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.
1987 Mercedes Benz 300EFACTORY OEM SERVICE PROCEDURE
Fuel Distributor Delivery Volume
- Unplug oxygen sensor lead under right front floor mat. Disconnect small fuel return line running between fuel distributor and diaphragm pressure regulator at fuel distributor end. Plug line. Connect hose to open fuel distributor port.
- Place other end of hose in measuring glass or beaker. Remove fuel pump relay. Bridge sockets No. 7 and 8 with jumper wire to run fuel pump for one minute. Fuel delivery volume should be 4.4-5.0 ozs. (.13-.15L) per minute with 11.5 volts to fuel pump. If delivery volume is too low, replace either fuel distributor or differential pressure regulator.
Factory Service Tools
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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.