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roybelding, ASE Certified Technician
Category: Mercury
Satisfied Customers: 5300
Experience:  35 years of retail operations on all vehicles
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I just bought this mystique and it was running rough it died

Customer Question

i just bought this mystique and it was running rough it died removed the gas cap and all kinds of air came out of the tank the car started back up and ran smooth for about 15 minutes and died again removed cap again started back up and ran smooth what could the problem be
Submitted: 7 months ago.
Category: Mercury
Expert:  roybelding replied 7 months ago.

good evening my name is ***** ***** i will assist

the reason for the pressure build up is a bad fuel cap. the valve is bad.

replace it and see if it resolves the issue. it may be forcing fuel into the evap system and flooding the engine.

leave the cap off and see if the engine continues to run properly.


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