Monocylinder injection pumps are without their own camshaft, but they are driven normally by the engine camshaft.

The plunger lift of the pump is always constant and delivery per stroke is controlled by timing of a metering helix on the plunger.

The movement is transmitted from the cam to the plunger via a roller or flat tappet. The pumps are provided with a flange for mounting on the engine. The feed pump and the governor are separately mounted on the engine.

For multicylinder engines it is necessary to provide one pump per cylinder. One single governor operates by a single bar the control rods of each pump.

The monocylinder fuel injection pumps manufactured at MEFIN Sinaia are of Q, K, A, B, Z, C and CQ size. They are suitable for high speed, low power engines as well as for railway or marine applications.


Short path from to engine cylinder for short high-pressure tubing and minimum dead volume
Suitable for direct and indirect injection
Mechanical metering
Sizes and configurations available for a wide variety of applications
Use of high-volume in-line pump components (smaller models)
Vertical or horizontal high-pressure outlet
Cast-iron or aluminum housing
Guide sleeve for roller tappet, or integrated roller tappet
Exceptionally high-quality components, to assure long service life
Monobloc element for high-pressure applications (reduced emissions)
Large pump models for operation on heavy-viscosity fuel
Technical parameters
Pump size
  Q K A B Z C CQ
Plunger max. stroke
mm 7 7 8 10 12 22 20
Max. power per engine cylinder
kW 9 17 20 21 204 272 340
Max. peak injection pressure
bar 500 650 700 550 900 1000 1000
Pplunger diameter
mm 5 5 .. 9 5..10 8 16 17 .. 20 16........19
Rack stroke
mm 18.5 19 21 25 29 34 34
Max. pump speed
rpm 2000 2000 2000 1500 1000 400 550
Max. output
mm3 / cycle 30 52 100 130 850 2190 1388
Diesel fuel
Operating temperature
From -200C to + 700C