Replacing a standard gas cap is usually inexpensive, typically ranging from about $5 to $40 depending on whether you choose a cheap aftermarket part or the original equipment manufacturer (OEM) cap. Cars with capless fueling don’t use a cap to replace, but related fuel-system repairs can be more costly.
The price you pay depends on the vehicle, the part’s brand, and where you shop. If you’ve lost a cap, you can often find a universal or aftermarket option at a lower price, though some vehicles require the OEM part for compatibility. For capless fueling systems, you won’t replace a cap, but if there’s a fault in the filler neck or EVAP system, repairs can be significantly more expensive.
Gas cap options and typical costs
Prices vary by type and retailer. Here is a quick guide to typical costs you might encounter when replacing a standard gas cap.
- Basic screw-on gas cap (non-locking) — typically $5–$15 for aftermarket parts; OEM caps from the dealer may run about $15–$40.
- Locking gas cap — generally $25–$60, depending on the make and whether the cap is dealer-installed or aftermarket.
- Premium or model-specific OEM caps — often $30–$60, particularly for luxury or specialty brands where the cap is tied to the vehicle’s emissions system.
In practical terms, most people paying for a standard gas cap will spend well under $40, and often much less when choosing an aftermarket option. If you need the exact OEM part for a precise fit, expect the higher end of the range.
Capless fueling: what to know
Many newer vehicles use capless fueling, which means there is no replaceable gas cap. If a component in the fuel-filler neck or evap system fails, the repair costs won’t be about a cap but about the associated hardware and diagnostics.
When capless systems require service
Repair work on capless fueling or the evap system can range from a few hundred dollars to more than a thousand, depending on the vehicle, the specific component replaced (filler neck, purge valve, or evap canister), and the labor required. Always obtain a quote that itemizes parts and labor before authorizing extensive repairs.
Summary
For most drivers, replacing a standard gas cap is a low-cost item, typically between $5 and $40. Locking caps and model-specific OEM parts push the ceiling higher, while capless fueling shifts potential costs toward EVAP or filler-neck components rather than a cap replacement. If you’re unsure of your car’s fueling system, check your owner’s manual or ask a trusted mechanic to confirm whether you have a traditional cap or a capless system and what the appropriate part replacement would be.