my 99 Marquis runs rough only when the gas tank is low. What's up?

Asked by MartyMichael Dec 19, 2013 at 06:39 PM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: General

The less gas in the tank, the harder it is to start and also runs rough. More like it "blinks" or "skips" rather than shaking. Could it be water in the tank? If not, then what. The car has f20k on it, and otherwise is in great shape.

1 Answer
200,965

dandyoun answered 10 years ago

Yes it could be. Could also be an issue with the pick up tube in the tank. If it has a pin hole in it that gets exposed to air when fuel level is low it will spit and sputter. I would add some sea foam to a full tank of quality fuel. If its a water/moisture issue in the tank this should solve it.

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