2013 Passat TDI Low Fuel Pressure

[passdattdi]

Correction. The lid does start to lift off with just priming/ignition on. Once engine is started that's when it finally gives way and o ring is squeezed out. First pic is after engine started. Second pic is when priming.

https://imgur.com/a/KeRamar

 

[SaVAGeSoot]

https://imgur.com/a/GEIlgP4

The square sides are where it opened up.
This evidently not OEM fuel filter. Ring comes off without much resistance. Only happens with engine on. If prime with vcds, no issues. I have OEM parts on order. Just baffled that the metal lid gave way as opposed to a hose or something else.

What butcher touched this vehicle previously? There's no way ~5 bar of intank pump pressure would buckle the filter container lid like that. That is surely the result of some ape using a flathead screwdriver to pry the lid off the container during a prior filter service.... there's an actual relief on the side of the canister (on all the ones I've seen) which is there specifically to avoid this type of butchery!
WOW

 

[passdattdi]

Does the fuel return coming back from rail to filter housing increase pressure inside housing? I agree can't just be pressure from lift pump but something is making the lid buckle. Was not like that before and never had issue with it. The filter o ring begins to air with engine on and protrudes through lid. I'm going to check the return rate from rail.