I will be using this
Made in the USA Facet model FAC-40007 in line with the mechanical pump, along with a primer button as mentioned by Ed Synder.
Facet Cylindrical 12v Fuel Pump, 1/4 NPT, 4-5.5 psi
Brand: Facet-Purolator
For higher fuel volume requirements of engines above about 150 horsepower, the high-performance Facet Cylindrical pumps can deliver. Pumps can also be combined in series or parallel to achieve any required pressure or flow. Facet fuel pumps have low power requirements (about 1 amp at 12 volts) and operate without troublesome seals or diaphragms. Built-in pressure relief means no flooding after shutting down a hot engine. Facet pumps are compatible with gasoline, alcohol blends (up to and including E85), diesel, biodiesel, and fuel additives.
Maximum fuel delivery 36 gallons per hour. Maximum pressure 4 to 5.5 psi. Typical flow 23 gallons per hour at 2 psi. 1/4 NPT female ports. Negative ground (12v) only. This pump features an internal 74 micron filter.
This pump does not have an anti-siphon valve, so fuel can flow through when the pump is turned off. Facet part number 40007(E)*. This pump can also replace Facet pump numbers 40134 and 40220.