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jimgilliam10 · 04-11-2019, 01:43 PM

I have a 2004 alfa motorhome that is not creating air pressure for the 2 gauges on the dash [front and rear air] and also no air is being supplied for the suspension air bags. The Alfa is equipped with the 3126 cat engine.

96 Wideglide · 04-11-2019, 01:53 PM

Can you hear air leaking? Maybe from your air dryer purge valve, or tank drains.

FL420 · 04-11-2019, 02:12 PM

If it's not "creating" air pressure then it's a good idea to check the compressor. Is any air pressure building with the engine running?

CountryB · 04-11-2019, 02:32 PM

The engine driven air compressors have a "governor" to control air pressure. It may have gone bad or could be stuck. if nothing obvious is found check the governor by removing the small line (unloader) line going to air compressor if governor is remote mounted. If air is coming out of the small line (and there is less than 120 psi air pressure in tank) then governor is bad or sticking.
Another possibility is that the unloader valve in the Air Compressor head is sticking open so pressure can not be built.