If in Freezing area's you need to run antifreeze (RV) though pump. If in area's that will not freeze there also is a pump lub that you can buy from Lowe's or Home Depot that you just screw onto the inlet on your pump (end where you hook your garden hose on) and press the button for couple seconds and the oil mix will start coming out the other end.
That is the best way for times of year when you know it won't freeze. Other than that the RV antifreeze can be put in with a short piece of hose. Attach hose and pour into hose until full then either wait or pull cord a few times (not starting engine = switch off).
Mine has lasted since mid 90's and never a problem (also always buy one with a Honda engine.
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