I have a 1990 Evinrude 40 hp outboard tiller with problems. Symptoms started with it occasionally stopping while trolling. Would have to give it more throttle to keep it running at low speeds. Then the symptoms progressed to bogging down at wide open throttle on some trips. Now I can’t run at anything above trolling speed without it bogging down. It has a VRO system that has been disconnected. I replaced the fuel hose, put in new spark plugs, changed fuel filter, rebuilt the carbs (they looked clean), and started with new gas. The motor has run very well for the 3 years I have owned it until this started. I don’t want to replace the VRO unit as it is an expensive part ($500). I see that some people have removed the VRO and just added a fuel pump for much less cost. Do you think this is a fuel pump issue and how could I diagnose it? Could it be something else? Any advice would be greatly appreciated.