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Man fuel issues in diesels are a pain in the cock.
The diesels I run are way different than those little TDIs. The first thing I’d do for any potential fuel problem is change the fuel filter. It’s the cheapest and most likely to cause restriction.
If it loses pressure on the fuel rail or an injector is bad it should throw a code. Definitely check those. I’d think if restriction was coming from the fuel filter it would have a code for that too.
If air is getting in, more than likely diesel is getting out. Look for a fuel leak. About the only exception would be in the intake side of the injection pump. Potentially a cracked fuel line or fouled seal could cause you to suck air. It’s possible but typically failures are caused on the pressure side - fuel lines and injectors.
Visual inspection then run codes is my advice.
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