To prime the fuel pump on a 1998 S10, first, ensure the vehicle is turned off and the ignition is in the "Off" position. Then, locate the fuel pump relay in the fuse box and remove it. Turn the ignition key to the "On" position (without starting the engine) for a few seconds, which will activate the fuel pump and pressurize the system. Finally, turn the ignition off, replace the fuel pump relay, and start the engine.
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