Aloha, I own a 2003 Conti Classica that is a special propane gas powered make. It is 2 group machine and both group heads do not have consistent pressure; one having much less pressure than the other. It has barely been used and sat crated for 8 years. Any advice on what the issue could be? It is set up in a mobile coffee truck.
You have to specify whether this machine has conventional, or lever groups. If it has conventional groups, one group could be partially plugged with scale. If it has lever groups, the group springs may be rusted (if they are mild steel) if one was favoured over the other because of proximity to the grinder the spring(s) on that group may be more rusted than the other.
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