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I just went through this on my 1987 s10 blazer. If it's like my pump, there is a connector with two plugs at the tank plus a ground wire. One wire goes to put twelve volts on the pump, the other sends info to the gauge on fuel level. Consult a manual to determine which wire it is, then put twelve volts to the fuel pump power. If it doesn't make a whirring noise, it's probably bad or you have a bad ground. I just started swapping out parts, the fuel pump relay was about 6 bucks and really easy to replace. Try that first. If that's not it, try replacing the oil pressure switch ($5-$35 depending on your car). Just hope that your pump isn't bad, because if it's inside the tank, it's a real pain to drain the tank and drop it. If you end up dropping the tank, just replace everything back there. When compared to a $70 pump, the hoses and wires are cheap so replace them preventitively especially if your car is getting old. Hope this helps!

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