If I am not mistaken, you have the Detroits w/DDECs and there should be fuel priming pumps for each engine. If it is similar to the setup in my engine room the priming pumps are big heavy duty DC viking gear driven pumps. I checked and the pumps are capable of continuous running (2 hrs). I had the momentary switches changed out for on/off switches w/safety off covers. Once I had the switches swapped out, I was able to use the pumps to not only transfer fuel between tanks but also polish fuel.
If you do this, a few notes I have found to be good practice: 1) When transferring fuel, do the calculations to ensure you do not over fill a tank. 2) Ensure your primary and secondary filters are capable of handling the fuel flow for filtering. 3) When poshing the fuel I suggest staying in the engine room to monitor for any potential issues (leaking line, clogged filter, psi/vacuum/level gauges, etc). 4) Call me over cautious, despite the safety on/off switches installed on the pump, I keep the breaker for the pumps in the "off" position when not in use (just like many do for the remote oil drain/fill pump system).
