Since I don't want to be one of those guys who does not post the solution: In case someone faces the same issue - resolved by replacing both the fuel pressure regulator and the fuel pump. Both were faulty.
Bosch high PSI fuel pump after 57,000 miles. That's quality right there.
Only US Bosch replacement- https://www.nostrumshop.com/product/vw-mk6-gti-high-pressure-fuel-pump/ 2145 Get the check book out........
I'd go with Bosch. A fuel pump isn't something I'd want to cheap out on and I'll have to get the OEM for something like that.
Bosch. Always use Bosch for the pump. They're the OEM and the vastly better service life than the cheap brands is more than worth the extra cost.
From what I’ve seen on here, the consensus is that the Bosch fuel pump is the only one that won’t die immediately
Hopefully I can get some more years out of this Bosch.
since the original pump (aged) is hardly safe over 200whp imo; esp with increased rail pressure.
After wiring the fuel pump relay terminals together to bypass the relay entirely, after 40 miles of heading back towards Arkansas it died on me again with the exact same behavior as before.
Fuel-pump... intank Walbro 255lph gave it all up today as well.. i knew this was gonna happen so i alway drive with one extra stock pump just in case.. been there b4.. I can now feel a bit diffret performance with th stock pump and this setup... Car runs more rough in the engine.. and jerks sometime.. i don't even think the stock pump is good to handle 100% 95 octane fuel.. i recommend over and over dimensioned when touching 300hp... on 95 octane... The inline walbro solution should be good.. as mentioned b4 in this forum.. I have an Bosch 044 in the garage that im gonna try in tank. Think the intank walbro runns fine with E85 if you run 150hp.. but with 300hp.. it have to work the as off to deliver E85.. with poor lubrication
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