I just put ten pumps of grease of a different colour to the previous grease and none of the new was expelled.
How many miles since the last time it was greased? If it's been a while then this may not necessarily indicate a problem. On occasion in the past I have let mine get up to nearer 1500 miles before greasing, and the amount it took was quite surprising - I seemed to be pumping grease in for ages, certainly more than 10 pumps, probably nearer 15.
OTOH, if you regularly grease at 1000 miles or less, and you don't have HC pins installed yet, then it could indicate your bushes are worn and need replacing. Have you checked the play in the kingpin?