A trick to remove the fuel from the Secondary Housing on the engine. After you open the 6mm drain on the HFCM, go under the hood and open the Secondary Filter lid... this will allow the fuel to drain from the housing into the bucket you already have in position. This is what I have been doing. After you replace all the lids and the drain. Cycle the key from off to run, at least 3 times, and listen for the pump to stop running before the next cycle. After the 3rd cycle, start the engine and check for leaks. Should start up just like normal. The system has an automatic purge feature, so the air will leave on its own and start like normal.