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Mechanical fuel pumps of that style had several problems:

* Even a small leak on the INLET side would allow enough air in to prevent fuel from being pumped to the carburetor. * When a mechanical fuel pump was completely empty (all air, no fuel) It often took a while to clear out the air and pull in fuel. * It was easy to install them wrong, especially if the arm was the wrong length. Go back, check the installation. It's usually something that you weren't thinking about.

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Q: 85 Chevy V8 350 new fuel pump on the side of engine not working?
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