Few benchmarks of the Brazilian Fundamental Vertical Network (BFVN) have measured gravity values. While its leveling lines have been established since 1945 with approximately the same technical specifications, different institutions performed gravity surveys with different standards. To improve the BFVN aiming its connection with a “world height system”, studies were started in 1995 focusing on the area of the Brazilian Vertical Datum. Since 2004 the lack of gravity data and other particular aspects of BFVN were included in those investigations, as well as the integration of satellite altimetry data as a way to evaluate the BFVN at some selected tide gauges. The first step of the work was the definition of procedures for integrating gravity values into the BFVN. This led to selecting a test area where recent leveling lines are entirely covered by fairly homogeneous gravity surveys from the same institution, allowing for investigations on methods for gravity interpolation, and the resulting error propagation from leveling and gravity data into geopotential numbers. Parallel efforts were performed to collect and analyse gravity data from other institutions, resulting in the detection of some systematic discrepancies.