrected this problem. I installed a clear fuel line to the injector pump to watch for air entering the system. No air entering the lines. I have adjusted the IP timing to no avail. Fuel filter and housing ruled out as a problem. I'm begining to think that I...

I have installed the rebuilt injector pump ($355) and replaced all rubber fuel lines. I'm still having problems with air entering the fuel somewhere. This leads to no power on hills. No big deal, at least I know whats wrong. The pump shop said the the wmo was not to blame for pump failure. I...

I am sending my IP off to be rebuilt. I have two extra 6.2L injector pumps in a box. I grounded them and briefly touched 12v to the terminal where the pink wire goes. Nothing happened. Is this a proper way to test an uninstalled injector pump? I'm going to send one of the extras in to be rebuilt...

I have vision issues, I can't hardly see the standard format. Sorry, back to the old large white.

Thanks for the link matt, I have narrowed it down to the IP. The IP shaft cracked, but didn't break completely. I don't think it had anything to do with the 80/20 WMO. I have a tank heater and inline fuel heater on the truck so the fuel reaches 175 F before reaching the IP. At this temperature...

I have been running WMO for about six months now. I started with a mixture of diesel (20%) and WMO (80%) filtered to 1 micron. I have recently (four weeks) been running a mixture of 85% WMO and 15% RUG. Yesterday, the truck lost power. Full throttle acheived 5 mph and 1/2 mph on hills. I read a...