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K-Tuned - Female EFI to AN Fittings

K-Tuned - Female EFI to AN Fittings


Category: Fuel System

Regular price $19.99
Regular price Sale price $19.99
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  • Universal
* If you want to measure and confirm what size EFI fitting you have, simply check the line thickness with a 1/4", 5/8 or 5/16" wrench.
 1/4 EFI Fitting
 - 01-15 Civic Firewall (All models)
 - RSX Firewall 

5/16 EFI Fitting
 - 1996-00 Civic Sending Unit 
- K-Series Car Fuel Rail (01-15 Civic / 02-06 RSX / 04-12 TSX)

3/8 EFI Fitting
 - 8th Gen Civic SI Sending Unit
 - RSX Sending Unit
 - Flex Fuel Sensor

On some newer model Honda and Acura vehicles you might notice that Electronic Fuel Injection (EFI) style fittings are being used on several of the fuel system components. Typically these are found a bit more often on returnless fuel systems and more specifically on the fuel rail, fuel feed (firewall) hardline and we've also seen them used on some fuel pump hangers. These special adapter fittings are designed to quickly adapt a male EFI connection to a male 6AN fitting. This makes converting EFI parts to a custom AN fuel system very simple.

The OEM design is held in place with a standard plastic locking clip. We also offer a special design with a thread on locking clip. Both of these adapters use an internal dual o-ring seal to ensure connections are leak free even under high pressures. We have used the 1/4" adapter on RSX and 8th Gen Civic fuel feed (firewall) hardlines and the 5/16" adapter fits all of the stock EFI K-Series fuel rails we have seen so far. 

If you want to measure and confirm what size EFI fitting you have, simply check the line thickness with a 1/4", 5/8 or 5/16" wrench.


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Processing will take about 2 to 3 days before your product ships. If an item is not in stock, you will have an update as to when your item will ship within 24 hours. If you have any questions about shipping make sure to email us at or call our reps today at 732-638-5268.

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When will my product ship out?

Due to the impact of COVID-19 and the high volume of orders, some orders may take longer than usual to process and ship. Processing takes about 2 to 3 days before your order ships. If you order an item that’s on backorder, you will automatically be refunded for that item.

Refunds are subject to a 20% restocking fee. Cancellations are subject to 10% cancellation/processing fee under no exceptions. If you have any questions about shipping make sure to email us at or call our reps today at 1 (844) 442-8118.

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Unless the product is manufactured by Tri-State Motorsports or TSM Race, ALL Warranties go through the Manufacturer directly. Please visit their official website and get in contact with them in regards to your warranty. We will supply you with any invoice or tracking information the manufacturer asks you for.

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