Your hand pump is mounted on the left, lower side of the injection pump assembly. It has a round handle, about an inch in diameter, which you can stroke. You don't have to loosen anything to bleed the system. Just pump the hand primer, and air will be bled off the air bleed bolt on top of the filter. Some pumps though have a small screw in top of the injection pump housing which you can loosen while bleeding / pumping.
If you've still got power problems, try this:
Check your pre-filter. This is a small filter located on the suction line, before the hand pump.
Check your fuel shut-off lever. Your shut-off cable could be pulling on it a bit, and limiting fuel a big bit.
More difficult: Check fuel strainer inside fuel tank.