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Ozz, I won't resay what everyone else has said except to offer an explanation and a tip. Your fuel pump is a diaphragm type pump, and the diaphragms do wear out over time and cause not only "leak down", but eventually other problems like stalling and poor or sporadic acceleration.
When changing, you will find there is a rod that is driven off the camshaft that presses against the arm on the pump. Getting that rod back in place while trying to install the pump is an exercise in frustration unless you do this: at the front of the block, you find a bolt (I believe it's on the timing case cover, but it's been years since I've done one of these). the bolt hole is drilled and tapped all the way through to the hole the rod that drives the pump. taking out the existing bolt will allow you to hold the rod in the up position while you screw in a longer bold to hold it there so you can slip the pump arm in with no problems. Just don't forget to replace the bolt with the original one when done.
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