I bought a new timing chain from FRPP and I'm wondering if I need to replace my fuel pump eccentric? I have never heard of this part before, and I have searched but all I find is efii to carb swaps. My car is efi, and runs poorly at the moment. It seems like the car is cutting out on fuel. Can anyone shed some light on this subject?i don't know whether my fuel pump is mechanical or electric... How do I check? Could it just be a bad eccentric?