Section through a type PFR(roller tappet) single-cylinder injection pump 1, delivery valve holder; 2, delivery valve; 3, pump barrel; 4, pump plunger; 5, fuel control…
Category: Fuel Systems
Section through a model PF 10 pump: delivery valve; 2, bleeder screw; 3, pump barrel; 4, pump plunger; 5, control rod; 6, control sleeve; 7,…
Section through a type PFE1Q compact individual jerk pump used on small-bore displacement diesel engines) , delivery valve; 2, delivery valve holder; 3, housing; 4,…
Bosch PF Injection Pumps Various Models
Most engines incorporate three stages of filtration—a screen at the tank and paper-element primary and secondary filters. Filters are rated by the size of particle…
Loss of pressure is the definitive symptom of pump failure, although it would be helpful if manufacturers provided output volume specifications. Before condemning the pump,…
A fuel supply, feed, transfer, or lift (the terms are interchangeable) pump supplies low-pressure fuel to the suction side of the injector pump or unit…
Thus far, we have discussed three types of mechanical fuel systems: air blast, early common-rail, and jerk pump. The last of these systems, and in…
The leather diaphragm should hold 500 mm/H2O of vacuum with a leak-down rate of no more than 2 mm/sec. It should be flexible enough to…
This unit, shown in cross-section in Fig. 5-31, uses a flap, or butterfly, valve (4) as a variable venturi. A tube bleeds vacuum from the…