Ameer Randolph
The Walbro 485 lph Fuel Pump is one of the highest-flowing single pumps on the market, supporting over 700hp in a Forced Induction application. However, it is known that anything over a 255 fuel pump can overpower the stock fuel pressure regulator in a car with a stock ECU. Therefore, it is important to determine whether the stock fuel pressure regulator in an E36 can handle the Walbro 485 fuel pump.
What You'll Learn
- The stock fuel pressure regulator in an E36 M3 is boost-referenced
- The stock fuel pressure regulator connects to the intake manifold plenum ports
- A Walbro 485 fuel pump is one of the highest-flowing single pumps
- The Walbro 485 pump supports over 700hp in forced induction applications
- The Walbro 485 pump is E85 compatible
The stock fuel pressure regulator in an E36 M3 is boost-referenced
When installing an aftermarket fuel pump, such as the Walbro 485, it is important to consider the fuel pressure regulator. The stock fuel pressure regulator in an E36 M3 may not be able to handle the increased fuel flow rate of an aftermarket pump. In this case, an adjustable fuel pressure regulator can be installed to ensure adequate fuel supply and proper fuel pressure.
It is also important to note that the fuel pressure regulator must be connected to the intake manifold plenum ports. This is because the fuel injectors always see the pressure in the intake manifold, and the fuel pressure regulator must be referenced to this pressure to ensure proper fuel injection. Connecting the fuel pressure regulator to the intake manifold plenum ports can be done using a distribution block, as there may be multiple components that need to be connected to the intake manifold, such as the blow-off valve, wastegate, and boost gauge.
Additionally, when installing an aftermarket fuel pump and fuel pressure regulator, it is important to consider the vacuum lines. The vacuum line from the stock fuel pressure regulator may need to be rerouted or replaced with an aftermarket vacuum block to accommodate the new fuel system. Proper vacuum lines are necessary to ensure the proper functioning of the fuel pressure regulator and the overall fuel system.
Overall, when modifying the fuel system of an E36 M3, it is important to consider the stock fuel pressure regulator and make the necessary adjustments or upgrades to ensure proper fuel pressure, fuel injection, and overall engine performance.
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The stock fuel pressure regulator connects to the intake manifold plenum ports
In the case of a turbocharged system, the stock fuel pressure regulator cannot be attached to the intake due to boost psi, which will blow it off or damage the diaphragm. In this case, it may be necessary to use a vacuum port on the turbo or an aftermarket FPR.
Fuel pressure must climb in line with boost pressure, as the boost inside the intake pressurises the bottom of the injector, creating less differential pressure and reducing the volume of fuel injected. This is something you don't want, as it will also negatively impact atomisation.
The intake manifold plenum ports are the best spot to connect the stock fuel pressure regulator as this is the same pressure that the injectors always see.
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A Walbro 485 fuel pump is one of the highest-flowing single pumps
The Walbro 485 fuel pump is one of the highest-flowing single pumps on the market. It is designed for in-tank applications and is compatible with gasoline, race gas, and ethanol blends up to E99, as well as race gas/ethanol blends. It is also E85 safe.
The Walbro 485 fuel pump is a high-pressure, high-flow performance pump that can support over 700hp in a Forced Induction application. It has a unique design featuring a single impeller with two parallel rows of turbine blades, which results in improved hot fuel flow and minimal noise and current use. This innovative design makes it 20% more efficient than conventional pumps.
The Walbro 485 fuel pump is also known as the F90000274 or the "high-pressure Walbro 450, 465, or 485". It is identical to the F90000267 but has a higher-pressure safety relief valve for high-boost applications. It is able to operate at up to 112 psi total fuel pressure and has an internal check valve for use in staged or non-staged fuel systems.
The pump comes with a fuel-safe sealed Delphi electrical connector and requires a Walbro prefilter on the inlet. It is recommended to fuse each pump at 25A. This pump is not recommended for methanol fuels.
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The Walbro 485 pump supports over 700hp in forced induction applications
The Walbro 485lph Fuel Pump is a high-flowing single pump that can support over 700hp in forced induction applications. It comes with an E36 install kit, which includes a CNC-machined adapter sleeve, a fuel pump strainer, a wiring pigtail, a custom-sized corrugated fuel line, and two clamps. The installation process is straightforward, requiring almost no fabrication. The fuel pump sleeve ensures that the pump sits correctly within the factory sump, and the included nylon butt connectors are UL-approved and gas safe.
This pump is a popular choice for those looking to install an E46 M3 6-speed transmission into their E36, without the need for a custom transmission cross-member. The kit provides a cost-effective solution, as BMW no longer sells the factory 6-speed Euro M3 transmission cross-member in the US.
The Walbro 485 pump is also E85 compatible and can fit various BMW models, including the E36 M3, 325i, 325is, 328i, 328is, and 328ic. It is a reliable and powerful option for those seeking high performance and a seamless installation process.
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The Walbro 485 pump is E85 compatible
The Walbro 485LPH F90000274 E85 Racing Fuel Pump is a high-pressure fuel pump that outperforms all current market in-tank fuel pumps. It is designed for turbocharged applications where a single 255LPH fuel pump is insufficient. The pump features a single impeller with two parallel rows of turbine blades, which results in extremely quiet operation compared to Walbro's previous pump design. The Walbro 485 pump can flow between 15-120psi and the final fuel pressure is determined by the fuel pressure regulator.
The Walbro 485 pump is a popular choice for racing and performance applications, with many customers reporting increased horsepower and performance. It is important to note that this is an aftermarket fuel pump and some modifications may be required for installation. The pump is also available with an installation kit, which includes a CNC-machined adapter sleeve, fuel pump strainer, wiring pigtail, corrugated fuel line, and clamps.
The Walbro 485 fuel pump is a reliable and powerful option for those seeking increased performance and horsepower, especially when using E85 fuel.
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Frequently asked questions
The Walbro 485 lph Fuel Pump with E36 Install Kit is a high-flowing single pump that can support over 700hp in a Forced Induction application. It is E85 compatible and comes with an installation sleeve, a fuel pump strainer, a wiring pigtail, a custom-sized corrugated fuel line, and two hose clamps.
The installation process for the Walbro 485 lph Fuel Pump with E36 Install Kit is relatively straightforward and requires minimal fabrication. First, remove the factory pump and hose from the housing. Install the provided sleeve into the housing, followed by the clamp at the bottom of the sleeve. Then, install the pump from the bottom and tighten the clamp. Finally, install the hose, ensuring it loops like the OEM hose.
It is important to note that the pinch clamps are best for not putting a side load on the plastic barbed ends. Additionally, for OBDII cars (1996-1999), the regulator will require additional work to install as you must bypass or disable the 3-way fuel valve located underneath the car.
The Walbro 450/485 Fuel Pump can overpower the stock fuel pressure regulator and run high fuel pressure. It also requires upgraded wiring as the stock wiring is not designed to handle the power draw of this pump.
