The vacuum-relief valve opens to allow enough air to enter the tank to replace the gasoline pumped from the tank by the fuel pump . 真空阀通向大气，使足够的空气进入油箱，以补充由输油泵从油箱中吸出的燃油所占的面积。
A fuel too volatile for the outside temperature, or a missing restrictor in the vapor line, will also cause improper engine idling . 就外界温度而言，燃油的挥发性过高，或蒸汽管路中的节流器有故障，也会使发动机的怠速不稳。
In the course of the early rig tests it was observed that, within limits, combustion efficiency was largely independent of the size of the fuel jet . 在早期的试验器试验时，已经发现在一定权限范围之内，燃油喷注的大小对燃烧效率影响很小。
