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The point was a 2% change in length won't affect timing. The IP is still sending pulses of fuel in the correct time. This isn't direct current. It's more akin to alternating current. The fuel that the IP shoots out on a given injection event isn't all going into the engine. It is displacing...

Are we sure that drill bit "pin gage" is giving us an accurate ID? Is the end maybe distorted some from cutting?

Well put, Rusty. The only thing I would point out is that the metered fuel you are adding to the line does not have to travel the length of the line. It is only displacing an equal amount of fuel at the far end. However, this is somewhat double edged as the little bit of fuel squirting in one...

This is great info since one of the lines on my m109 is leaking at the HH. I haven't noticed it affecting the performance, but I do have to let the lift pump run a while before cranking if I expect it to start smoothly.