Need to oil accelerator pump before installation?

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dibbons

dibbons

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I just rebuilt a Carter AFB for a 1965 Barracuda Formula S. The old purple colored accelerator pump seemed kind of a loose fit. Even the new purple colored pump was loose during installation, too. I used a Sorenson brand rebuild kit. Now that the carb is back on the car, I just read on the internet to make sure to "oil" the accelerator pump before installation, which I failed to do. I did notice there was no discharge from the pump today after I got the motor warmed up for the first time. But the funny thing is, when I drove it around, it seems to run and accelerate just fine. Anyway, if I did not "pre-oil" the accelerator pump, what will happen? And now I also wonder if the correct pump was included in the kit? (The carb was rebuilt by someone else previously). Thank you for any advice.
 
usually after it has been in gasoline for awhile the pump will soften up and work....that is how it works on my eddy afb....which is now on the shelf...got tired of having to prime carb to get it started after it sit for a couple days...whereas the holley 3310 can go weeks and still fire up with no problems....
 
If I'm not mistaken, some accelerator pumps were made from leather. It is recommended to oil them to help soften/swell the leather upon assembly.

I'm not sure the one you used is leather or not. I don't think they are used in kits anymore.
 
Yup. If it's leather, it needs to be oiled. I just dip them in ATF. If they are neoprene, I put a thin coat of Vasoline on them.

Regardless, it should have a good STRONG stream of fuel out of the discharge nozzles when you push the throttle back. If it does not, something is wrong.
 
Thanks, after I squirted some ATF around the accelerator pump a couple of times (without dis-assembly), it has now started to squirt. Actually, the throttle response seems to have improved also.
 
70aarcuda said:
usually after it has been in gasoline for awhile the pump will soften up and work....that is how it works on my eddy afb....which is now on the shelf...got tired of having to prime carb to get it started after it sit for a couple days...whereas the holley 3310 can go weeks and still fire up with no problems....
Click to expand...
I don't believe the acc pump on the AFB's is bathed in gas like the Holley's is. They are on the bottom of the float bowl. That's the reason why.
 
I have also used grease on the accelerator pump leather when I rebuild a carter afb or 2 bbl from a 318...
 
And after all that the pump gets soaked in gas and the oil is gone.
Oiling is only to swell the leather so it works right away and the new ones don't need anything at all unless you want to be really careful about sliding them into place and not nicking the lip.
 
TrailBeast said:
And after all that the pump gets soaked in gas and the oil is gone.
Oiling is only to swell the leather so it works right away and the new ones don't need anything at all unless you want to be really careful about sliding them into place and not nicking the lip.
Click to expand...

I had to do a new one once, couldn't believe it , probly was an old kit that sat on a shelf a long time .
 
All this talk about leather and oil and pumping and squirting on a 5 year old thread.
What have I stumbled into this morning?
(Stumbled, get it?)
 
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