Fuel Fittings

Select your vehicle to see Fuel Fittings that fit

Fuel Fittings: the joints that hold your fuel system together

Fuel fittings are the connectors that link pumps, filters, rails, regulators and hose into one sealed circuit. When you swap to a bigger pump, run flex fuel, or build a return-style system, the factory quick-connects and hard lines rarely match your new hardware. That's when you reach for the right fittings: AN-threaded adapters, Y-blocks that split one feed into two, junction blocks, and banjo fittings that turn a tight angle where a straight fitting won't fit. Get the thread size, the seal type and the flow path right, and the joint holds pressure without weeping. Get it wrong and you chase leaks all afternoon.

What ThreePiece stocks

This category currently shows 40 products from 8 brands, with current in-stock prices running from $24 to $112 (that's the live range, not a promise). Aeromotive leads the count with 14 items, followed by DeatschWerks at 11 and Radium Engineering at 8, plus Fragola, Walbro, Haltech, COBB and Russell filling out the rest. Concrete examples: the Aeromotive AN-12 to 2x AN-10 Y-Block at the top of the range, the smaller AN-10 to 2x AN-08 Y-Block, the Haltech 3/8 GM spring-lock to -6AN flex fuel fittings (pair), and the Russell 3AN front male junction block.

How to choose

Start with the thread and size you actually need. Y-blocks like the Aeromotive pair let you split a single feed into two lines, so match the inlet AN size to your pump and the outlet sizes to your rails. Banjo fittings solve clearance: the two Radium 10AN swivel banjos differ only in press-fit depth, 18.0mm versus the 13.5mm version, so measure your port before you order. If you're adapting a factory quick-connect, the Haltech pair converts a GM spring-lock straight to -6AN male. Cheaper single fittings sit near the $24 floor; multi-port blocks and swivel banjos carry the higher prices because they do more.

What else you need

Fittings are one piece of the plumbing. Browse the broader Fittings range (634 items) and the Adapters category (699 items) for thread conversions and hose ends. If you're upsizing supply, pair these with a pump from Fuel Pumps. When you're doing a full teardown, a Gasket Kit keeps you from reusing tired seals. All of these live under the Engine Components section.

Fitment and ordering

Fitment data in this category is limited: only one product lists specific vehicle fitment, tied to Subaru WRX and STI (2004-2017). Most fittings are chosen by thread size and AN spec rather than by vehicle, so match the hardware you're connecting. If you're unsure, call fitment help at 813-535-5801 or reach us through contact. Every order ships free, and Affirm financing is available at checkout.

Fuel Fittings: the joints that hold your fuel system together

Fuel fittings are the connectors that link pumps, filters, rails, regulators and hose into one sealed circuit. When you swap to a bigger pump, run flex fuel, or build a return-style system, the factory quick-connects and hard lines rarely match your new hardware. That's when you reach for the right fittings: AN-threaded adapters, Y-blocks that split one feed into two, junction blocks, and banjo fittings that turn a tight angle where a straight fitting won't fit. Get the thread size, the seal type and the flow path right, and the joint holds pressure without weeping. Get it wrong and you chase leaks all afternoon.

What ThreePiece stocks

This category currently shows 40 products from 8 brands, with current in-stock prices running from $24 to $112 (that's the live range, not a promise). Aeromotive leads the count with 14 items, followed by DeatschWerks at 11 and Radium Engineering at 8, plus Fragola, Walbro, Haltech, COBB and Russell filling out the rest. Concrete examples: the Aeromotive AN-12 to 2x AN-10 Y-Block at the top of the range, the smaller AN-10 to 2x AN-08 Y-Block, the Haltech 3/8 GM spring-lock to -6AN flex fuel fittings (pair), and the Russell 3AN front male junction block.

How to choose

Start with the thread and size you actually need. Y-blocks like the Aeromotive pair let you split a single feed into two lines, so match the inlet AN size to your pump and the outlet sizes to your rails. Banjo fittings solve clearance: the two Radium 10AN swivel banjos differ only in press-fit depth, 18.0mm versus the 13.5mm version, so measure your port before you order. If you're adapting a factory quick-connect, the Haltech pair converts a GM spring-lock straight to -6AN male. Cheaper single fittings sit near the $24 floor; multi-port blocks and swivel banjos carry the higher prices because they do more.

What else you need

Fittings are one piece of the plumbing. Browse the broader Fittings range (634 items) and the Adapters category (699 items) for thread conversions and hose ends. If you're upsizing supply, pair these with a pump from Fuel Pumps. When you're doing a full teardown, a Gasket Kit keeps you from reusing tired seals. All of these live under the Engine Components section.

Fitment and ordering

Fitment data in this category is limited: only one product lists specific vehicle fitment, tied to Subaru WRX and STI (2004-2017). Most fittings are chosen by thread size and AN spec rather than by vehicle, so match the hardware you're connecting. If you're unsure, call fitment help at 813-535-5801 or reach us through contact. Every order ships free, and Affirm financing is available at checkout.