hoping not fuel pump

[gabxes21]

i own a john deere x575. i am starting to have a fuel issue. i have replaced the fuel filter and the air cleaner while i was at it. when i get down to half a tank the tractor wants to stall out or does if i am on an incline. when i look at the fuel filter, the fuel is barely there or very low compared to what should be in the filter. i am opening to ideas at what it might be before i start tearing the tractor apart to get to the fuel pump

 

[ILENGINE]

Does the fuel pipe go inside the fuel tank from the top. Possibly hole in suction tube in fuel tank.

 

[bertsmobile1]

Most likely crud blocking off the fuel suppy inside the fuel tank.
Some Deers have a replaceable filter inside the tank ( to protect the fuel filter )
You will be amazed just how effective a plug a couple of blades of grass can be.