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A loss of hydraulic fluid can cause a serious situation with the mast. It would cause the mast to lower slowly or suddenly. Also if there is a break in the chain that holds the mast at a certain level, it would cause it to fall suddenly.To reduce the pressure in the fuel line , the forklift operator should
Open the hood , look to the right, to the back, just to the left of the master cylinder, in the fuel line. relieve pressure on fuel line first. To reduce fire risk when you take off the filter.
you hook up a fuel pressure guage to it to check the fuel pressure
The larger line is the pressure line, the smaller line is return.
Restricted fuel return line or a faulty fuel pressure regulator.
There is a special adapter that is needed, you remove the fuel line to the fuel rail, install the special adapter and then install the fuel pressure gauge to the adapter and reinstall the fuel line to the adapter.
Well, i suppose if your injectors are using all of the fuel (super rare) then there would be no fuel coming back to the return fuel line. However, since you say there is NO fuel pressure, I would check out the fuel pressure regulators and the vacuum lines connected to them. The pressure regulators are located on the top of the engine and are directly in line to the fuel line. They are connected between the fuel rail (where all the injectors are fed from) and the metal fuel rail on top.
It doesn't have a vacuum line attached to the fuel pressure regulator.