Pump Settings & Fuel Consumption: Does It Change?

Golf4, ALH engine, Highline trim, 188,000 km, all original.

Hello everyone,

'I adjusted the pump setting slightly about two weeks ago. Before that, according to the TDI graph, it was a bit below the blue center line. Now it's a little higher, just above the ideal line.'
I did that to improve the warm-up performance.

Interestingly, at the same time, MFA is also calculating consumption differently.
The consumption has decreased slightly (calculated from 5.2 to 5.0).
However, the MFA reading shows 10% less, at 4.6-4.7.
That really shouldn't be the case.
I'm starting to think that the pump is quite worn out.

Could that indicate something?

No, because for the multi-fuel adaptation (MFA), the injection quantities determined according to the characteristic map/driver request are used.

Best regards, Matthias.

I've now driven another 1000 km.
The MFA (Multi-Function Display) shows 4.7 liters, but the actual fuel consumption was 4.98 liters.

Previously, the MFA was surprisingly accurate (within +/- 0.05 liters).

I don't understand it; besides a slight adjustment to the static pump setting, everything is the same as before: the same driving style, the same route, the same tires, the same gas station, etc.

I have the impression that the calculation is particularly inaccurate at low engine load.
Can someone explain this?

Sure, here is the translation of the text from German to English:

'MFG' stands for 'Mit freundlichen Grüßen,' which translates to 'Sincerely' or 'Best regards' in English. It is a common way to end a formal letter or email.

No, I don't have an explanation readily available right now.
For many AI systems, you can customize the Multi-Factor Authentication (MFA). STG17 --> 10 (Adjustment) --> Channel 03.

Best regards, Matthias.

I had to adjust that setting previously because it was displaying too much information, which is also why I suspected wear on the pump. The fuel consumption reading was at 95%, and it was surprisingly accurate.

Now, after the pump adjustment, I had to go back to 100%. I'm currently in the process of 'finding out' how accurate it is.

'Just where is the connection between pump settings and MFA?'