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Q: Fuel Pump on 1994 Chevrolet Suburban 1500

Is the fuel pump located in the tank & if so do you need to drop the tank to replace it?
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Labor time according to the labor guide is 2 to 3 hours depending on whether there is a tank shield or not 2WD or 4WD. The gas tank needs to be drained, the shield and gas tank straps removed. carefully disconnect the filler neck and evaporative emission control hoses, fuel out and fuel return hoses. Some hoses may require a "disconnect tool" any parts store has them they are made by a company called Lisle and are about $15 for a little set of tools. It consists of a sleeve that slips over the fuel line ,pushes into the fuel line connector and disengages a retaining clip. Be careful fitting the rubber O ring that seals the fuel gauge/fuel sender unit or you may end up with a evap code or fuel leak.
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