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Search Auto Parts Search Gas Cap Sign up here!   Email This Post Auto Repair Home>> CarJunky>> Open Posting Guest Anonymous Poster snoe2006@yahoo.com Oct 16, 2007, 10:18 AM Post #1 of 5 (3205 views) Gas Cap Sign In I have a 1997 Mercury Grand Marquis. When I open the gas cap there is no hissing or pressure buildup. Is this good or bad. Thank you! way2old Veteran / Moderator Oct 16, 2007, 10:35 AM Post #2 of 5 (3202 views) Re: Gas Cap Sign In Really that is a good thing. It means all the vents and regulating devices are working properly. It also probably mrans the outside temperature is lowered and is not causing as much pressure in the tank. Being way2old is why I need help from younger minds Guest Anonymous Poster snoe2006@yahoo.com Oct 16, 2007, 11:05 AM Post #3 of 5 (3199 views) Re: Gas Cap Sign In I thank you for responding. The thing is I have made a lot of to the car, but all of a sudden I'm getting lousy gas mileage, and I thought it may be due to the evap system. Any thoughts on that? way2old Veteran / Moderator Oct 16, 2007, 12:46 PM Post #4 of 5 (3194 views) Re: Gas Cap Sign In The evap system should not affect your fuel mileage that much. If one of the solenoids were malfunctioning, it should only pull vapors out of the tank, not liquid fuel. How many miles/km on the car and when was last tune up? Being way2old is why I need help from younger minds Guest Anonymous Poster snoe2006@yahoo.com Oct 16, 2007, 12:58 PM Post #5 of 5 (3193 views) Re: Gas Cap Sign In This car has 144,000 plus miles. I changed plugs, plug wires, new tires, new coils, fairly new egr, trans fluid change, new idle air valve, replaced coolant temp sensor, all recently, but no codes show on reader. Can't figure out what's wrong- maybe oxygen sensor next? Any thoughts. Thanks   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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