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Hi,

Can someone explain why the original fuel filters in the 1.9 TDI engines of the A3 and Golf (with part number 1J0 127 401 A) have a plastic disc inside the filter housing, near the connection with the valve?

It's quite funny, but if you install an aftermarket filter that doesn't have this disc, the car starts much better than if you use an original filter WITH this disc.

Audi says it can't be due to that, but it is. I tested four original filters, then one from an aftermarket supplier, and the car starts much better with that one. The only difference is that the aftermarket filter doesn't have that plastic disc.

The car is a 1.9 TDI Audi A3 from 1997.

Chrisi.

Hmm, maybe it's because the filtering effect of the accessories isn't that high? Let's take apart 2 filters and compare them...

vagtuning wrote:

4 original filters were tested, then one from the accessories was used, and it starts much better. Only this one doesn't have that plastic disc.

Hi Chrisi,

Is the accessory filter a generic part, or can the (brand) manufacturer be identified?

Can you provide a specific part number or similar information?

Hi,

No idea, I don't know who it belongs to... could it be a MAN product or something?

Chrisi.

vagtuning wrote:

I have no idea, I don't know who it's from....could it be a MAN or something like that?

Hi Chrisi,

MANN offers a range of products, including TDI diesel filters.
For me, it's definitely not a no-name brand.

Could you please double-check the manufacturer of the "Besser-Start" filter?