I also got a fancy one, but decided on a true backyard mechanic's version.

Since I have to run a cell in Production, it was very easy to put in a "T" valve on the return line that dump's back into the cell. A single 6" of fuel hose with a bolt stuck in the end verifies that it won't leak.

This was it's on the "low pressure" side of things, and can be done with the car off. I tried to put the fancy one on the "high pressure" side of things, but had to have the ignition on for it to work.

Didn't like that part of a hot ignition, and dumping fuel into a bottle.

Yes, I know that 17.4.2 states that the port must be between the tank and the fuel injectors, but it doesn't say that it can't on the "return line" from the injectors to the tank.