have you changed the fuel filters?

to quickly clean out the tank screen, folks reverse the fuel return and send line temporarily. this will pull fuel from the return and blow it through the screen. it cleans off gunk and temporarily help out.

alternatively, the same effect can be achieved by blowing compressed air back through the fuel send. you could use a tire pump at a gas station if you dont have access to a air compressor.

possibly given WVO usage, you may need the tank cleaned out.

pulling the tank screen on the ground sucks. no two ways about it.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car