someitmes it means you left the gas cap lid loose last time you filled the tank. the vacuum system trys to pull a small vacuum on the tank to keep the fumes from exiting into the atmosphere. its just a polution control system. disconnect the battery cable for 5 minutes, reinstall, and see if it happens again.--- see if the gas cap lid is good seal.
2002 SuperCrew 4 x 4 5.4 XLT -110K miles -NEW
2010 EDGE FWD - V6 ----------34,000 miles
2002 Explorer 4 x 4 4.0 XLT --- 162,000 miles
2001 SuperCrew 4 x 4 5.4 XLT -235K miles -GONE
I redid the gas cap and reset the check engine light with my code reader and so far the cel has stayed off thru about 50 miles of city/highway mix driving. I was worried because i know my fuel lines are starting to pit from rust but not sure if it would cause a vacuum leak. i do know that whenever i go to fill up the tank when i loosen the gas cap it makes a loud shhhhhhhhhhhhhhhhhhh sound from the pressure build up and it does this every time. is this good or bad?
2000 Ford Mustang GT Special Edition
1997 Ford Explorer XLT 5.0 AWD
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