當(dāng)凸輪的凸起部分轉(zhuǎn)過(guò)去后，
在彈簧力的作用下，柱塞向下運(yùn)動(dòng)，
柱塞上部空間（稱(chēng)為泵油室）產(chǎn)生真空度，
當(dāng)柱塞上端面把柱塞套上的進(jìn)油孔打開(kāi)后，
充滿(mǎn)在油泵上體油道內(nèi)的柴油經(jīng)油孔進(jìn)入
泵油室，柱塞運(yùn)動(dòng)到下止點(diǎn)，進(jìn)油結(jié)束
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柱塞向上供油，當(dāng)上行到柱塞上的斜槽
（停供邊）與套筒上的回油孔相通時(shí)，
泵油室低壓油路便與柱塞頭部的中孔和
徑向孔及斜槽溝通，油壓驟然下降，
出油閥在彈簧力的作用下迅速關(guān)閉，
停止供油。此后柱塞還要上行，
當(dāng)凸輪的凸起部分轉(zhuǎn)過(guò)去后，
在彈簧的作用下，柱塞又下行。
此時(shí)便開(kāi)始了下一個(gè)循環(huán)。
柱塞泵以一個(gè)柱塞為原理介，
一個(gè)柱塞泵上有兩個(gè)單向閥，
并且方向相反，柱塞向一個(gè)方向
運(yùn)動(dòng)時(shí)缸內(nèi)出現(xiàn)負(fù)壓，這時(shí)一個(gè)
單向閥打開(kāi)液體被吸入缸內(nèi)，
柱塞向另一個(gè)方向運(yùn)動(dòng)時(shí)，
將液體壓縮后另一個(gè)單向閥被打開(kāi)，
被吸入缸內(nèi)的液體被排出。
這種工作方式連續(xù)運(yùn)動(dòng)后就形成了連續(xù)供油 。
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