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.
1993 Mercedes Benz 300DFACTORY OEM SERVICE PROCEDURE
Fuel Pump
NOTE:
Fuel pump performance is a measurement of fuel pressure and volume availability, not regulated fuel pressure.
FUEL PUMP PERFORMANCE
| Application | Pressure psi (bar) | Min. Vol. In 30 Sec. Pts. (L) |
|---|---|---|
| Diesel Engine | 4.4 (0.3) | .32 (.15) |
| Gasoline Engine | 77-80 (5.3-5.5) | 2.1 (1.0) |
REGULATED FUEL PRESSURE
| Application | psi (bar) | ||
|---|---|---|---|
| 2.8L & 3.2L | (1) | ||
|
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DIESEL INJECTION PUMP TIMING
| Application | Degrees ATDC |
|---|---|
| 5-Cylinder & 6-Cylinder | 14-16 |
DIESEL INJECTOR NOZZLE PRESSURE
| Application | psi (bar) | |
|---|---|---|
| Injector Opening Pressure | ||
| New Injector | 1958- 2103 (135-145) | |
| Used Injector | 1740 (120) | |
Factory Service Tools
Use the Manual With the Right Hardware
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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.