It's VERY difficult. What worked for me, a vacuum cleaner with two extensions, two smaller diameter short extensions with LOTS of electrical tape to attach and make up the difference in diameter, then ending in a piece of fresh fuel line cut very square on the end. Turn on vacuum, put head of thrust button to the hose and maneuver it into place, when you get it there, turn off vacuum. Other than that, remove the center section.

I'd be interested in seeing if anybody else did this another way without removing the center section. What I did was my last desperate plan before giving up. Nothing else I tried even came close to success.

Robert