No CANBUSS = simpler ..
Check/change the fuel filter. That way you know it is done.
Disconnect the pump, reconnect it directly to the battery ... but with the terminals reversed - + to -, - to + ... this makes the pump run backwards .. any dirt in it should come out.
When the fault happens ... is the pump running/making noise/pumping fuel around? .. you should be able to see the returning fuel to the tank making a flow.
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