Focus ST Low Pressure Fuel Line UpgradeNEW! If you've ever had to deal with removing the factory low pressure fuel line on the Focus ST, you'll quickly realize why we decided to make a better line. The factory line can be a nightmare to remove, due to the type of quick connect fittings used. Either specialty pliers or low profile fuel disconnect tools are needed to remove this line. Even then, on older higher mileage STs, the factory quick connector plastics can deteriorate and crumble,