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Where is the fuel pump switch on a 1990 Ford Aerostar van XLT?

The 1990 Ford Aerostar doesn't have a fuel pump switch in the traditional sense like some older cars. The fuel pump is controlled by the computer (Powertrain Control Module or PCM) and is activated by the ignition system. There's no separate on/off switch accessible to the driver. If the fuel pump isn't working, the problem lies within the electrical system, the fuel pump itself, or the PCM.