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Fuel pipe/s proximity to exhaust CAT is kinda scarry
Sharing.........
I was having free time to inspect things under the car..............
The bigger pipe is fuel vapor, the smaller pipe is the liquid fuel.
They are hidden under the alu heat shield
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The CAT exterior shell temperature is very hot, more so my engine is turbocharged.
I will be applying heat shield tube like below to them pipes
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If car is moving, I am not worried.
If after a hard run on the highway and then coming into city and super traffic jam, that I worry about heat radiation from the CATs.
I know this is kinda paranoid, but safer is always better.
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After a long drive, even my car interior carpet, I can feel the propeller shaft tunnel region and close to it .....is warrm to touch, albeit interior has AC running all the time.
The trunk = HOT, easy 40C or more.
Gasoline's autoignition temperature,
the point where it spontaneously catches fire without a spark,
typically ranges from about 246°C to 280°C (475°F to 536°F) Above is not based on fuel inside a pipe.
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My tranny wire harness I have protected using DIY heat shield since many year ago.
DIY heat shield is 10 layers or fiberglass roving sandwitched between aluminum tape.
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The tranny wire, some part has the silicone anti heat jacket from MB.
Cool beans and looks a good deal to me. Thanks for sharing. This does draw my attention to this area tho I have plans for mod. I better have a look at it before so.
I finally decided to configure the sleeve as below :
The one without velcro is 10mm ID, the one with velcro is 15mm ID.
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I decided to use the 15mm ID as "sheet".
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I choose it as "sheet" because that is the only way I can push it in to as far as possible ( screw stud limit ).
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The pipes towards the rear of the car
10mm ID heat sleeve cut open and jacketing the pipes.
At first I tried aluminum tape and cable tie. Actually all cable tie is easier and better, if per 1cm I use 1 cable tie.
zoomed
Not the most elegant work, but it shall now help the fuel pipes to be no more in direct contact with the hot heat shield, while getting also heat protection from
its silicone + fiberglass sleeve.
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Heat shield reinstalled
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Hairy sound shield re-installled
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I will be away in Bali for a month.
So car is prepared for just in case flooding which may happen in January 2026 as peak rain intensity. Hence it is on my wheel stand, to raise it by 40cm above ground.
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ADD, I also heat shielded my turbo coolant hose , the rubber hose section when they are too close to turbo heat shield. There is a short section of rubber hose, not 100% aluminum pipe.
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The turbo coolant INPUT hoses are like below, from the car and the latest version. Still rubber hose section is used. Left side and right side is not the same.
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Last edited by S-Prihadi; Dec 18, 2025 at 08:08 AM.
Reason: typo
How much heat are you trying to protect the fuel lines from?
The reason I ask, is to find out how much consideration is being given to the selection of materials, that are being used to shield the lines, with regards to their ability to resist the effects of high heat.
Reading this made me think of F1 rocket engines and how the nozzles are actually cooled by rocket fuel. Because fuel needs an oxidizer the fuel can be safely channeled throughout the nozzles without it combusting. Same with the fuel line, can be run right along the hot exhaust safely.
When I was applying corrosion protection under my car i noticed a few of the metal nuts holding the heat shielding on had rusted away. The replacement nuts are expensive and have a bunch of plastic nuts used for the wheel well liners. These plastic nuts are not prethreaded so will work on different studs. I used them on the heat shielding and on the large undertrays that run the length of the car.
How much heat are you trying to protect the fuel lines from?
The reason I ask, is to find out how much consideration is being given to the selection of materials, that are being used to shield the lines, with regards to their ability to resist the effects of high heat.
All I am targeting is lesser heat radiated from exhaust/CAT >>>ALU heat shield>>> to the fuel pipes itself.
The cooler the better, for safety reason.
The same as intake breathing air the cooler the better for performance reason..
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