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Q:

fuel pump relay on 1990 Ford Escort

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
will fuel pump relay switch make noise
when bad and will car run if it is bad.
car idles rough and dies switch makes noise when check engine light comes on
(1) Answer
Count the Flashest when your check engine light comes on that is your trouble code this will make it easier to find the problem.