Hello people,
Since a very long time ago, when the car gets hot (or has very low fuel tank level), the car runs incredibly bad, it vibrates like crazy, when my fuel level is low, i see air in the line 1 (or equivalent)(diagram below), i deleted my fuel heater because it had a mystery leak and it is stupid expensive and here in paraguay it's very hot, so i skipped it with a piece of clear fuel hose and an aluminum hose connector, for diagnostic purposes
When my tank is full, there is absolutely nothing in line 1, line 2 is fine too, but line 3 is full of air, so that brings me to bad in-tank and chassis fuel hoses, and for the second thing, potentially bad shut-off valve
Could the shut off device be repaired or rebuilt, if not i will be happy to buy a new one, as sure it will be the same or worse than mine

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tank junk, fungus. tank has screen but you might clean tank

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

Yes, i know the fuel tank hoses are junk because when fuel level is low you see air right before the prefilter, in line 1
But when i see no air in line 1, 2 is air-free, line 3 is full of air, which pinpoints to a ruined shutoff valve, tried a fix that i found on benzword, and it didn't work, so it needs to be replaced

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1998 W202 C250 TURBODIESEL MANUAL TRANSMISSION WAGON
The best spec W202 out there
2004 F350 6.0: replaced all HPO system a year ago, moneypit