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Calculating total fuel quantity (FS9 and FSX, C++)

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I recently realized that I was using an FSX only value to calculate fuel in my ACARS, which obviously was creating issues with FS9 users. I've adjusted the code to use FS9 capable variables, and calculate the fuel by subtracting the zero fuel weight from the total weight.

I'm fairly confident that my code is correct, seeing as though it does indeed record the appropriate value in FSX, however, is still doesn't record from FS9. Is there something else I'm missing?

The relevant code is below:

DWORD result;
FSUIPC_Open(SIM_ANY, &result) //I'm using this as my connection open code

//The actual code does indeed have more error checking than this, I just chose to copy it this way for simplicity.
int ZFW;
long long TWEIGHT;
unsigned long result;


double zero_fw = ZFW / 256;
double fuel_w = TWEIGHT - zero_fw;
p.fuelquantity = (int)fuel_w;

I appreciate any assistance in advance.

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