You're probably only a cup over. Beyond the top mark very little goes a long way. But it's a cup that'll cause big problems so get it out of there.

Don't hook a hand pump directly to fluid or you'll make a mess of your pump. Have the pump evacuate a sealed bottle and run another line from the bottle to the dipstick tube. That's basically the brake bleed attachment for a MityVac.

Sixto
93 300SD 3.0