This 6 volt Airtex E8902 has been in my stock 53' Merc for 7 years now and has performed flawlessly. I turn it on for a few seconds befor starting the car, after it has sat for an extended period of time. I also turn it on when the car vapor locks, after sitting on a hot day or while driving, and it clears the system immediately.
Now I look like a hoarder, I still have the box it came it.