seventytwo240z

Im not quite sure what you mean? do you mean when the pump is on the car, to make sure the arm has force on the cam lobe? if so, how exactly do I check this. I know the pump arm will move about 3/4 inch before it starts pumping, when I am checking it by hand. It only feels like the arm has force on it once I move it the initial 3/4 inch.

actually what I did was put fuel in a small container (an arixona tea bottle) and put the suction hose into the fuel. I couldnt get any fuel to suck into the pump when on the car. However when I tried pumping it by hand, off the car, fuel pumped easily. This is the only reason I suspect a cam lobe to be at fault. It just doesnt seem like the lever on the pump is being pressed far enough in by the cam to allow proper pumping. Maybe ill have to take the valve cover off to inspect further.

Hey guys, this is my first post and although I have looked at the previous posts, I havent found the info im looking for. anyway, I have a 72 240z that I just recently purchased. It has been sitting for well over 15 years. I have had it for about 2 weeks now and I have just decided to try and get her started. After some fiddling, I managed to get it to turn over. It wouldnt start, I was getting spark so I begane investigating. I found that the fuel pump was faulty. So, I took it off the car, took the pump apart and cleaned everything out so it worked as it was supposed to. When it was all put together, It worked fine when I pumped it in my hands. However when I put it onto the car it didnt work. This worries me a bit because I know the pump runs off the cam, and since it wont pump when on the car, this leads me to believe the cam lobe has become flattened and can no longer push the lever far enough to pump sufficiently. Im curious if this sounds right, or if the problem is common. thanks guys!