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Normally the fuel pump relay is separate from the AC. You can pull and switch positions of identical relays, depending on what you are trying to accomplish. If the fuel pump relay is working, and the rest of that circuit is okay, you will hear the fuel pump come on with a little whirring noise when the key is turned on.

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17y ago
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Q: Changed the fuel pump relay do you have to change the ac also on a 1988 s10 pickup 4.3?
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