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1990–1997 Mazda MX-5 Miata Fuel System FAQ's

Please read our FAQs page to find out more.

Do I need bigger injectors for bolt‑on NA power?

Not typically for mild NA builds. Turbo/supercharged setups or E85 blends need higher‑flow injectors and a matched pump—size with headroom and tune properly.

Is a flex‑fuel kit worth it on an NA Miata?

Yes—an ethanol content sensor enables dynamic timing and fueling for blends, improving knock resistance and temps when tuned accordingly.

How do I avoid fuel starvation on long sweepers?

Keep the tank above half for track use; consider baffling or a surge tank at higher grip levels and log fuel pressure to verify stability.