Disconnect spring clamp from purge valve and pull purge valve hose from valve. – store hose out of the way. 14. Place rags underneath bolt attaching fuel line to fuel rail assembly under intake mani , disconnect bolt using a 17mm open wrench then disconnect bolt under fuel pump using 17mm wrench. Dec 02, 2009 · My 2004 lincoln aviator has been diagnosed with an intake mainfold tuning valve issue - which is causing intermittent, brief hesitations at acceleration / speeds of 40 - 60mph. Is there any aftermarket product I can spray in the mainfold / put in the tank to ungum the valve? The dealer wants 1100 to replace.