engine doesn't shut off

[VicS]

I am afraid the problem is not a simple as it seems . I have learned!

I am told that the solenoid on the back of the pump is the fuel metering control valve which actually controls fuel intake volume to the pump. This valve is controlled via the ECU using negatively triggered PWM signal. This is NOT a simple stop solenoid.

It is strongly recommended that a Volvo engineer is called to sort this problem out.

This engine is I believe, a marinised version of the 2.4 litre 5 cyl engine fitted in Volvo V70 cars. Its whole different kettle of fish to the old MD22/ Perkins that was fitted in Montegos eons ago

 

[Playtime]

On my Perkins Prima (M22L equivalent) there is a relay between the control panel and the stop solenoid.
So before you go out and buy an expensive solenoid you should check that the relay is working properly. Even if it clicks there may be contact problems.

Just to put this bit of thread drift to bed, there is NO relay shown in the stop circuit wiring diagram for the MD22 in the Volvo Owners Manual. There are 3 relays, used for earthing the block, glow plugs and starter.

However, as we now all appreciate, the MD22 is not the same as the D3.