Chris Craft Cavalier intermittent stalling

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Looking for help diagnosing an intermittent stalling problem with my 1960 Chris Craft cavalier. It has a Chevy 283 engine. The stalling occurs intermittently and only at higher speeds. She runs at very low speeds indefinitely without stalling. I think the problem is fuel related, not ignition. The problem gets worse as the fuel level in the tank declines. With a full tank, it runs fine. I am thinking that the problem is possibly something in the tank itself. The fuel pump is only one year old. I just replaced the fuel-water separator, that did not help.

[Steve in FL]

Check for rust/sediment in the tank, is there a filter other than the separator?

[jahearne]

Also check that the tube in the tank drawing the fuel up from the bottom isn't compromised, has pin holes in it.