On all the diesels I have been working on I had to bleed the primary filter first, then the secondary filter, then the pump. The operator manual tells what screw on the pump to bleed first and second and so forth.
That is if you have the operator manual.My feeling in this is that if the engine is running and there is no problem, you stop the engine, and replace the primary and secondary fuel filter, and then it will not start. I have felt that the reason for this is that when both filterhousings are empty, or full of air, there is not enough feeding pressure on the injector pump and it will not start.
If you then start bleeding air at the injector pump sometimes it looks like it is clean fuel coming out, and it is, but it is still a lot of air in the fuel filters. If you had continued to pump the pre-fuel pump by hand for an eternity you would see that sooner or later a lot of air would come out of the fuel pump. But, to fasten things up, I will recommend bleeding the primary fuel filter first and see that clean and bubble free fuel comes out. And when that happens, bleed a bit more, a bubble might be stuck and come out a little after. When you feel that this is it, a good tip is to tighten the bleeder screw while your friend operate the fuel pump lever for pumping, and not while sucking. You actually need to be 2 people to do an efficient bleeding on a MF 35 if you have the Perkins diesel engine, because the pump lever is on the other side of the tractor. Continue to the secondary filter and do the same as with the primary filter. The primary filter is closest to the steering wheel, and the secondary filter is closest to the injector pump. Before bleeding, have you cleaned the glass bowl ? After the secondary filter is done, proceed to the fuel pump. And please notify us when the engine runs and everything is ok. We are all curious folks and wants to know the result.
Bill
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