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How do you know if a fuel pump relay on a 1993 mustang is bad?
Wiki User
∙ 12y ago
You will know by checking to see if you have voltage on both the low side and the high side. This relay is just a device that controlled by a low amp circut that closes and opens the circut for the high amp circut which would be the fuel pump feed. You can change the relay from the horn relay or other similar relay and swap them to see if you problem is gone.
Wiki User
∙ 12y ago
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