What fuel return rail for 1.8T BFB

[marto7]

Hello.I have Audi A4 1.8T Quattro with BFB Engine.My fuel rail is without return line and i want to make it like B5 - With fuel pressure regulator and return line on Fuel rail.I know i need to change the filter but what rail i should use ? My stock FPR is 4bar and i need 4bar from 1.8T A4/A6 or passat but are all of 1.8T is compatible ? I have a list that i see the type of injectors that used in different 1.8T engines but are the EV6 (for example from AEB) is compatible with EV12 injectors (my car) ?

[Matt Devo]

you want to use the fuel rail from an AWM: 06B133681. Same injectors will fit as your current rail, only difference is the return line/FPR.

[marto7]

If its only this i hardly can find it here in Bulgaria.Here is my list with different injectors on 1.8t engines
https://ibb.co/gMyLcH

[J_L]

Here is how I did it on a BFB engine
https://www.audizine.com/forum/showt...em-into-B6-DIY

[marto7]

Did you use AEB rail (stock ev6 injectors) on BFB engine ? I readed this article but i think you changed the engine head with AEB one.If AEB is compatible i can find

And where are the FPR hose goes ? To the intake manifold ?

Now i see you used injector spacers.I dont want to use spacers and for this is my topic.Why i need to buy spacers that are more expensive than rail, when it have Bolt-on rails for me.

[Matt Devo]

Did you use AEB rail (stock ev6 injectors) on BFB engine ? I readed this article but i think you changed the engine head with AEB one.If AEB is compatible i can find

And where are the FPR hose goes ? To the intake manifold ?

using the AEB rail on a BFB manifold will require spacers. You'll want to connect the FPR directly to the manifold, yes. I added a nipple where the AWM manifold has one, directly across from the FPR

[J_L]

The ecu on the B6 is designed/tuned to run static fuel pressure, so leave the vacum port on the fpr open.

[marto7]

The ecu on the B6 is designed/tuned to run static fuel pressure, so leave the vacum port on the fpr open.

Are you sure to leace it open ? What is the difference if it open or connected to manifold ?

[Matt Devo]

Are you sure to leace it open ? What is the difference if it open or connected to manifold ?

open = run at static FPR pressure (4 bar)
manifold = run at static pressure + manifold pressure (above atmospheric)

[marto7]

Thanks good to know. I will leave it open. I found 1.8T APU rail.This will fit bolt on for me right ?

[Bische]

1.8t AEB rail, comes with a 4bar FPR also

[marto7]

Yes but for AEB rail i need injector spacers. I preffer bolt on solution.I found from APU. I think its bolt on but want some other opinions too.
Can i trust this list, and if its with 4bar and EV12 injectors original i can install it directly:

[Bische]

Yes but for AEB rail i need injector spacers. I preffer bolt on solution.I found from APU. I think its bolt on but want some other opinions too.
Can i trust this list, and if its with 4bar and EV12 injectors original i can install it directly:

You don't need any spacers with the AEB rail mate

[marto7]

But Matt Devo up there told that i need spacers for AEB rail on BFB manifold. I think because AEB comes with EV6 injectors and my BFB is with EV12 injectors.

[Matt Devo]

You don't need any spacers with the AEB rail mate

you do need spacers between the rail and manifold when using a non-AEB stock manifold (or, at least you do with an AMB manifold; the AWM rail fits correctly)