Relocating Fuel Inlet: A Guide For Fitech Efi Systems

Changing the fuel inlet location on a Fitech fuel injection system is a relatively simple process. The Fitech throttle body fuel injection systems are designed to be easy to install and use, with clearly labelled wiring harnesses and only a few sensors that need to be installed. The fuel inlet location can be changed by following these steps:

- Remove the original fuel inlet fitting from the throttle body.

- Install the new fuel inlet fitting in the desired location on the throttle body.

- Connect the fuel lines to the new fuel inlet fitting.

- Ensure that the fuel lines are securely attached and there are no leaks.

- Start the engine and check for any fuel leaks or issues with the new fuel inlet location.

Fuel inlet location change and fuel dripping

The fuel inlet, also known as the fuel filler neck or fuel tank inlet, is the opening through which you insert the fuel nozzle to fill up your vehicle's fuel tank. It is usually located on the side or rear of the car, behind a small door or flap. When changing the fuel inlet location, it is important to be aware of potential issues with the fuel system, as this can lead to fuel dripping or leakage.

One common issue that may cause the "Check Fuel Fill Inlet" warning is a low or empty gas tank. This warning serves as a reminder to refuel your vehicle and prevent the fuel level from dropping too low, which could damage the fuel system components. If the fuel tank is empty, refuel your vehicle as soon as possible to avoid any further complications.

Another possible reason for the warning is a problem with the gas flow from the fuel pump to the gas tank. This could be due to a clogged or obstructed fuel filler neck, a malfunctioning fuel cap, or an issue with the fuel system components that control fuel flow. An obstruction in the fuel filler neck, such as debris, ice, or other foreign objects, can impede the smooth flow of fuel during refuelling and cause fuel dripping or leakage.

To address these issues, it is important to regularly inspect and maintain the fuel fill inlet. Ensure that the inlet is clean and free from any debris or obstructions that could interfere with the fueling process. Check the fuel cap for any signs of wear or damage, and ensure it is properly aligned and securely tightened. If the fuel cap is loose, tighten it until you hear a click to create a proper seal. If the fuel cap is damaged or missing, replace it with a compatible one for your vehicle's make and model.

In some cases, the fuel filter may need to be replaced. The fuel filter is designed to remove particles and contaminants from the fuel before they enter the fuel injection system. Over time, debris, dirt, and contaminants can accumulate in the fuel filter, restricting the flow of fuel and triggering the "Check Fuel Fill Inlet" warning. Replacing the clogged fuel filter can help restore normal fuel flow and resolve the warning.

If you encounter the "Check Fuel Fill Inlet" warning, it is recommended to consult a qualified mechanic or technician to diagnose and fix the problem. They have the expertise and tools to identify the specific cause and take appropriate measures for repair.

Tuning tips and ideas

Firstly, it is important to note that the initial setup can be done using the unique FiTech controller. After inputting some basic values, the Advanced Self Tuning feature will make any necessary adjustments as the vehicle is driven. The controller can also be used to display gauges for monitoring or for advanced tuning options.

For those who want to further tune their systems, there are a few parameters that can be adjusted. One user reported that increasing the IAC loop down to 20 helped resume normal idle after a flare-up. Another user recommended adjusting the Decel open IAC to somewhere between -10 and -30 to reduce exhaust popping on deceleration.

Other parameters that can be adjusted include the idle AFR, cruising AFR, and WOT enrichment settings. The idle AFR can be adjusted to improve idle quality and take-off from an idle. The cruising AFR can be adjusted depending on the engine's needs and desired fuel economy. The WOT enrichment settings can be tuned to adjust the desired fueling for acceleration under part throttle or wide-open throttle.

It is also important to ensure that the fuel pressure is sufficient. One user reported that they had to adjust the PWM for the fuel pump to maintain adequate pressure at idle.

Additionally, it may be necessary to adjust the cam setting. One user reported that they had to change from cam setting 3 to 4 to get enough VE for their engine.

Finally, for those with automatic transmissions, it is important to note that a TPS Breakout Harness from Casper's Electronics is required to tap into the TPS for a trans controller.

Fuel injection vs carburetor

Fuel injection and carburetor are two methods of delivering fuel to an engine's cylinders. The struggle between these two rivals has been ongoing in the field of automotive engineering, with each system having its own unique concept and workings that significantly impact vehicle design and operation.

Fuel Injection

Fuel injection is a key innovation in automobiles that has revolutionized how engines work by bringing about increased economy, higher performance, and lower emissions. It replaces conventional carburetor systems, delivering fuel to the engine cylinders with more control and precision. The basic idea behind fuel injection is to precisely measure and time the injection of gasoline into the intake manifold or combustion chamber, allowing for the best air-fuel ratios, which optimize combustion and increase power output and fuel economy.

Fuel injection systems come in various forms, including electronic fuel injection (EFI), which has become the norm. EFI uses sensors to monitor engine characteristics and modify the fuel supply accordingly. This real-time adaptation improves performance and helps cut emissions.

One of the main advantages of fuel injection is its ability to carefully regulate the fuel-air mixture, resulting in better fuel combustion and less waste. This leads to increased fuel efficiency and helps reduce harmful exhaust emissions. Additionally, fuel injection technologies help engines run more smoothly, wear down less quickly, and last longer.

Fuel injection also provides a faster throttle response, smoother acceleration, and higher power output compared to carbureted engines. This is crucial for modern cars, which must balance strength, effectiveness, and environmental responsibility.

Carburetor

The carburetor played a crucial role in the development of internal combustion engines in the past. However, technological developments have mostly replaced it with more accurate and economical substitutes such as fuel injection systems.

A carburetor mixes air and fuel in a regulated manner before sending the mixture to the engine's cylinders. It uses a system of calibrated jets and passageways to draw in the optimum quantity of fuel using the Bernoulli principle and engine vacuum.

Despite their straightforward construction, carburetors often have trouble maintaining constant air-fuel ratios, especially in situations with temperature or altitude variations. This results in decreased engine efficiency, variable performance, and higher emissions.

One of the main drawbacks of carburetors is the "carburetor lag", which causes a delay in the fuel delivery process when the throttle is rapidly opened. Additionally, carburetors may find it challenging to maintain the correct air-fuel ratio under varying driving conditions, leading to inefficiencies and increased emissions.

In contemporary cars, fuel injection systems have essentially replaced carburetors. Fuel injection provides better control over the air-fuel mixture, real-time adaptability to changing environmental circumstances, and improved performance, fuel efficiency, and emissions reduction. On the other hand, carburetors offer simplicity, cost-effectiveness, and ease of repair, making them suitable for antique or classic cars where authenticity is highly valued.

The choice between fuel injection and carburetors depends on the user's preferences and usage habits. While fuel injection provides greater power delivery, lower vibrations, and higher fuel efficiency, a carburetor engine may be more appropriate for those who prioritize simplicity, cost-effectiveness, and ease of repair.

Installation process

The installation process for a FiTech fuel system is relatively straightforward, especially when compared to older, more complicated fuel injection systems.

First, you'll need to select the right system for your vehicle. FiTech offers a range of throttle body systems, port injection systems, and LS induction systems. Choose a system that matches your engine's horsepower, power adders (e.g. nitrous or superchargers), vehicle type, and whether you need ignition timing control.

Once you have your system, the installation process is similar to swapping out a carburetor. The wiring harness is clearly labeled, and you only need to install two sensors: the CTS (coolant temperature sensor) in the intake manifold and the O2 sensor in the exhaust system. The ECU (electronic control unit), IAC (idle air control), TPS (throttle position sensor), MAP (manifold absolute pressure), and fuel pressure regulator are all incorporated into the throttle body.

For the initial setup, use the included handheld controller. Input a few simple values, and the Advanced Self-Tuning feature will make any necessary adjustments. After this, you can use the controller to display easy-to-read gauges for monitoring or make advanced tuning adjustments.

If you're installing a FiTech system in a vehicle with an automatic transmission, be aware that you may need to tap into the TPS for a trans controller. If this is the case, order a TPS Breakout Harness from Casper's Electronics or one of FiTech's authorized distributors.

In terms of the fuel supply, FiTech offers four different fuel delivery options: inline fuel pump, Fuel Command Center, Hy-Fuel, or G-Surge. The Fuel Command Center is a self-contained unit with a fuel tank and a submerged 340 L/PH pump. The engine's original carbureted fuel pump fills the tank, and a float assembly automatically shuts off the fuel flow when the correct fuel level is reached.

That covers the basics of installing a FiTech fuel system. With its self-tuning capabilities and clear instructions, FiTech has made the process straightforward for vehicle enthusiasts.

Fuel supply systems

One popular option for Fitech EFI systems is the Fuel Command Center, which is a self-contained unit that includes a fuel tank and a high-pressure pump. The Fuel Command Center is designed to supply fuel to the injection system, and it can be a convenient choice for those who want a simple and integrated solution. The engine's original carbureted fuel pump fills the tank, and a float assembly automatically shuts off the fuel flow when the correct fuel level is reached. This option is ideal for those who want a maintenance-free and reliable fuel supply system.

Another option for Fitech EFI systems is an in-tank electric fuel pump. This option requires modifying the existing fuel tank to accommodate the electric fuel pump, which can be a more complex installation process. However, in-tank electric fuel pumps offer several advantages, including improved fuel delivery and the ability to support higher horsepower applications. They can also be used as a return or returnless system, providing flexibility in the fuel delivery setup.

Additionally, Fitech offers external inline fuel pumps that are mounted to the frame of the vehicle. These pumps are capable of supporting up to 600 horsepower and are a good choice for those who want a simple and cost-effective solution. However, it is important to note that these pumps require a return line to the fuel tank, which can add complexity to the installation process.

Ultimately, the choice of fuel supply system depends on the specific requirements of the engine and the vehicle. Each option has its own advantages and considerations, and it is important to carefully review the fuel delivery options offered by Fitech to determine the best solution for your needs. By selecting the appropriate fuel supply system, you can ensure that your Fitech fuel injection setup performs optimally and delivers the desired performance and efficiency.

Frequently asked questions