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Under the hood, driver side, next to master cylinder power booster, mounted on the fire wall. there are two, I'm not sure if they are both the same, or if only one is the pump relay. they are side by side, about 1.5 in x 1.5 in x 3 in w/ maybe 4 wires coming out of the bottom of them.

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Q: Where is the fuel pump relay on a 1991 Chevy blazer S10?
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