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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.
May have air in the fuel lines if this only started happening after changing the fuel filter. See if you can get it to run for a few seconds on starting fluid. That should give it time to purge the air from the line through the injectors and hopefully that will keep it from interfering with the injectors. Another option is to use a rag and a small screw driver. Find the schrader valve (if equipped) on the fuel rail and depress it with a screw driver while covering it with the rag (to prevent fuel spraying everywhere) That will also get the air out of the line.
Replace the fuel filter. It should be in line with the fuel pump on the inside of the frame on the driver's side forward of the pump. There should be 1 or 2 bolts securing the bracket in place. Leave them tight and remove the fittings on the front and rear of the filter. Fuel will begin to leak from the lines as you loosen them so keep you face safely away from that area. Once the fitting nuts are backed out completely, remove the bracket bolts and then the filter. Reverse the steps to reinstall.
You should not need to bleed the fuel lines to the engine, unless you got something in the gas that has contaminated it. In that case I would drop the fuel tank, unhook the fuel lines in the engine bay and blow them out with an air hose. Air in the lines will not hurt a thing, just put the gas in it and crank it up, it may stall a few times, just restart it and the air will purge itself. Depending on what is in the fuel, diesel for instance, will burn out just drain the tank and top it up with good gas, after running out that tank of fuel change the fuel filter.
if it's an EFI engine, the smell of gas might be a couple of things....check fuel lines for broken or loose connections, a leaky fuel filter...another thing to check is the fuel vapor canister which holds vapors from the tank and throttle body....if the purge solenoid is not working for the canister then that will cause the filter in the canister to accumulate too much fuel and start leaking....so you might have an electrical problem with the purge solenoid....also check the EGR valve which will cause your engine to stumble and check all vacuum lines, especially the vacumm line going to the purge solenoid of the fuel vapor canister....the rest of your problem could be anything from timing chain to bad sensors.
You may have gotten air in the fuel lines. Diesels cant deal with this as well as gas engines should be a purge / bleeder valve on the fuel lines to eliminate the air. may cough and sputter for a while
YOU COULD HAVE AIR IN THE FUEL LINES, I CHANGED MY FUEL PUMP AND FILTER ON MY 6.2 85 K 20 SURB. HAD PROBLEM STARTING IT. DO NOT USE STARTING FLUID. USE W-D 40 INSTEAD, IT WILL RUN ON IT AND PURG AIR OUT OF THE LINES. DO NOT CRANK TO LONG AT ONE TIME YOU CAN BURN UP YOUR STARTER. HOPE THIS HELPS?