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Yes, I fully understand why they are normally closed, to guarantee powering off in the event of a failure and so no power is consumed when the engine is off.
However solenoid type valves use a lot of energy to hold their non resting position (22-24W) in this case and a servo actuated cut off would be a much better option.
Of course reversing the current on the solenoid won't reverse the direction of travel anyway so my point above about the 1 wire etc is moot.
The difficulty with a servo based alternative is the mechanical interface into what is a pressurised (albeit relatively low pressure) area.
How is shut off achieved on more modern diesels, via the electronic injectors?
I'd really like to eliminate this load as it's pretty pointless and will add (2Ah x my desired runtime) to my battery requirement.
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