If you end up plumbing the solenoid valve in between the lift pump and injector pump, you will need to add a separate fuel pump to the vegetable oil circuit. The injector pump can create very high pressure, but produces nothing in the way of vaccuum. The lift pump is required to keep the injector pump fed with fuel. I would put the solenoid valve before the lift pump. Installation will be much simpler.
Dan Albano
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