1 thing I forgot to mention> IF the engine shuts off w/ the key switch, it means it has an electric sh-off solenoid on it.. some are external, meaning they engage the throttle or sh-off lever OUTSIDE the engine.. and some are internal, meaning they attach to the engine block & engage the engines internal control rack to shut the fuel off.. IF ITS INTERNAL.. you must remove the solenoid first, before removing the pump.. good luck & let us know how your making out..