audifan
A2OC Donor
That part number is for the valve for the activated charcoal filter and not a fuel non return valve.
This is only a suspicion, but the value read by VCDS, and probably the value stored, may well only support 3 digits.thank you very much for the contribution. unfortunately I have not yet managed to do the test as indicated in the video, I hope to succeed in the next few days. in the meantime I found an article that talks about the HP pump of FSI engines and reports 110 bar as an operating value. https://www.notiziariomotoristico.com/articoli/6553/novita-in-gamma-le-pompe-ad-alta-pressione-huco
I may have found the fuel non-return valve part number, could you please confirm? 058133517B
The recent figures for fuel pressure retention after engine off indicate there's a non return function somewhere.Not even sure if there is a check valve in the system.
If we believe this old schematic ...........
The recent figures for fuel pressure retention after engine off indicate there's a non return function somewhere.
There must, (I think), be a pressure relief function too, maybe the regulator does both?If we believe this old schematic ....
View attachment 103228o
.... then pressure after shutdown can only be dissipated three ways 1. 'back out' through the HPP - by design not, 2. By opening the injectors - no 3. Via the Regulating Valve - clearly shut.
I think Gorevolution picked up non return valve from the video which was a generalised look at using VCDS to monitor pressure in the fuel rail and a non return valve seems to be absent with our FSI. The after 2 minutes monitoring I take as a test to see if in a system that has one the valve is working correctly.1 I suppose in a sense the Regulating Valve is acting as a non return valve.
Andy
Andy