If your problem is pressure when you release the gas cap it could be one of several problems. The first two are easy. A fuel pressure sensor on top of the charcoal canister under the computer and air filter on thew drivers side engine compartment. The next is the purge valve located on the front top of the engine under the cover. A hard line runs from the purge valve to the sensor on the charcoal canister.
The third is the most difficult. It is the fuel tank pressure sensor on top of the fuel tank. I believe you will need to drop or at least lower the fuel tank. Not an easy task. I have heard some models have an access plate in the trunk under the mat but mine did not. All are under $50.00 ea. and readily available at your local parts store or online. It is very important you get this fixed asap as it will build enough pressure to find a weak spot in the tank and rupture it. That happened to me.
While it is not ideal, you can temporarily loosen the gas cap to where it is just sitting in the filler tube when driving until you can fix it. Then have your check engine light reset.
SOURCE: Re: Location of the radiator drain plug on a 1998 Lesabre
its in the lower right or left hand corner of radiator.
refer to this links diagram for more help.
http://www.autozone.com/addVehicleId,2380201/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c152800b1cd7
SOURCE: 2004 Buick Lesabre speedometer not working
Yes it's on the right side othe transmission just above the passenger side cv axle. You most likley need to send the cluster off and have it checked. Model Electronics in NY.
SOURCE: 2001 buick lesabre gas cap loose warning light
GM vehicles are fmaous for this warning. I had the same problem in my GM vehicle and had to replace the EVAP vent solenoid. Are you getting a DTC yet or just the tighten gas cap message? INspect the fuel cap to make sure it is not damaged and is installed properly. If it's damaged replace it. If all is good on the cap just wait for the DTC to show up but most likely you'll need to replace that solenoid.
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SOURCE: how long does it take check engine light to go off
you can take of the ground of the battery of the car for 30 minutes and the computer will reset. if you drive around without reseting the computer might figure it out after 30 miles.
SOURCE: where is pcv valve 1998 buick lesabre
Remove the sight shield from the fuel rail. (it's the large plastic shield that dresses up the engine) As you stand in front of the car the alternator is located on rear left side. In front of it is an electrical connector to the MAP sensor. Remove it. Press the PCV valve cover down and rotate it 1/4 turn counterclockwise. It is actully on the intake manifold. Lift the cover, the upper O-ring and the spring from the housing. Remove the pcv valve and the lower O-ring from the intake manifold.
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