How are fuel pressure issues diagnosed?
When a fuel pressure test is conducted, the technician will come to an understanding of where the fuel pressure drops based on finding the last place fuel pressure exists. Once the fuel pressure drop is located and pinpointed across one component, the technician will need to identify if that component is serviceable, if it is properly actuated, and if it must be cleaned, repaired, or replaced.
How are Fuel Pressure Tests done?
Replacing fuel system components responsible for loss of pressure will require depressurization of the fuel system, catching remaining fuel from the fuel lines, and using specialty fuel line disconnect tools in order to remove components from the fuel delivery system. In some cases, the fuel tank or rear seat may need to be removed, and any fuel system components between the fuel system and engine may need to be removed and replaced. When electrical components are disconnected, it is important that the battery is disconnected, so settings in the vehicle may be lost after the repair.
RepairPal Recommendations for Fuel Pressure Tests
We recommend conducting a fuel system test after checking the fuses and relays, but before replacing components without diagnosis. This will prevent many good parts from being changed, decrease cost, and prevent frustration.
What to look out for when dealing with Fuel Pressure Issues
Fuel systems can lose pressure for a variety of reasons, but if the odor of fuel is evident around the vehicle or under the hood, the likely issue is a fuel leak. Vehicles with fuel leaks should never be driven, as this poses a distinct risk of fires, especially if the leak is in the engine bay.
Can I perform my own Fuel Pressure Test?
Fuel system pressure testing is something that a well experienced DIYer can do at home. The required tooling is normally available to rent or purchase inexpensively, and the portion of the fuel system which is pressurized is linear. This means that the fuel moves from point 'a' to point 'b' with a few stops in between. As long as safe practices are followed when working with fuel and the fuel system and the fuel system is thoroughly understood, this can be accomplished in an afternoon to save on diagnostic costs.
