HeyI need to get in there and do mine. Any performance issues before you changed it?
I agree that the fat "o" ring between tank and unit should be replaced. I picked one up at the dealer in Vallejo.Not bad for 75,000k Smokey. IMO, I would not wait that long to change this in your ZG. Regarding the life of the oem pump, I have heard it should be good to over a hundred thousand. This is based on several different variables: Type of fuel used, storage of bike, fuel additives, environmental exposure..etc. Regarding the gasket on the bottom of the tank, I would replace with a new one anytime you change your fuel filter. Rubber degrades over time.