Car not starting
The below will only be relevant if the engine ran properly before you changed the fuel line, so making an assumption on that. Not sure what you mean by "won't start fully". After replacing a fuel line, it could take a while for all the air to be purged from the fuel line. If this means the engine will fire, but stumbles and misses, and you are sure you have purged all the air from the fuel line, then you may have introduced contamination into the fuel system when you changed the fuel lines. If there is a fuel filter downstream of where you replaced the fuel lines, try replacing the fuel filter. If there is no filter downstream of the replaced fuel line, then the fuel injector could have caught the contamination. That scenario will be very time consuming to fix...R&R fuel injectors.
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