Hi Outwest:
Hope this partially answers your question.
If the delivery pump pressure is unknown, or exceeds 3.8 bar (55 psi), then
gravity refuel must be used.
[3.8 Bar or 55PSI should give you Approx 120 USG or 100 IMPG or 840 Lbs or 454 LTRS / Minute (providing I got the math right.)]
There are primary and secondary high level pre-check tests to be carried out when commencing pressure refueling to confirm that the high level switches in the tanks will cut off refueling at the proper time.
Max fuel capacity with pressure refueling 764 USG 2890 Ltrs 5175 LBS.
Max fuel capacity with gravity refueling 713 USG 2700 Ltrs 4830 LBS.