Mechanics

Fuel Pump Test

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Step by step instructions on how to check an automotive fuel pump and pressure regulator, this article pertains to most fuel injected vehicles.

Difficulty Scale: 4 of 10

Begin with the vehicle on flat ground, in park with the emergency brake on, engine "OFF". (No smoking or open flame.)

Step 1 - Locate the vacuum line which is attached to the fuel pressure regulator and remove it, this line should be free of fuel, if fuel is observed the regulator has failed. (Note: Not all vehicles are designed with a pressure regulator.)


Inspecting Vacuum Feed Line

Step 2 - Once the inspection for the fuel pressure regulator is complete reinstall the vacuum line.


Reinstalling Fuel Line

Step 3 - Locate and remove the protective cap which will allow the fuel pressure gauge hose to be attached.


Fuel Pressure Test Port

Step 4 - Next, remove the fuel pressure test gauge from its packaging. The gauge shown is a professional gauge kit, but any attachable fuel pressure gauge will work.


Fuel Pressure Gauge

Step 5 - After fitting the gauge with the appropriate adapter attach the gauge line to the fuel test port. If no test port is provided, a fuel filter adapter is needed, this adapter is connected to, or takes the place of the fuel filter.


Connect Fuel Pressure Gauge

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AUTHOR


Written by
Co-Founder and CEO of 2CarPros.com
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


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Article first published (Updated 2014-08-09)