Question about 1998 Chrysler Concorde

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Fuel problems with '98 Chrysler Concorde

My 1998 Chrysler Concorde 3.2 liter with 170K miles is having problems starting, if parked pointing downhill, then no problem. But level ground or up hill won't start. Seems like it is a vacume problem, but not sure how to fix. If remove gas cap, then will start even on flat ground. If stalls while running, then remove fuel cap, wait about 5 minutes and will start.

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Easiest diagnosis and fix is to replace the gas cap. Too many people do not recognize the modern gas caps are not like the old 70's where you had carbeurated engines. With the new systems a proper vacuum (you are spot on) is required. Since you can correct this problem by manipulating the gas cap it doesnt sound like anything with a vacuum hose, etc in the engine compartment. Sounds like the gas cap has failed and is not venting/passing air as it should. A valve in the gas cap is set at a certain pressure rating for your vehicle and all vehicles to vent gas vapors and allow air into the tank.. One to prevent explosion due to vapor build up and two to allow a certain amount of air into the tank. This valve is defective or broken on your cap. A new cap is about 11 dollars at the local parts store.

Posted on Jun 07, 2010


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