Hi Bfinney87, the only reason that fuel will spill out of the bottom of an injector pump is that there is excessive wear in the injector element.
The element is the tiny little piston pump inside. These are so finely ground that they withstand pressures of 2000 ponds per square inch without leaking. Any ingress of water or dirt will very quickly degrade them to the point where they leak out of the bottom and won`t provide sufficient pressure to pump fuel through the injector. The telltale for a worn injector pump is that the oil level in the sump starts to rise.
Replacement elements are available, they are a lot cheaper than entire fuel pumps and can be fitted yourself provided you are a competent mechanic and are religious about cleanliness while you are doing the work. If in doubt take it to your local diesel engineer and have him do the work.
If one pump has failed the chances are the the others have also been exposed to dirt or water, flush them thoroughly to ensure they don`t suffer the same fate. Flush your fuel system, fuel lines and replace the fuel filters.
Best of luck, Bob