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| Joined: | 03-12-2005 |
| Location: | Kingman, Arizona USA |
| Posts: | 532 |
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As Mitch notes, the usual cause for the problem you're having is a clogged fuel filter. The quick and easy solution is to change the filter. The long-term and more difficult solution is to remove all rust from the fuel system (primarily, the fuel tank).
If you don't have a filter just before the tee for the carburetors, even freshly rebuilt carbs can suffer from small rust particles coming from the insides of the fuel lines. Usually these prevent the fuel inlet valve from closing, thus causing flooding. Since the problem goes away when you lighten up on the throttle, though, it's not too likely that this is what's going on in your car.
Another possibility is that your fuel tank is too tightly sealed. Here, removing fuel from the tank results in a low pressure there. Eventually the pump is unable to withdraw more fuel, but starts working again as once some air leaks in. You can prove or disprove this by unsnapping the fuel filler cap and making a test run.