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AV-SCANNER / Service function guides / Fuel and emissions
This guide walks a working technician through the complete fuel pressure testing procedure, from understanding how the supply system delivers fuel to the injectors to interpreting the final gauge readings under load and during a leak-down check. It is written for mechanics and experienced DIY owners who already own a quality fuel pressure gauge set and understand basic electrical testing. By the end, the reader will be able to safely connect a gauge, measure static and running pressure, perform a volume and leak-down test, and diagnose whether a low or erratic reading points to the pump, filter, regulator, or wiring.
Guidance is general and covers many makes. Exact procedures and values vary by model, so confirm them in the factory service information for your vehicle.
Download all 12 sections as a branded PDF to use in the workshop.
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