Diesel Filter Housing Connector for VW Golf V 1.9 TDI

Translated on 07-09-2026, 4:02.

Hello,
Can someone tell me which connection on the diesel filter housing corresponds to which line? (Fuel tank inlet / Fuel tank outlet / Engine inlet / Engine outlet) (See picture).
I couldn't find anything about this enclosure in the forum.
Thank you in advance.

dieselschrauber · Translated on 07-09-2026, 4:03.

There was already a post about this with pictures. The conclusion at that time was that there were two different versions.

A Google search for "diesel mechanic diesel filter connections" provides the pinout diagram for one type of connector in the first result.

Translated on 07-09-2026, 4:04.

Thank you in advance for the answer, Guste100.

guste100 wrote:

There was already a post with pictures about this before. The conclusion at that time was that there are two different variants.

The Google search for "diesel mechanic diesel filter connections" provides the pinout of one connector in the first link.

I already found this post, but since my connections are not the same as the ones shown in the filter, I thought I would ask again.

If I follow the mapping from the thread mentioned above, the connections would be:

1 = Supply line to tank.
2 = Return line, tank.
3 = Motor return line.
4 = Engine coolant inlet.

Do you think that's correct?
Thank you in advance.

Translated on 07-09-2026, 4:06.

Suggestion: RLF (roof rack) or a similar product suitable for the vehicle.
It's always a good idea to have at least some basic documentation before you start working on something.
hg
Herbert.

Translated on 07-09-2026, 4:06.

Herbert wrote:

Suggestion: RLF (roof rack) or a similar product suitable for the vehicle.
It's always a good idea to have at least some basic documentation before you start working on something.
hg
Herbert

Hi Herbert,
"Thank you, that was the right guide, I replaced it and the car is running like new again."

Translated on 07-09-2026, 4:07.

I checked the system and found that the motor's forward and reverse functions were not working correctly.
Correct, as shown in the attached photo.

Perhaps this will help someone else.

Translated on 07-09-2026, 4:08.

dosenwerni wrote:

I was here and noticed that the motor's forward and reverse functions were not working correctly.
Correct, as shown in the attached image.

Maybe it will help someone again.

Arrows without any text explaining what they are or which vehicle they are for, along with an image that you don't have the rights to, are of no help to anyone!

As mentioned before, there are several variations:
Connections Diesel Filter