My low mileage 1978 Eldorado Biarritz ran super nice. It idled like a clockwork but it sometimes had one problem:
The car would have a slight hesitation for one or two seconds when driving away from standing still and idling. The hesitation was not present at any higher speeds - only when starting from standing still, no matter how hard I hit the pedal.
Once the car was rolling, it ran perfectly. 2 or 3 times the engine even stalled in the past.
That's why I suspected the accelerator pump.
Replacing it is not too difficult. You basically only need a rebuild kit and remove the carburetor from the car. Then you have to remove 8 screws to take the top off and remove 2 linkages. I'm not a carburetor expert at all, but luckily my friends ,who did the job before, helped me, but it really is not difficult at all. I found some great how-to video on YouTube on how the Quadrajets are taken apart and back together - They have some very informative videos on their youtube channel - here is one of them:

The Quadrajet after removal.
The Quadrajet with the top removed
The accelerator pump on the right side
My friends Steve and Lucky helped a lot. Thanks my friends! We did all the work in Luckys fantastic garage and shop.
We had "Carburetor Monday" as everybody was working on their carburetors.

We replaced the pump rubber and put everything back together. The carburetor looked very clean inside with only minor deposits, so we left everything else as it was.
I can't wait to install it back into the car and hope the problem is fixed - did not do a full rebuild as it is still very clean and nice inside. Only installed new rubber on the pump and new top gaskets. Hopefully the problem is fixed now. I will update the page once the carb is back in the car.

Tags:1978 Cadillac Eldorado Biarritz, 1978 Cadillac Repair Tip, Carburetor, Quadrajet, Accelorator pump, Accelerator Pump, Restoration