Sylvie Willis
Running a single fuel line on an LSX S10 engine requires careful consideration of the fuel system. The fuel pump, lines, filter, and regulator all play a crucial role in ensuring the engine receives the correct fuel supply. When choosing a fuel pump, options include the stock pump, an external pump such as the Bosch 044 or Walbro 255, or a higher-capacity pump for boosted applications. The fuel lines should be selected based on the type of fuel and application, with specific standards like SAE30R10 and SAE30R9 for submerged and pressurized uses, respectively. Adapters and fittings are also necessary to connect the fuel lines to the fuel rail and tank, and the regulator should be adjustable to maintain the desired fuel pressure.
| Characteristics | Values |
|---|---|
| Fuel line | -6AN feed hose |
| Fuel filter | Corvette filter/regulator, Napa brand S10 filter, ACDelco GF845, FIL3100 Napa |
| Fuel pump | Stock 4.3 v6 pump, Holley bypass regulator, Racetronix 340 pump, Bosch 044 external pump, Walbro 255 pump |
| Fuel tank | Stock EFI fuel tank, custom 16-gallon fuel cell |
| Hose | Russell Stainless hose, 1/2" and 5/8" heater hose |
| Fittings | Russell adapter fittings, nylon fuel line with push-on fitting, -6AN fittings |
| Adapter | Required for -AN fitting supplied with fuel pump |
| Return line | Stock feed line |
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What You'll Learn
LSx fuel system swap
There are a few different options for the fuel line itself. Some people choose to use steel tubing for the hard lines and Russell Stainless hose for the rubber lines. Others prefer to use a complete fuel swap kit, which includes all the necessary fittings and hoses to connect the fuel pump to the engine. These kits are designed for specific vehicles, so it's important to choose the right one for your car or truck.
In addition to the fuel line, you will also need to consider the fuel pump and regulator. Some people choose to use a stock pump, while others opt for an aftermarket option such as the Walbro 255 or 340, or the Bosch 044 external pump. The regulator can be a simple Holley bypass regulator or an adjustable one, depending on your preferences and the specific requirements of your vehicle.
Finally, you will need to make sure that you are using the correct fuel line to resist the Ethanol-containing fuel blends that are common today. For any submerged applications, the line should meet SAE30R10 standards, while for other applications, including pressurized use, a hose that meets SAE 30R9 standards is recommended.
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LSx fuel pump options
When choosing a fuel pump, it's important to consider factors such as the engine's fuel flow requirements, fuel pump placement (internal or external), and compatibility with your fuel lines and regulators. High-performance engines may require pumps with higher flow rates.
There are a variety of fuel pump options available for LSx swaps and fuel injection installs. It is recommended to use in-tank fuel pumps as they are considerably quieter, with the sound they produce being muffled by the fuel and the tank.
Some popular options for fuel pumps include:
- Walbro GSL-392 In-line fuel pump – the most common choice for factory LS swaps up to mildly modified engines. It features 255L of flow and is based on the OEM design for the Corvette.
- Walbro GCA-758 In-tank fuel pump – a widely universal in-tank design based on a GM sending unit design.
- Walbro 255-Lph internal fuel pump – a high-performance option that can be used internally or externally.
- Universal in-tank fuel pump module for non-EFI tanks – another option from Walbro that offers a universal fit.
- Bosch 044 external pump – an external pump option that can be used with a fuel cell or by welding a sump onto the stock tank.
It is important to use the correct fuel line to resist the Ethanol-containing fuel blends. For any submerged applications, make sure the line meets SAE30R10, and for other applications, including pressurized use, a hose that meets SAE 30R9.
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LSx fuel line and fittings
When it comes to LSx fuel lines and fittings, there are a few key considerations and options to be aware of. Firstly, it is important to use the correct fuel line to resist the Ethanol-containing fuel blends that are commonly used today. For any submerged applications, ensure the fuel line meets SAE30R10 standards, and for other applications, including pressurised fuel lines, a hose that meets SAE 30R9 standards should be used.
There are a variety of fuel line kits available for LS-series engine swaps, which include the necessary fittings and hoses to connect the fuel pump to a fuel-injected engine. These kits are designed for a range of vehicles, including muscle cars, street rods, and off-road vehicles. Some kits offer a return-style setup, which eliminates the FPR and adds an additional fuel line and -AN fittings from the rail to the tank. Depending on the fuel pump, an adapter for the -AN fitting may be required.
When dealing with cutting and installing fittings, it is recommended to seek guidance from online sources such as YouTube. Additionally, specific fittings known as 'Saginaw' fittings are used to connect to stock 16mm and 14mm hardlines, and can be sourced from various suppliers.
For those seeking to perform an LSx fuel system swap, there are a few options to consider. One option is to use a Corvette fuel filter/regulator with a 1994 S-10 Blazer fuel sending unit, which requires adapters to convert the metric o-ring fitting to an AN fitting for the stainless braided hose. Another option is to use a Walbro 255 external pump with mounting hardware, which can supply sufficient fuel for a 5.3 engine using the Corvette filter.
In terms of specific fittings, the ICT Billet Quick Connect Fuel Rail Line Adapter Fitting LS LS1 LS3-6AN is a popular choice, offering high-quality American-made parts that simplify and enhance LS and LT swaps. This adapter is designed to convert or connect factory hard fuel lines to AN-type fittings, and it is recommended to ensure that any plastic locking clips are fully removed to prevent issues under pressure.
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LSx fuel swap kits
When considering a fuel swap kit, it is important to prioritize using the correct fuel line to resist the Ethanol-containing fuel blends. For submerged applications, ensure the fuel line meets SAE30R10 standards, and for other applications, including pressurized use, a hose that meets SAE 30R9 standards is recommended. Additionally, some kits offer the option to run a return-style setup, which eliminates the FPR and adds an additional fuel line and fittings from the rail to the tank.
There are various manufacturers offering LSx fuel swap kits, such as LSx Everything, Sikky Manufacturing, and Hot Rod Fuel Hose by One Guy Garage. These kits are designed for specific vehicle models and years, so it is important to select the appropriate kit for your vehicle. For example, LSx Everything offers a kit for 1964-1972 GM 1/2 ton 2-wheel-drive trucks, while Hot Rod Fuel Hose provides kits for a range of LS engines, allowing you to perform your LS engine swap into any vehicle.
When performing an LSx fuel swap, it is important to consider the fuel pump. Some stock fuel pumps may not be adequate for the task, and an upgrade to an external pump, such as the Bosch 044 or Walbro 255, may be necessary. Additionally, the use of a fuel filter/regulator, such as the Corvette filter/regulator, is an option that requires adapters for the fittings.
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LSx radiator hose
When it comes to LSx radiator hoses, there are a few options and factors to consider. For those using the LS 5.3-liter truck water pump with the differently angled discharge pipe, there are a few choices for the upper radiator hose, but the lower hose choice is more straightforward. It's worth noting that most hoses will require some trimming on the ends to eliminate kinking and ensure a precise fit.
For the upper radiator hose, options include the Gates 22493, which requires trimming, and the Dayco 71428, which needs to be trimmed more extensively. Rubber hoses are generally preferred over convoluted chrome ones as they look better and can absorb vibration.
For a 1967 Malibu with a 6.0 L96 engine and BRP hotrods engine/tranny mount, the Griffin LS swap radiator (part # GRI-CU-00009-LS) is a good choice. The upper radiator hose has a 1.25" opening on both the rad and engine sides, while the bottom hose has a 1.5" opening on both sides. The Gates radiator hose part # 22358 works well for the upper radiator hose with trimming, and part # 22437 is suitable for the lower radiator hose, also with trimming.
Additionally, the LOJ Conversions LSx Swap Radiator Hoses are designed for use with the LOJ 350Z and G35 LS Swap Radiator. This kit includes upper and lower radiator hoses, a steam vent hose, and the necessary hose clamps. These hoses are intended for use with an LSA-style water pump and will only work with the LOJ Swap Radiator.
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Frequently asked questions
You can use a dual tank fuel line kit for a 58 PSI EFI engine. This kit includes 25 feet of line and all the fittings you need for your LS engine swap using fuel pumps and two tanks.
You can use a Bosch 044 external pump or a Walbro 255 pump.
You can use a Napa brand S10 filter or a Vette filter.
You can use a Holley bypass regulator or an Aeromotive regulator.
You can use a stock tank or build a new fuel tank behind the axle.
