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Guest
Anonymous Poster
snoe2006@yahoo.com

Oct 16, 2007, 10:18 AM

Post #1 of 5 (1666 views)
post icon 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
way2old profile image

Oct 16, 2007, 10:35 AM

Post #2 of 5 (1663 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 (1660 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
way2old profile image

Oct 16, 2007, 12:46 PM

Post #4 of 5 (1655 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 (1654 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






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