Fuel Systems

Fuel Systems: Feed the Engine Enough to Match Your Build

A fuel system's job is simple to state and hard to get right: move enough clean fuel from the tank to the injectors at stable pressure, no matter how hard the engine is pulling. When you add power - boost, a bigger cam, more injector - the stock delivery side runs out of headroom before the engine does. The fuel systems on this page cover that gap, from complete pump-and-regulator kits to fuel/air separation systems that pull air and water out of diesel before it reaches the injection pump. Fit one when your existing setup can't keep rail pressure steady under load, or when you're plumbing a swap or in-tank hanger from scratch.

What ThreePiece stocks

There are 15 fuel systems in stock here across 3 brands: Aeromotive (8 of the sample), Radium Engineering (5) and AirDog (2). Current prices run from $47 to $3,490, which is the live range on what's in stock rather than a standing offer. That spread reflects real differences in scope - a single filler or filter component sits at the low end, while a complete Aeromotive A1000 system with tank sits near the top, like the A1000 system for the 86-95 Mustang 5.0L and the A1000 Stealth system with tank.

Coverage in the product data spans Ford, Chevrolet, Dodge and BMW, with vehicles including the Ford Mustang, Chevrolet Camaro, Chevrolet Silverado and BMW 3 Series across model years from 1986 to 2018. Diesel owners have the AirDog II-5G for the 89-93 Dodge 12V 5.9L Cummins and the AirDog II-5G for the 11-14 Chevrolet 6.6L Duramax.

How to choose

Start with what problem you're solving. If you need a turnkey delivery upgrade on a gas car, a complete Aeromotive system saves you sourcing a pump, regulator and lines separately - but it's the biggest spend. If you're building an in-tank hanger or need clean plumbing for a swap, Radium Engineering parts are more modular, like the BMW E36/E46 fuel hanger plumbing kit or the remote-mount swing valve filler. Diesel trucks are a different job entirely - the AirDog separation systems address air and water in the fuel, not just volume. Match the kit to your engine and your goal, not just to the highest number.

What else you'll need

Most installs need supporting hardware. Look at Fuel Pumps if your chosen system doesn't include one, and plan the plumbing with Fittings and Adapters to tie everything to your existing lines. While you're under the car, it's worth checking Oil Filters and other service items. All of these sit under the broader Engine Components section.

Fitment and ordering

Only some listings carry full fitment data, so confirm your year, make and model before you buy. Call the team for fitment help at 813-535-5801 or reach out through contact us. Every order ships free, and Affirm and Katapult financing is available on checkout.

Fuel Systems: Feed the Engine Enough to Match Your Build

A fuel system's job is simple to state and hard to get right: move enough clean fuel from the tank to the injectors at stable pressure, no matter how hard the engine is pulling. When you add power - boost, a bigger cam, more injector - the stock delivery side runs out of headroom before the engine does. The fuel systems on this page cover that gap, from complete pump-and-regulator kits to fuel/air separation systems that pull air and water out of diesel before it reaches the injection pump. Fit one when your existing setup can't keep rail pressure steady under load, or when you're plumbing a swap or in-tank hanger from scratch.

What ThreePiece stocks

There are 15 fuel systems in stock here across 3 brands: Aeromotive (8 of the sample), Radium Engineering (5) and AirDog (2). Current prices run from $47 to $3,490, which is the live range on what's in stock rather than a standing offer. That spread reflects real differences in scope - a single filler or filter component sits at the low end, while a complete Aeromotive A1000 system with tank sits near the top, like the A1000 system for the 86-95 Mustang 5.0L and the A1000 Stealth system with tank.

Coverage in the product data spans Ford, Chevrolet, Dodge and BMW, with vehicles including the Ford Mustang, Chevrolet Camaro, Chevrolet Silverado and BMW 3 Series across model years from 1986 to 2018. Diesel owners have the AirDog II-5G for the 89-93 Dodge 12V 5.9L Cummins and the AirDog II-5G for the 11-14 Chevrolet 6.6L Duramax.

How to choose

Start with what problem you're solving. If you need a turnkey delivery upgrade on a gas car, a complete Aeromotive system saves you sourcing a pump, regulator and lines separately - but it's the biggest spend. If you're building an in-tank hanger or need clean plumbing for a swap, Radium Engineering parts are more modular, like the BMW E36/E46 fuel hanger plumbing kit or the remote-mount swing valve filler. Diesel trucks are a different job entirely - the AirDog separation systems address air and water in the fuel, not just volume. Match the kit to your engine and your goal, not just to the highest number.

What else you'll need

Most installs need supporting hardware. Look at Fuel Pumps if your chosen system doesn't include one, and plan the plumbing with Fittings and Adapters to tie everything to your existing lines. While you're under the car, it's worth checking Oil Filters and other service items. All of these sit under the broader Engine Components section.

Fitment and ordering

Only some listings carry full fitment data, so confirm your year, make and model before you buy. Call the team for fitment help at 813-535-5801 or reach out through contact us. Every order ships free, and Affirm and Katapult financing is available on checkout.