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Engine runs poorly after hard acceleration. 120-130 1967

posted by  someone claiming to be SteveW on  Fri Mar 19 04:20 CST 2004 [RELATED]

Consider your fuel pump. Could be weak and unable to pump the proper amount of fuel to keep the float bowls full. A failing pump may be able to supply the engine under light loads, but would cause the behavior you're experiencing under heavy load.

I had a 544 that had this problem once. Ran fine on the highway on level roads or on gentle hills, but trying to pull a steep hill, it would run like it had 2 spark plug wires disconnected. Turned out the little flapper (check) valves in the pump were corroded and couldn't hold full pressure when the pump was going through its cycle.






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