Carb question, need to dump little gas in carb just to get car started Options

[angerosa]

Seems that this year I need to put a little gas into the carb to get the car started initially. I have single Solex carb that no one seems to be able to identify. I'm sure some PO just pulled it off something that was sitting in a junkyard. Once I get car started and it warms up it idles OK but runs rough when you try to drive it. Timing is spot on. Recent (not too many miles ago) tune up with the help of some very knowledgeable 914world brethren. Let’s say it’s a given that there is nothing wrong with the engine. I have an idea of where to go next. I’ve had car for about 7 years. With only what I’ve told you here what’s your opinion?

[ThePaintedMan]

Assuming it works like every other carb (and physics dictates that it does), you are correct. The accelerator pump should engage with the initial application of the throttle to a mechanically-activated shot of fuel with the in-rush of added air. On some carbs, like the later Webers, this can be adjusted based on how rich the idle circuit already is or how the carb transitions from idles to mains. Every engine "wants" something different. Is there any visible kind of adjustment on that carb, or a reason why it isn't activating with the initial application of throttle?

While you have it out, you might try to carefully remove the accelerator pump cover to inspect the diaphragm. If it's still supple, you could reinstall it and focus on figuring out why the arm isn't actuating the pump itself, and it might be enough to get you to the event you're trying to go to this weekend.

However, since you've had the carb on the car for at least 7 years and with modern fuels, I still betcha it's time for rebuild.

[angerosa]

Assuming it works like every other carb (and physics dictates that it does), you are correct. The accelerator pump should engage with the initial application of the throttle to a mechanically-activated shot of fuel with the in-rush of added air. On some carbs, like the later Webers, this can be adjusted based on how rich the idle circuit already is or how the carb transitions from idles to mains. Every engine "wants" something different. Is there any visible kind of adjustment on that carb, or a reason why it isn't activating with the initial application of throttle?

While you have it out, you might try to carefully remove the accelerator pump cover to inspect the diaphragm. If it's still supple, you could reinstall it and focus on figuring out why the arm isn't actuating the pump itself, and it might be enough to get you to the event you're trying to go to this weekend.

However, since you've had the carb on the car for at least 7 years and with modern fuels, I still betcha it's time for rebuild.

So just to confirm... The "at rest" position should be butterfly is closed, accel pump is actuated with the slightest push of the peddle?

I noticed that when I had disconnected the fuel line, and took the carb out, I was pressing the actuator arm against the acel pump button and it was spraying a good amount of gas in the barrel... I did it more than a couple of times. Maybe I need to just adjust that cam shaped actuating arm. Possibly it is not tight and got pushed back or I did it a couple years ago without realizing it.

That's my exact symptom that if I hit the throttle hard it would stall out. Accelerate slowly and it worked Ok but what fun is that. I think I'll try to adjust it and put it back in just to see. Anyway, rebuild kit is on the way...