That's a good question... :? ....lol
When I did mine I think I used like an inch and a quarter hole saw..it was years ago so I am not sure...I know it was a prety big hole saw. I then filled it with hot soapy water and sloshed it around and dumped it...did that several times then blew it out with air hose.Only reason I went that rout is because It was a nice 72 Chevelle street car and I didn't want to put a fuel cell in it because the way those cars sit the tank is visible and I figured it would look funy with no tank. I used -8 stainless line with a Mallory 140 pump and I had the filter mounted between the tank and pump never had any problems. I still have the car but I never drive it. It was my first car and I could never bring myself to sell it. It sits in my parents garage covered up. ( I am 33 almost 34)
