I'm not sure if I understand the question, please correct me if I'm wrong. Remember the bullet doesn't leave the barrel instantly, it does take time, granted it's in micro or milliseconds. Kinda like which barrel will have the bullet leave first, a 16" barrel or a 26" barrel.
The injection pump itself is timed to the engine, so if the pump is designed to deliver fuel at say 2° BTDC (injector needle lift is just beginning). If the lines are shortened, the fuel will begin to lift the needle 8° BTDC. Now this is messing the pump to engine timing up. If the injection line is lengthened, the amount of time for the displayed fuel to move down the injection line might cause the needle to lift 10° ATDC.
Keep in mind, when fuel is pumped, the fuel isn't instantly displaced. It seems it because the the time is so fast, typically in milliseconds. but there is a lag.
Imagine 2 garden hoses, one 50' and one 75' long, both filled with water and baking in the summer sun. Both nozzles are opened at the same time. Which one will get the cold water (out of the well) first (facet pressure being the same)? The shorter one will see cold water first.
If only one or two lines are shortened, the engine performance will suffer because some cylinders are being sprayed with fuel and "igniting" or "firing" too soon, maybe while the piston is only halfway up its compression stroke (an exaggeration for visual help). And then the others are firing while the piston is already past compression, thus not a very good running engine, if it runs. Idle smoothness will suffer and raw unburnt fuel will be probably wind up in the engine oil if the engine runs long enough due to incomplete burning.
On my other posting, I mentioned over the nose of the cam. I am referring to the pump cam, NOT the engine cam. This could happen on electronic pumps, if the pump timing (computer program) was reset or adjusted to account for new line length. I don't believe I made myself clear on that one. Sorry about that.....sometimes one will forget the audience he is talking to might not understand my babblings...lol
Did I answer the question? If not, please let me know.
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