Quadrajet accelerator valve sticking

SGS Welding · Guru

Quadrajet accelerator valve sticking

4SPEED427 · A Poncho Legend!

There's a spring underneath it. I wonder if that spring is broken or weak maybe?

SGS Welding · Guru

I pulled a newer carb apart to try and steal that spring and pump assembly and the spring and the assembly came out easily when I checked the one in my car that newer style is too small and my spring seemed strong but also seemed like it was set in place I didnt want to yank or screw it up by pulling too hard

but it seemed strong

just stickshalfway up the upstroke

gtodrive · Guru

My experience has been the rubber cup swells and causes binding. I have had this happen a couple times to me. I have changed the rubber cup and that fixes it.

SGS Welding · Guru

It does seem swollen...

can a fellow get just a cup?

or do you need to get a whole kit?

Thanks

gparis7 · Canadian Poncho Superstar!

gtodrive wrote:
My experience has been the rubber cup swells and causes binding. I have had this happen a couple times to me. I have changed the rubber cup and that fixes it.

I've seen the same. Cup dries out, hardens or swells.

SGS Welding · Guru

Does anyone know Al Moffets phone number?

i doubt this part is available at my local NAPA?

OURWAGON · Guru

ETHANOL

WILL DO IT.

I HAD PUMP CUP THAT WAS SAID TO BE 15 % ETHANOL FREE BUT STILL WOULD SWELL UP.

FOUND AN ORIGINAL LEATHER PUMP , PROBLEM SOLVED.

SHELL HIGH TEST I WAS TOLD HAS NO ETHANOL IN IT. ( WE HAVE SHELL IN TOWN HERE)

SGS Welding · Guru

I was able to order the rubber cup from NAPA

They had one in Alberta

Now I hope its good quality (for todays gas)

And I hope its the right size (21/32)

with the garter spring

Anyone have an original leather part they would part with?

That sounds like the best fix

unruhjonny · Guru

ah, the ongoing ethanol fiasco...

Officially, Shell and Esso do not have ethanol in their premium gas;
But they do have a few stations that have it nation wide - I think Shell has one station in northern Alberta that has it.
I generally stick to Shell and Esso for just this reason - and when filling at a "new" station, I look before pumping, because it's supposed to be displayed.

Petro-Can has it in all of their gas... or at least I have been lead to believe that they do not have a fuel type that is purported to be ethanol-free...

IIRC there are probably three different styles of Quadrajet accelerator pumps;
I have personally had these in had which had wear that would cause binding even outside of the carburetor.
Best to buy a kit for that precise application number, just to pirate the accelerator pump out of it.
I believe NAPA has these kits for a reasonable price.

-- Edited by unruhjonny on Thursday 20th of August 2020 03:47:59 PM