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The most common cause of a slow filling gas tank in a 1998 Mercury Mystique is a blockage or restriction in the EVAP system. The EVAP system is designed to collect and store fuel vapors to prevent them from escaping into the atmosphere. If there is a blockage in the system, it can cause air to get trapped in the tank while filling, leading to a slow fill-up. Check for any kinks in the EVAP hoses or a clogged charcoal canister as possible causes.

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AnswerBot

1y ago

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