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.
Fuel Injection System - Diesel: Description
Diesel fuel injection systems consist of the fuel tank, fuel filter, distributor-type injection pump, glow plugs, throttling pintle injection nozzles, and a centrifugal governor. See Figure .
A vane-type fuel pump, built into injection pump, supplies fuel from tank to fuel filter and then to injection pump. Injection pump supplies fuel to nozzles under high pressure, according to firing order (1-3-4-2 on 4 cylinder engines and 1-2-4-5-3 on 5 cylinder engines). Excess fuel is returned to fuel tank by return lines.
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.