1986 740GLE TurboDiesel Ignition Switch????

Anyone, please.

The diesel fuel injection is mechanical and there's no electrical fuel pump. The engine is a diesel so there's no ignition system involved once it's running.

SO when one switches OFF the 'ignition switch', the engine stops. Therefore what is the control that the 'ignition switch' turns off?? It must be something electromechanical?? Anyone know the details of how all that works??? Is there a fuse in this chain??

Reply to
fred
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there is a solenoid on the diesel injection pump (look for a single (brown?) wire

Reply to
M-gineering

Thanks.

Reply to
fred

The only electrical fuel device is the fuel solenoid mounted in the pump. This has a wire which is energised with ignition "on" and enables high pressure fuel to reach the fuel distributor on the end of the pump. The only warning re this device is do not rev the engine as you switch off. The solenoid will be sucked down onto it's seat and you will not be able to get it to release until you take it out of the pump and clean/free-up/replace the solenoid. The only fuel pump is the mechanical one. I had thought of putting a small one at the tank outlet as a backup for when the fuel runs out before you can refuel. Perhaps Chilton refers to the 850 series and later diesels which have electronic fuel control and can be "chipped" to produce similar power/torque increase to tuniong the mechanical pump.

All the best, Peter.

700/900/90 Register Keeper, Volvo Owners Club (UK).
Reply to
Peter K L Milnes

Any chance of a picture, diagram or precise description of exactly where that solenoid is located? How does the wire attach and how does the wire get there(bundling/routing)?)

Are you saying the solenoid will be stuck in the on(run engine) or off position??

Chilton (8786) 72300 clearely shows in figure 120 on page 6-86 two electric fuel pumps...but I've seen ambiguous and erroneous Chilton stuff before.

Reply to
fred

Solenoid will be stuck in off position. If you look at the adjustment tower on the top of the pump the solenoid position is in front of the tower on the main body. The wire (may be part of a loom if EGR is fitted) routes between the pump and the block from below (loom may be attached to dipstick support).

All the best, Peter.

700/900/90 Register Keeper, Volvo Owners Club (UK).
Reply to
Peter K L Milnes

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