Checking Fuel Delivery Rate For Control Pressure Circuit

CHECKING FUEL DELIVERY RATE FOR CONTROL PRESSURE CIRCUIT

Requirements: Fuel pumps in correct operational condition.

Checking




1. Connect and bleed pressure gauge.




2. Set switching valve to position 8.




3. Unscrew hose from Special Tool P 878 on warm-up regulator and hold end in a measuring glass with volume of at least 500 cc.

4. Turn on ignition.




5. Move switching valve to position 2 and let electric fuel pumps run exactly 1 minute by pulling off two-pin plug on mixture control unit. Stop by switching valve to position 3 and measure delivery rate.
Test value: 160 to 240 cc/minute.

If measured value is outside of tolerances, the cause will be in the fuel distributor. Replace fuel distributor.