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In page 1965 Indianapolis 500:

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Their contributions to the victory, however, have been considered overstated in some cases.[11][12][13] Historians agree that Clark's Lotus-Ford was capable of winning the race handily without the added help of the Wood Brothers. In fact, the only work done on the cars was routine refueling, as they did not need to change tires during the race.[14] Clark made only two stops all day, and the quickness of the refueling process was largely attributed to a specially-designed gravity fueling rig with a venturi tube. One of the things they did ahead of time was to "break in" the new fueling hose nozzles by simply working them in and out of the coupling for a period of time.