Question on changing SB mechanical fuel pump

If everything is OK, it will pour out of the hose. If possible, do the job when the tank is low. To stop the flow you can:
1. plug hose w/ a bolt
2. slip a new hose over tube and route it high.
3. after #2, blow into hose to force gas back into tank
4. first remove hose back at sender, if <1/4 tank no gas should flow out. good idea to change that hose every 10 yrs anyway.

For new hose, use only "fuel injection" type, not the old carb type, since many of the later can't handle alcohol and are easier to collapse and starve the engine.