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Read articles →This is a real-world fix after an owner ran his 4520 hydro out of diesel on the job. It walks through draining water from the fuel/water separator, opening the bleed knob, and hand-pumping the plunger to purge air, with the owner counting pumps and showing diesel flowing until the engine restarts on the third attempt. Useful for 4520 owners facing the same no-start-after-empty-tank problem.
Posted by an owner-operator (wolfeman1966) sharing a hands-on fix from personal experience with his own 4520.
Drain water from the fuel/water separator at the bottom, open the top bleed knob with a screwdriver, and pump the plunger about ten times until it feels harder, then try starting it.
No, the owner says towing and jamming it into gear is not good and causes gear crunching; bleeding the fuel system by hand-pumping is easier.
The manual says ten times, but the owner did it about fifteen times each attempt, and it took three tries before the engine restarted.
