1) Power service 911 is NOT for continuous fuel treatment. It is for systems that are ALREADY GELLED UP only. The regular Power service is what you should be using for year round treatment.
2) Not getting fuel flow to the filters is your main problem. If this is an open station IH 485 then they did not have a transfer pump. They depended on the fuel tank being high enough to gravity feed the filters and the injection pump will pull the fuel the little height when lower on fuel. To bleed them I usually opened the bleeder at the filter. Then take an air blow off nozzle and a rag. Remove the fuel filler cap. Put the air nozzle in the tank hold the rag around it to seal it off. Slowly blow air into the tank. BE careful to not over pressure the tank, you can pop the sides out of shape with too much air pressure. This will force the fuel up into the filters. It is best to have two people when doing this. That way you can hold pressure on the fuel while shutting the bleeders off.
Most of the time if you have the fuel tank clear full they will bleed themselves. You just open the bleeder and wait for the fuel to flow.
I have had to park the tractor with the back higher on a bank with a full fuel tank to get some of them to bleed.
3) Check the fuel lines under the platform. I have seen them damaged/crushed shut.
4) See if you have any fuel flow out of the bottom of the tank. You could have ice/water in the bottom of the tank.
The simple truth is that a IH 485 can be a real PIA to bleed at the best of times. The few cab models where better in that the fuel tanks where lower and they used a electric transfer fuel pump. They where easier to bleed. I have seen guys install an electric fuel pump on the open station ones so they are easier to bleed.
They also had the problem of getting small air leaks in the system that would allow the fuel to run back into the tank when ever the tank was very low. Had one that would do this but would not leak fuel. Finally found a bad housing at the primary filter.
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