113.ME fuel pump timing

Checking Fuel Pump Timing

The primary method of checking fuel pump timing would be using the manufacturer’s instructions of setting the fuel pump with the engine stopped. For the Bosch type fuel pumps, a small window is present at the base of the fuel pump. Within this window an engraved line can be seen on the spring holder of the fuel pump. When the cam follower is displaced by the cam, it pushes the spring holder up. When the engraved line coincides with the line on the fuel pump body, then the fuel pump plunger is at the position where it is just covering the spill ports.

Hence at this moment the fuel pump is starting to pressurize the trapped fuel volume, and hence fuel delivery will commence. Thus the engine is rotated to the point where the two lines coincide, and this indicates the commencement of fuel delivery. The actual crank angle would be read off the flywheel.

Adjustment