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There is a yes and no to the ethanol thing. Yes it is harder on rubber.It tends to dry it out and promotes faster rubber rot. The catch here is that pretty much all fuel has alcohol in it so it is what it is. The no part is that most quality replacement pumps are made with alcohol resistant diaphrams and reed valves (or so we are told). I still deal with a lot of cars with mechanical pumps and do not see a higher failure rate compared to older times. My personal thoughts are that you need to keep the rubber in motion by simply running it. Think of tires that sit and dry rot in a short time. Tires that are driven last many more years. Replace the pump and keep driving the bird and it will be fine.
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