I worked fast and still got fuel leaking down my arm. I am guessing it would be better to clamp off the incoming line, other than that no real issues. Be very careful about the fittings as working in that tight space they can be cross threaded easily.
Priming is real easy, just push the start switch a few times without letting it crank and then start her.
2002 Damon Escaper (Sassafras). 3126E Caterpillar, Allison 6 speed.