It’s been said a bunch of times above - you’ve got some sort of timing issue if it backfires. Make sure your timing marks are correct on the damper, use a positive stop on piston #1.
I’m lazy, and decided not to install an electric fuel pump. What I do when my dart sits and the gas in the avs evaporates - is I take a small amount of gas (about a 1/4 cup) and pour it into the fuel bowls through the bowl vents. Then it starts immediately !
The only vent on a AVS that I know of is the one that is on the driver's side. It is fairly easy to add fuel to that side, but how do you add fuel to the passenger side bowl? Can it be done?
