Diesel Engine Troubleshooting

Diesel Engine Bosch VE Fuel Pump

with 4 comments

Nearly 50 million VE pumps have been produced since introduction in 1975 with applications ranging from fishing boats to luxury automobiles. Figure 5-9 sketches a basic installation, with filter, gravity-type water separator (sedimentor), fuel lines from the pump and injectors, and a solenoid-operated fuel shutoff (magnet) valve. Normally the fuel shutoff requires battery power to open; for marine applications the valve must be energized to close. This permits the engine to continue to run should the vessel lose electrical power.

small engine fuel distributor Diesel Engine Bosch VE Fuel Pump

The VE turns at half engine speed and is geared to a mechanical (shown in Fig. 5-10) or electronic governor. The rear half of the pump houses the vane-type transfer pump and regulator that supplies the high-pressure section with fuel at pressures ranging from 40 psi to 175 psi at full throttle. Vane-pump pressure also controls the hydraulic timer that advances injection with increased engine speeds.

bosch VE injection pump Diesel Engine Bosch VE Fuel Pump

A tongue-and-groove joint mates the rear half of the two-piece drive shaft with the forward, or plunger, half. This joint, which can be seen clearly in Fig. 5-11, permits the forward half of the shaft to move fore and aft as it rotates under the impetus of the face cam. The cam reacts against the housing through roller bearings, oriented as shown in Fig. 5-12.

bosch VE sectional Diesel Engine Bosch VE Fuel Pump

A control sleeve regulates the effective stroke of the plunger, which discharges through delivery valves on the distributor head.

VE plunger Diesel Engine Bosch VE Fuel Pump

Written by Ed

February 11th, 2011 at 1:09 am

Posted in Fuel Systems

Tagged with ,

4 Responses to 'Diesel Engine Bosch VE Fuel Pump'

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  1. Hi, would you happen up know why a ticking noise is coming from the pump and tractor is harder to start, needs pumping on excelerator?


    7 Apr 13 at 5:27 am

  2. Since the rotary Diesel fuel pump (like Bosch) are lubricated by the diesel fuel itself, I am concerned that to use a low sulfur diesel such as S10, which feels much more like gas with very little viscosity, could damage the pump. Some truck mechanics say it might! Any ideas?


    2 Dec 13 at 6:51 pm

  3. no i think the material with which the rollers and the cam plate are made is tough enough


    10 Oct 16 at 5:23 pm

  4. Have a 580M Case Backhoe with a Bosch VE pump.

    When I started it recently, it didn’t want to run unless I gave it a lot of throttle.

    I let it sit overnight, and now when I start it, it immediately revs to high rpm – redline, so I shut it off right away.

    What could cause this, and can if be fixed w/o pulling the pump?

    Thank you,


    15 Jun 19 at 12:58 am

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