Vacuum port on QuickFuel

[MrMagoo]

Hi Keith. Thanks for your help the other day on my fluid leak. All fixed. Now I am tuning up, and I noticed that there is an open vacuum port on the carb, to the right of the electric choke as you are looking at it. It's a QuickFuel.

Should this be plugged before I proceed? Since you guys dynoed the motor I presume this either should not be plugged or it doesn't matter, but I thought I would check with you just in case.

[Keithc8]

I do not believe that what you are looking at is a vacuum port. You can block it of and see if the idle changes any. I believe if it was a vacuum port the engine would not idle. Thanks, Keith

[MrMagoo]

Its definitely a vacuum port. I plugged it, and later I had a vacuum gauge attached to it. 13.5 inches at idle. It's a straight manifold port, the one next to it is the timed port.

I have the car running with my old edelbrock carb (which I have made no serious effort to tune), and I am driving it to a guy who does Cobra engine installs so he can tune the QuickFuel and get it running. He has a chassis dyno, AF meters and all of that good stuff (as opposed to me in the driveway with a screwdriver and a Holley tuning guide....)

With the old (mostly untuned) edelbrock carb, the motor runs fine above 13-1400 but stumbles a bit under load off idle. The motor itself is beautiful, sounds great, runs strong, I just need to get this carb thing debugged. I'll have him check it to see if I introduced any dirt (I tried to be careful but you never know), check the floats, and do the jets as you suggested.

Thanks Keith.

[Keithc8]

I misunderstood the one you were talking about. the two that are together should be plugged and any others that you find open. If you keep having problems with the carburetor we will get you another one and have Quick Fuel fix this one. I am having a problem with one that I just put on one of the Kirkhams that i have just finished. I believe the fuel pressure might be a liitle high on it at 8 PSI. I had to lower the fear floats on it because they were flooding over by the boosters. when I lowered them it seems to be fine. Just let me know how we can help because the carb should work fine. Thanks, Keith

[MrMagoo]

Thanks again Keith. I should have some info for you in a couple of days as far as whether I think there is a problem with the carb.

[MrMagoo]

Took off the fuel bowls and the primary float was stuck. I freed it, and I got the Quick Fuel idling fine. My next problem was a straightforward tuning problem, a stumble off idle from a stop. I fooled around with the four corner idle screws, (they are out 1.5 turns on the primaries and 1.25 on the secondaries) now it's a lot better. I'm going to keep after the tuning to try get it optimal, but the carb seems to be basically just fine. Now it's down to the guy with the screwdriver.