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Where is the fuel tank pressure sensor on a 1999 Chevy Express van?

The fuel tank pressure sensor on a 1999 Chevy Express van isn't a single, easily identifiable component like a mass airflow sensor. Instead, the fuel pressure is typically monitored indirectly, as part of the overall fuel system. There isn't a dedicated "fuel tank pressure sensor" in the same way some vehicles have.

Instead of a dedicated sensor, pressure is usually determined by these methods:

* Fuel pressure regulator: The fuel pressure regulator itself maintains fuel rail pressure. While not directly a "sensor," its function and the pressure it maintains are indirectly monitored by the PCM (Powertrain Control Module). Any issues here often lead to diagnostic trouble codes (DTCs) related to fuel system performance. This regulator is typically on the fuel rail itself.

* Indirect pressure sensing via other sensors: The PCM infers fuel pressure by monitoring fuel pump operation (via fuel pump current draw), oxygen sensor readings (to gauge fuel delivery efficiency), and engine performance parameters.

To find the potential source of fuel pressure issues, you'll need to:

1. Check for diagnostic trouble codes (DTCs): Use an OBD-II scanner to read codes from the PCM. These codes will point you to a specific area of the fuel system, possibly including a faulty fuel pump, regulator, or other issues affecting pressure.

2. Consult a repair manual: A factory service manual for your specific 1999 Chevy Express van (including the engine size - 4.3L, 5.0L, 5.7L, etc.) will show the fuel system schematic and the location of components like the fuel pump, fuel pressure regulator and other related parts.

In short, you won't find a stand-alone "fuel tank pressure sensor." Troubleshooting fuel pressure problems requires a more systemic approach focusing on the broader fuel delivery system. A mechanic or a detailed repair manual will be vital in diagnosing the root cause.

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