Handyman, I have used the "bolt in line" technique before...haha. Every other season, I used to clean and inspect my snowmobile carbs. Now, both of the sleds my girlfriend have are fuel injected so I dont mess with those too much. But, If I was going to have carbs off sleds for a long period of time, I would pop fuel lines off, plug them with bolts, do my servicing and put everything back together.
I thought about putting a shut off valve in, but that is just another set of connections to possibly leak or accidentally come loose in future. Then add a inline filter to the mix, and that adds yet another connection to the mix. Simple is sometimes better.
It is amazing though how many different ideas and ways of doing things each and every one of has. Pretty creative us humans are...haha
I have to say it again, as a new member on here, I am still excited about how friendly and willing to help everyone on this forum is, great place to be. I have been on motorcycling and snowmobile forums where people literally scream at you because you should already know how to do this or that, or make you feel like dirt because you didn't use the search feature before you posted.
Jim