I know that these are Chrysler engines, but here's a story.
GM discontinued their V engine mechanical fuel pumps in/around 1991, in lieu of electric fuel pumps (not electronic).
The cylinder blocks were no longer fully machined for a mechanical fuel pump.
This meant that the Marine industry had to also begin using the electric fuel pumps for the GM engine installations.
The common electric fuel pump (for carbureted engines) became the Carter brand.... also labeled as Merc, Volvo Penta, etc.
This pump was commonly mounted in the same area as where the mechanical fuel was previously.
Now... a mechanical fuel pump is engine driven. Engine runs/fuel pump operates. Engine quits/fuel pump quits.
USCG likes this idea.
An electric fuel pump must have a means of cutting electrical power if the engine was to quit.
This is done via a N/O low oil pressure switch in the pump's power circuit.
But there's a problem with this!
During start-up (prior to oil pressure being reached), nothing sends power to the pump.
The system now requires a Start-by-pass circuit.... of which is easy to do via a relay system.
Now... here's what will benefit you.
It's perfectly legal to have a helm located momentary switch for this fuel pump (must be momentary) that will by-pass the N/O low oil pressure switch circuitry.
This will allow you to operate the fuel pump before the starter motor has even been engaged.
This will also allow you to forgo the Start-by-pass circuit (optional) as long as you remember that priming is necessary.
Just make darn sure that you incorporate the N/O low oil pressure shut-off circuit, or you will be violating USCG regs.
This is a fairly straight forward installation.
BTW.... if you intend to augment the mechanical pumps via the electrical pumps, one of the pumps would be feeding the suction side of the other.
Technically... this would work due to the pump's check valves.
However, you may want to check and see if there would be any issues with pressure feeding the suction side of either the mechanical pump or the electric pump.
My gut feeling is.... it would not be allowed.
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