Carb conversion
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
I removed the regulator housing/assy from the TB.
Then I cut the potion off that goes to the injector, drilled and tapped the orifice that normally goes to the injector, for a 1/8" NPT fitting, and threaded in a nipple. That is where you connect your line from tank/pump.
In the pic above, see the part of the casting that is raised and has a "round" spot? I drilled and tapped that for a 1/8" NPT, also, and threaded in a nipple...that is your return to tank.
On the other side, where the tank return port originally was, I threaded that and installed a NPT plug. Could have put the return there instead and saved a step.
I simply hooked the feed hose from the fuel pump to the "inlet", then the return hose to the "outlet". Now everything between the fuel pump and the regulator is going to be regulator set pressure. Install a "T" in that line before the regulator, and run that line to your carb. Carb will always see your set pressure. Turn the adjusting screw all the way in to drop the pressure all the way down which should get you to ~7-8 PSI. If that is too much, cut 1 coil off the spring in the regulator, and then readjust to suit your desired pressure.
I did ^that about 5 years ago and it's still running great w/a Q-Jet carb., on the stock in-tank electric fuel pump.
Well, I don't work at the place I did that for any longer, but since I am still friends w/the folks who do work there....I'll see if they can snap a pic of it and text it to me. It isn't pretty, but it works. I could be made to look nice if that were important; fab a nice little bracket, polish it and clear coat it...it could look cool.
