If you choose to use an electric motor driving an eccentric for a mechanical fuel pump, usually they only deliver about 2 psi for a petrol version, or 5 -7 psi for one intended to feed the rotary injection pump on a diesel engine. (In Line injection pumps are often fed at about 10 -15 psi). You are not really interested in pressure, more in delivery volume, so anything should be OK.
My coolant (cutting lubricant) system uses a gravity feed, with about a two foot head to a needle valve (which spends most of its life nearly closed) and a 1/16 jet, so no great pressure is essential.
The inlet and outlet valves are usually Tufnol, so the only parts at risk of corrosion are the alloy parts of the pump body, or the brass gauze present under the steel top cap (if one is fitted)
An electric feed pump, of the SU type will run off 12 volts continuously, as it does in a car with a carburretor.
Got to be worth a try
The feed pump, usually tank mounted , in a petrol with fuel injection, operates at a much higher pressure, maybe upto 60 psi, so probably not such a good idea.
Best of luck!
Howard