Been there, done that. Ended up replacing the filter.
An old filter can cause problems due to restricting flow and increasing vacuum(?) in the line to the low-pressure pump, which can then overcome a tired o-ring and suck in air.
Had a similar situation: a lady parked her A170CDI (same fuel system) in front of the office where I work, ran some errands and couldn't start when she returned. We filled the fuel filter so that the engine could start, theorizing that the low-pressure pump has more oomph at idle than when cranking and it will overcome the restriction of a clogged fuel filter. It got her out of the field of view, so I suspect it worked.
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Originally Posted by Barefoot
Hey I wonder what happens if I plug this wire in therAAAAAGGGGGGHHHH............
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