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.
Regulated Fuel Pressure
There are 8 fuel injectors, one per cylinder which the ECM operates sequentially. On Discovery Series I, regulated fuel pressure should be 35-37 psi (2.5-2.6 kg/cm2 ) and varies depending on amount of intake manifold vacuum acting on fuel pressure regulator. On Discovery Series II and Range Rover, all 8 injectors are fed from a common fuel rail as part of a returnless fuel system. Fuel pressure is maintained at a approximately 50-52 psi (3.5-3.6 kg/cm2 ) by a regulator that is integral with the fuel pump.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.