Fuel pump

The eccentric on the cam fits one way, if you pooch it, it will still be on but just wont be located correctly. Also the pump fits in the hole but wont seat properly until its bolted down so if it slides in and seats to the cover, something is wrong. The 'arm' has to go under the eccentric so the pump will be cocked down (lower tab not touching) and when you push the pump onto the cover, you'll feel spring resistance.