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Old 07-21-2016, 01:36 AM   #89
Praxiss454
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Join Date: Jun 2016
Location: Novato, CA
Posts: 519
Re: Newbie thinking about diving into a '65 GMC 1000

Quote:
Originally Posted by jtrichard View Post
NOT sure where the springs hook on a 6 but you can check the accelerator pump WITH engine OFF ..look down the inside of carb work the linkage with your hand to full throttle and hold it there for a second and there should be a stream of gas spray into carb... THE other thing that will make them stumble on take off is the vacuum advance on the distributor with CAP off pull vacuum hose off carb stick it in your mouth (if you don't have a hand pump) suck on it and watch the rotor it should move once it moves place your tongue over the end of hose to hold vacuum (very tasty LOL) if it don't stay or does not move you need a new vacuum advance there is also a mechanical advance in the distributor to
Looks like this video illustrates what you're talking about with regard to the accelerator pump spraying some gas: https://youtu.be/bb_m4c3xS7A In my shop manual this is referred to as the Pump Plunger Assy.

I plan on testing the vacuum advance this week as well.
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