Brian, when you did the timing chain, you had to replace the fuel pump eccentric exactly as it was before. It consists of two round cups. The retaining bolt is off center so the cups look out of round. There is a locating tab on the inner one. It goes into a hole on the timing gear. So as the camshaft turns the gear, the eccentric rotates out-of-round and pushes the arm on the fuel pump. The way to test is to remove the fuel pump, push a wooden rod into the fuel pump hole, and hold the wooden rod against the eccentric, and have someone crank the engine. You will feel the rod get pushed in and out. It is easy to get it wrong and unfortunately the only fix is to remove the timing cover and re-situate the eccentric.