Fuel Pressure In Integra: What's The Standard Range?

The fuel pressure of an Integra is a topic of interest for many car enthusiasts, with some sources stating that the stock fuel pressure should be between 31-36 psi, while others suggest it can go up to 46-48 psi. However, it is important to note that modifying the fuel pressure without proper knowledge can lead to adverse effects on the vehicle's performance and fuel efficiency. Some Integra owners have reported fuel pressures of 60 psi, which is significantly higher than the recommended range. It is always advisable to refer to the manufacturer's recommendations and seek professional advice before making any adjustments to fuel pressure or using aftermarket parts.

Fuel pressure with the vacuum hose disconnected

The fuel pressure regulator is a critical component of a vehicle's fuel system, ensuring the engine receives fuel at the desired pressure and flow rate for optimal performance. It is connected to the intake manifold vacuum via a vacuum hose, which helps maintain the correct fuel pressure and adjust the air-fuel mixture ratio.

When the vacuum hose is disconnected from the fuel pressure regulator, fuel pressure increases. This is because the vacuum normally helps to control and lower the pressure. When it is removed, the pressure rises.

• Engine Hard Starting: The engine may struggle to start due to a lower air-fuel ratio at vehicle starting conditions or when the throttle plate is closed. The rich air-fuel mixture in low fuel demand conditions can also damage engine parts.
• Vehicle Rough Idling: The engine may run rough during idling, with uneven revs, as the air-fuel mixture is affected. The idle RPM may shoot up.
• Check Engine Light: The check engine light may illuminate, indicating the need for attention before other engine parts are damaged.
• Poor Throttle Response: The vehicle may struggle to accelerate as the fuel pressure will be lower than required. Even with a boost condition, the increased intake manifold pressure won't result in a richer air-fuel mixture.

To prevent vacuum hose disconnection, it is recommended to use spring band or worm clamps to secure the hose. Alternatively, a zip tie or cable tie can be used as a temporary measure. It is also important to select the correct size vacuum hose to ensure a reliable seal.

Stock fuel pressure

The stock fuel pressure of an Acura Integra is between 31-36 psi. This can be increased by 10% (to around 39.6 psi) with stock injectors and a stock fuel pump, but increasing the pressure further than this will shorten the lifespan of the injectors and fuel pump.

The stock fuel pressure with the vacuum disconnected is between 40-47 psi.

Some sources state that the stock fuel pressure is 38 psi.

The fuel pressure can be adjusted using an adjustable fuel pressure regulator.

Fuel pressure at idle

It is important to note that fuel pressure that is too high can cause issues. One user reported that their Integra was reading a fuel pressure of 60 psi, which is likely to cause the car to run rich. The stock fuel pressure for their car should have been 38 psi.

Another user reported that their fuel pressure was at 35 psi, which is enough to avoid issues. However, they were trying to track down a problem with high idle.

The fuel pressure can be adjusted using the adjustable fuel pressure regulator. This can be found mounted on the fuel gauge, with a little nut and a long screw that has an Allen key hex hole. Adjusting this will change the fuel pressure.

Fuel pressure regulators

The stock fuel pressure for an Acura Integra is between 31-36 psi. This can be increased to 40-47 psi with the vacuum disconnected.

The UPGR8 fuel pressure regulator bolts directly onto the stock Honda or aftermarket high-volume fuel rail. It has a 1:1 vacuum reference, meaning for every pound of boost on a turbocharged or supercharged application, there is a one-pound rise in fuel pressure. This can be adjusted from a range of 30 psi to the maximum the fuel pump can deliver.

There are a variety of fuel pressure regulators available for the Acura Integra, with some of the most popular options being the GP Sorensen Fuel Pressure Regulator and the Beck Arnley Fuel Pressure Regulator.

Fuel pump

The fuel pump is a vital component of your Acura Integra, ensuring that fuel is delivered from the tank to the engine. A damaged fuel pump can cause jolting or bucking when you accelerate, so it's important to maintain and replace it when necessary.

When it comes to fuel pressure, the stock fuel pressure for an Integra is between 31-36 psi with the vacuum connected, and 40-47 psi with the vacuum disconnected. However, it's important to note that increasing fuel pressure can put strain on the fuel pump and injectors, potentially reducing their lifespan. Unless you have other performance modifications that require richer fuel mixtures, it's generally not recommended to increase the fuel pressure beyond stock levels.

There are a variety of aftermarket fuel pumps available for the Acura Integra, with different specifications and features. When choosing a fuel pump, it's important to consider factors such as flow rate, pressure, and compatibility with your vehicle. Some popular options include:

• Walbro 255lph Fuel Pump & Setup Kit
• Edelbrock part #17937 high-pressure 255 Liter/Hr in-tank fuel pump
• AEM E85 340LPH High Flow In-Tank Fuel Pump
• Delphi Fuel Pump CFD0030
• KEMSO 340LPH High-Performance Fuel Pump

Remember to always refer to your Integra's service manual or seek professional advice for specific instructions and recommendations regarding fuel pressure and fuel pump maintenance or replacement.

Frequently asked questions