Maybe there was a cap on it. Often, to reduce inventory, the rebuilder will make just a three-port pump that can be used in either application. If the third port is needed, it's there, and if it isn't used, that same pump can be used with the unneeded port capped off.
Look at the gas tank too if you can see where the hoses go in. There will be a larger diameter hose for the supply and a smaller one to take vapors to the charcoal canister. If the third hose on the pump IS used, there will be a third hose at the tank.
Tuesday, May 3rd, 2011 AT 10:27 PM