Function

To filter and continuously supply cool fuel to the distributor type injection pump and remove any possible existing air from the injection system.

How it works

From the tank the fuel is sent to an especially fine pored filter. This protects the parts of the fuel injection system which have a very low tolerance (less than 1/1000mm) against damage. From there it flows to the vane-type pump in front, on the oil pump drive shaft. The filter is installed, in contrast to the fuel supply of the in-line injection pump, on the intake side. The pressure control valve, directly behind it provides, together with the throttle governer on top, on the pump lid, for a variable internal pressure, which amounts to, depending on the RPMs and the strain, between 1- and approx. 7 bar. Inside, the fuel-flow is divided. Although a small amount reaches the high-pressure section, most of the fuel is pumped through the over-flow throttle in the out screw, back into the tank. Thus, a cool fuel-flow can follow, because in the pump, depending on working conditions, temperatures can be reached of up to 80°C.

Important

Both of the two screws, with and without throttle, on the upper side of the VE pump, are inter-changeable. Then, however, not enough fuel is taken in, and no internal pump pressure develops. 10/09