On a Ford 555 Backhoe/front end loader tractor, the fuel will not vent out of the top of the new fuel filter, hence, will not bleed up to the fuel injectors. All ports have been cleaned out and cleared but fuel will not go through filter. Gas line is not obstructed. Why won't the fuel pass through the filter to the injectors?

Check out http://www.tractordata.com/farm-tractors/007/6/1/7612-mahindra-4550-attachments.html which may well have your answer.

Sounds like you need to have the cylinder rebuilt. Find you a local hydraulic shop. I have shared a link to my local one so you might use it for comparison. https://www.hyspeco.com/

Repair your vehicle right away. Just click on the link I attached
Ford 550 555 Tractor Backhoe Loader Workshop Service Repair Manual DOWNLOAD

Check the flow at the fuel pump,a filter generally doesn't go bad/plug up within a minute so it may be the pump.Check flow to the pump from the tank also.

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This is for car and truck problems related to Factory Installed Systems not add on aftermarket systems.
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never bleed them at all they bleed themselves ,well on most of the plant i have worked on in my time ,just working the control back a forewards amkes them bleed themselves out

It depends a little on what the temperature is outside. I think I normally run a 10w in my backhoe.

Disconnect the electrical connector for the "Water-In Fuel" sensor from the lower end of the filter housing. Then the filter assembly simply unscrews like an oil filter.After the fuel filter is off, you must unscrew the sensor from the lower end of the old filter and transfer it to the new filter. Then screw the new filter into place. There is a screw on the top of the filter housing to bleed the air from the fuel filter assembly. Loosen or remove the screw and pump the hand pum on top of the filter housing until fuel comes out the bleeder. Then tighten the bleeder and start the engine. If you did everything correctly, it should start right up and continue running. If it starts the dies in a couple of seconds, then you must perform the bleeding process again. (SEE PICTURES BELOW)

Hint: Sometimes it is much easier to get to the filter through the right wheel housing. It may be easier to support the vehicle and remove the right front tire to get to it.

I got this from Haynes Diesel Engine Repair Manual. I bought it for my 6.2.
1. Remove the fuel filler cap and air cleaner assembly.
2. On filters without an air bleed screw, place a rag under the filter to soak up fuel and detach the lower clip FIRST to release pressure and then the top clip. They pop off with a screwdriver.
3. On filters with an air bleed screw (top passenger side) drain fuel from the filter by opening the screw first and the engine water drain valve (engine front near thermostat) if it has one. Detach the clips and remove filter.
4.Make sure the seating surface is clean and place new filter in position. On non-air bleed filters put the upper clip on FIRST. On air bleed filters secure both clips, then close the valve and attach a piece of hose to the bleed port into a pail.
5. Air must be purged BEFORE start up, so disconnect the pink wire from the top of the injector pump and crank the engine in 10 second cycles with a 30 second wait time until clear bubble-free fuel comes out the lower fitting or air bleed. Connect the lower clip on the non-air bleed , close the bleed hose and reconnect the pink wire.
6. Start the engine and let it idle for several minutes to purge any remaining air and check for leaks.
Hope this helps.