I think the .035 wall tube will be fine... but you might want to consider aluminum tube, rather than SS. Aluminum has a bunch of advantages:
1. Lighter
2. Easier to bend
3. Conforms better to seal surfaces, so it leaks less
4. Has a higher coefficient of heat transfer (mu), so heat in the gas can radiate
Some dislike aluminum due to its lower strength and the notion that it can be "punctured" from road debris, or because of a worry about work hardening.
All these issues are valid to some degree, but aluminum has plenty of strength for fuel pressure, and has less of an issue with work hardening than SS. I'll leave it to you to consider the odds of a rock hitting your aluminum fuel tube and causing it to leak, but not so hard that a SS line wouldn't leak too. I think those odds are extraordinarily low... but it's not zero.
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