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well if you now your getting good pressure at least 60psi with hose pinched, and you get at least 1 quart of flow in 30 seconds then you know the pump is good 99.99%.
If you put your volt meter at the terminal where the wiring goes to the pump and you check your voltage while you have someone move around all the wiring from battery to the trunk then you can eliminate bad wiring. You could also pull out the pump and check to see if anything is in the tank such as dirt, sugar, and whatever else could clog up the pump. Usually when the pump isn't sucking anything in it will be louder. Pull the pump assembly out and inspect the wiring there also. If you haven't replaced the fuel filter do it now, its nothing hard to do even a little kid could do it, you don't need to wait till problems start happening, replace your filter periodically.
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