Strong start but dies when accelerator pushed (1 Viewer)

[newbtrayback]

Morning! My 77’ has been having issues for months and I am stumped. It has been dying when I coast in neutral or engage clutch to shift but quickly comes back in gear. Fires right up at Cold start in the morning but once I press on accelerator, it dies.

I just replaced the Dist/ignitor with one- in-all unit with new wires/plugs and properly gapped. New Weber carb that was built/tuned for my 40,

I appreciate any thoughts you might have.

Happy Saturday!

 

[charliemeyer007]

I would check the accelerator pump if it has one - not a Webber guy.

 

[newbtrayback]

I am going to test fuel pump later. It looks like the original

 

[Steamer]

Did your issue begin before, right after, or sometime after the new dizzy & carb install?

Just to be clear, Charlie was referring to the “accelerator pump” inside the carb, and not the fuel pump.

 

[Pighead]

What is your timing set at?

 

[newbtrayback]

Hi all.

Problem was happening before new parts.
LCS in Austin installed the new dizzy so not certain of timing.
This morning it started right up and I let it idle for about 5 minutes. It was idling a little high like I would expect and once I pressed accelerator it immediately died. Started again and within a minute of idling it started to die and I pressed accelerator and it came back but once I let off the gas it would stumble and die unless I accelerated again.....fuel pump looks original and or maybe vacuum leak somewhere???

 

[newbtrayback]

Vacuum leak at base of carb.....spread modest amount of high temp caulk on gaskets and got a better seal. Also thoroughly cleaned both base plates until shiny before reinstalling.......what was the saying about doing it right the first time????

 

[DeskJock]

I second the vacuum leak conversation. And if you have a brake booster, need to throw that into the “Rule it out” list.