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1999–2005 Mazda MX-5 Miata Fuel System FAQ's

Please read our FAQs page to find out more.

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

Not for mild NA builds. Turbo/supercharger or E85 blends require higher‑flow injectors and a matched pump—size with headroom and tune correctly.

Is a flex‑fuel kit worth it on the NB?

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

How do I avoid fuel starvation in long sweepers?

Keep the tank above half on track; baffling or a surge tank helps at higher grip. Log fuel pressure to confirm stability.