I have an old YSE 12 and the fuel pump doesnt seem to be working, it does not have the preassure to supply the fuel through the high preasure fuel line to the injector.
it is an old pump, very simple construction with a piston like ram on a spring in the rear that gets pumped to supply the preasure to force fuel through a ball bearing and spring set up on the outlet side. when I take the high preasure hose off the outlet and crank the engine over there is no fuel coming out under preasure???
Hope someone can help"