As everyone has already mentioned your problem is probably tied to excessive heat in your fuel line. What they haven't offered you is an EASY solution (if there is one) Check your fuel line in the engine compartment and make sure its sufficiently located away from heat sources. You mentioned that this started after installing new headers. Headers dissipate much more heat than standard exhaust manifolds perhaps you need to wrap your headers with some sort of heat tape to bring down the temperature in the engine compartment.
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