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.
Volume control valve and high pressure pump: Notes
The fuel is delivered to the high pressure pump via the inlet with delivery pressure generated by the fuel pump. The fuel is then directed into the fuel chamber of the pump element via the quantity control valve. In this pump element, the fuel is pressurized by a piston and delivered to the high-pressure connection via the high-pressure non-return valve. The high pressure pump is screwed to the cylinder head and is driven by the camshaft via a triple cam.
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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.