Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Primary Fuel Pump Module
The primary fuel pump module is mounted on the top of the fuel tank and contains the following components:
- Mounting flange
- Electric fuel pump
- Venturi jet pump (AWD)
- Fuel pump reservoir
- Inlet strainer
- Fuel pressure regulator
- Fuel level sending unit
- Fuel filter
The electric fuel pump (2) is a positive displacement, immersible pump with a permanent magnet electric motor capable of creating 860 kPa (125 psi) of operating pressure. The fuel pressure regulator limits fuel pressure to 400 kPa (58 psi).
If equipped with All Wheel Drive (AWD), the primary fuel pump module will also contain a venturi jet pump. The primary fuel pump module is joined to the secondary fuel pump module (AWD) by an internal nylon fuel transfer line equipped with quick-connect fittings (4). Fuel is constantly being siphoned from the secondary side of the fuel tank to the primary side of the fuel tank whenever the fuel pump is operating. This is accomplished within the primary fuel pump module by diverting fuel from the electric fuel pump through the venturi jet pump creating a vacuum that pulls fuel from the secondary fuel pump module through the fuel transfer line and into the primary fuel module reservoir. When the secondary side of the fuel tank is empty, the venturi jet pump continues to fill the primary fuel pump reservoir with fuel from the primary side of the fuel tank.
The fuel level sending unit (3) is the only serviceable component of the primary fuel pump module. If the electric fuel pump, fuel pressure regulator or fuel filter requires service, the primary fuel pump module must be replaced as an assembly.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.