I just installed my new ARINC device and ran all the wires as per diagrams to fully integrate with the GNS430W. The only thing that is not working is Fuel data to the GNS430W. I'm getting traffic, flight plans, gps, and seeing the correct HSI displays. The GNS430 reports no data received on SER1. On the AFS, there's no error message, and it seems to pass the SER1 test in the admin page, with packets rcvd and sent. I double-checked the pins and wires and it looks right.

The settings on the AFS are per manual: AVTN and ARNAV.
The SER1 in on the Garmin is as per manual: ARNAV/eifuel.

Any ideas on what to look at?
What does the SER1 test really verify?