Yeah, it was faulty lift pump...I read the whole topic, this is excellent!
My pump is 1J0 919 050 VDO from 2000.
On ignition I got about 50cc, while at 12V, 2 Litres per minute.
Cleaned screen, it was dirty, now getting 2.2 Liters.
Is it bad lift pump?
Also can I take motor from petrol lift pump? Is it same as diesel?
Not whole unit, just motor (electric part)
My Mk4 has long cold start especially when stays for 1-2 days or more, changed 3 tandem pumps, complete head with injectors seats and seals