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I'm in the process of repairing the fuel lines on my 2005 Cobalt, they rusted out where the heat shielding is, I've got the rot cut out and the new lines ready to be put together, I'm using the nickel-copper line. I want to find out if it's necessary to replace the heat shielding I cut out, or if I could wrap the exhaust in some heat shielding to prevent corrosion in the future. Thanks.
 

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I wouldn’t recommend not putting the metal heat shield back. Wrapping the exhaust is not really sufficient. The main problem you may experience if the fuel line isn’t shielded from the exhaust heat is something called vapor lock. It happens when the fuel line is heated. The car may start just fine when cold, but may not restart after being turned off and restarted when hot after being run. Also it’s not a great idea to overheat a fuel line, kind of dangerous territory.
 

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Contradicting the last post here. But the only part of my fuel line that was rusted was the part that didnt have any heat insulation on it from the factory. So Id definitely say use the shield and wrap it. Mine is in the same spot too, right next to the exhaust. Really odd that they left a good 5 or so inches exposed but put insulation everywhere else near the exhaust. Still waiting for it to get bad enough or for it to be a recall. Last i checked there's a party pushing for this known issue to be recalled.
 

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The new nickel copper line you’re installing will be much better than the original steel line as far as corrosion goes I would wrap it with the heat wrap that you took off


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