A320
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Fuel Issue
Equipment / Tooling; Human Factors
Our flight release and our fuel slip said we were planned with a ramp fuel of 40;000 lbs. The flight plan portion of our flight information packet said we had a planned fuel load of 39;657 lbs. I in fact wanted to have 40;000 lbs for extra taxi fuel that may be required for EDCT (Estimated Departure Clearance Time) delay to ZZZ1. I was confused why our paperwork had two different ramp fuel numbers so I called Dispatch to ask why the difference. The Dispatcher told me that he bumped our fuel up to 40;000 lbs; but the computer wouldn't update the flight plan numbers. This seemed wrong to me. I told him that it then makes all of our fuel planning numbers in the flight plan inaccurate because it is based on a fuel number 300 lbs less. I was then told by Dispatch to just add 300 to everything. I could do that; but would be just guessing on how that changed any of the times associated with those new numbers.I suspect the flight plan numbers can be updated; and either Dispatch is not informed on how to use the program; or there is some other reason they have to not want to update them. If in fact the flight plan fuel burn numbers cannot be updated when fuel is added; then this in an inadequate software program and [the Company] should consider a new vendor.Also; although 300 lbs does not make a huge difference in our performance; larger changes would. Having to just do my best guess on how much time 1;000 lbs extra versus 1;300 lbs extra gives me doesn't seem like a great policy. Dispatch running these numbers allows pilots to perform other duties. If Dispatch can't provide these numbers with any changes; expect delays as crews run the numbers through performance charts in addition to all their other preflight duties. That way we can get accurate numbers that should be provided by Dispatch versus just guessing.
A320 Captain reported not receiving correct Fuel On Board (FOB) numbers in flight plan.