Hi!
Im new here so if the thread is posted in the wrong section let me know.
Ive got a 2008 Gti mk5 stage 1 with fuel pressure problems.
On hard pulls it jerks and in the VCDS logs the pressure drops from 110 bar to 7(with the new HPFP, the old one went up to 129 bar and dropped)
A local company loaned me a HPFP which is swapped but didnt solve the problem.
Fuel filter swapped last year.
The cam follower is also new, doublechecked and its in pristine condition.
There are no leaks from what i can see, atleast around the visible fuel rails and HPFP.
So whats left is the in tank pump and im pulling it out today but i dont know what to look for

Could there be anything else causing this problem or can i just swap out the in tank pump and the problem should be solved ?
Can the in tank be repaired ?
Is a 4 bar pump enough?