| One day I smelled fuel like crazy and looked under the hood. There was a short section of 30r6 that was all swollen and buldged and leaky... And even though the stock hose clamp was fully tightened I could easily spin it by hand. I could tell your Z had 30r6 because the outside of the line looks checkered/honeycombed where the 30r9 does not. I looked it up later and working pressure for 30r6 is 20 psi and a burst of 250 psi. Where the 30r9 has a working pressure of 100 psi with a burst of 900 psi. Although it did not burst It seemed as though the rubber had compressed so much that it no longer had a good seal.
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