The fuel shut off valve is vacuum/mechanical. Not electrical.

What happens is this. The vacuum pump on the MB 616 is powerd by the engine. It feeds the brake booster, locks, and engine shut off valve. All the vacuum consumers are branched off of the main line that is connected to the brake booster.

The ingition switch aligns the vaccuum ports so that vacuum is pulled to the fuel shut off valve resulting in fuel being cut off. Since this is not hooked up to a vacuum keeper, the vacuum to the cut off valve is bled off since the vacuum pump is no longer working.

Electrically you would need to rig a timer up to shut vacuum pump off after the engine stops. If vacuum is applied to the shutoff valve while the engine is running, it will make it stop. Also, if vacuum is still applied after the engine stops, you will not get it started again until the vacuum is released.

I found that out the hard way by hooking up the cut off valve to the locking system which uses a vacuum keeper.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D