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 Pump
The Bosch VE4 mechanical injection pump contains a low pressure vane-type transfer pump and a high pressure distributor-type injection pump.
The transfer pump output pressure (injection pump housing pressure) averages 50-100 psi (3.5-7.0 kg/cm2 ) depending upon engine speed. The plunger injection pump boosts fuel pressure to about 2000 psi (140 kg/cm2 ). Pump assembly is also equipped with an electric fuel shutoff solenoid.
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.