I have a 1990 31ft express with...

[Capt__Stan]

I  have a 1990 31ft express with a Navman GPS system. Does anyone know if there is a direct replacement for this unit as  don't want to loose my fuel scans or is there someone that can repair this unit, Thank you

[gtstang462002]

Not familiar with Navman systems. When you say fuel scans are you referring to flow-scan fuel meters to tell you fuel burn?

[Capt__Stan]

Yes Flow scan fuel meters

[gtstang462002]

Flo-scans have 2 output options. One is proprietary to them and the other is output via NMEA 2000 which can be interpreted by any modern chartplotter. I believe that they have a converter to take their proprietary singal and put it onto a NMEA2K backbone.

[Captain_Ben]

A solution for one problem is to spray carburator cleaner into the fuel line going to the sensor. When this line gets clogged it will not read correctly.