1920 Carb

oneway71 said
I have a '73 Duster with 39k on it. It has 225 with a Holley 1920 1 brrl. It appears to have CARB emissions. (California car)

It has a dead spot under quick acceleration. Sometimes it will stall out, sometimes I can keep it running. It acts as if it is not getting enough gas then. Runs great if you go easy on the gas. I need to feather the gas to keep running to rev up faster without stall.

Question.... Do these have an accelerator pump? If so where? I have looked at diagrams and not found one.

How does it get that extra squirt of gas when needed?

I wonder what vacuum lines can be removed? It has the delayed advance to the distributor and I would like to eliminate that.

All my other slants have 2 barrels and I know those carbs....not this one.

I could swap out my intake and go with a 2 but this car is very nice and I want to keep it close to original!

Thanks

I'm going off of memory but there aren't many lines that should go to the carb. You should have the hose going from the distributor to the carb with no widgets in between. If the hose connects to something else before the carb, then disconnect it and run that line straight.

What other vacuum lines are connected to it?

The accel pump should be in the float bowl. Take the cover off and you'll see it right there. Before you do that, take a look down the carb and pull down the accelerator linkage and make sure you get a strong shot of fuel as soon as you pull the linkage. Do that with the car off of course :D. That'll tell you if its the accel pump or not.

Make sure you have no vacuum leaks and have it timed around 8* BTDC. Having the timing too retarded can cause a slight hesitation as well.