Sylvie Willis
The AE86 is a legendary car with a passionate following. Owners of this iconic Toyota Corolla are often faced with the task of replacing the fuel pump, a common issue due to the age of the vehicle. The process of changing the fuel pump can vary depending on the model of AE86 and the type of fuel pump being installed. Some models, such as the 4AC, do not have an electric fuel pump from the factory, so owners may need to consider an external pump or an upgrade to a GTS tank. When replacing the fuel pump, it is also recommended to replace the fuel pump bracket, as these often become rusty and damaged after years of use.
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What You'll Learn
Check for debris in the gas tank
To check for debris in the gas tank of your AE86, you will need to remove the gas tank from your vehicle. This will allow you to inspect the tank for any debris and, if necessary, clean it out.
Before removing the gas tank, ensure that you have the necessary tools and safety equipment, including gloves and eye protection. It is also recommended to work in a well-ventilated area to avoid inhaling fumes. Once you have safely removed the gas tank, you can begin the inspection process.
Start by visually inspecting the tank for any signs of debris or contamination. Look for any sediment, corrosion, or deterioration of the tank lining. If the tank is made of metal, you can use a magnet to detect any metal shavings or particles that may be present. If you find debris, you may need to clean the tank. This can be done by rinsing and sloshing a small amount of gasoline around the tank to remove any remaining debris. Ensure that you dispose of the contaminated gasoline safely and responsibly.
Additionally, check the fuel pump for any debris that may have accumulated. The fuel pump may have a "sock" or filter attached, which can be inspected and cleaned if necessary. If you notice any damage or excessive wear on the fuel pump, it may be advisable to replace it.
Finally, before reinstalling the gas tank, take preventive measures to avoid future debris issues. Consider installing an additional inline filter in the fuel lines to keep the gasoline clean and free of contaminants. Regular maintenance and fuel filter replacements can also help maintain the cleanliness of your fuel system.
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Replace the old rubber hose
When replacing the fuel pump on your AE86, it is always a good idea to replace the old rubber hose. This is a safety measure and will prevent fuel fumes from entering the cabin.
To do this, first, locate the rubber hose. It is attached to the fuel pump hard line above the tank. You will need to remove the fuel tank to access this part. The hose is designed to be flexible so that you can remove the tank. Once you have located the hose, you will need to cut it off, as it will likely be rusty and in poor condition. Be sure to cut carefully to avoid damaging any other components.
Next, you will need to source a replacement hose. This should be a regular piece of rubber fuel line, which you can purchase from an auto parts store or online. Ensure that you select a hose that is the correct length and diameter to fit your AE86. It is also important to use a proper pressure-rated hose for this purpose.
When you have the new hose, install it in the same location as the old one, using two clips to secure it in place. Make sure that the hose is not twisted or kinked, as this could restrict fuel flow. You may also want to consider replacing the filter and adding an extra inline filter in the fuel lines to keep the gas clean.
By following these steps, you can ensure that your AE86's fuel system is safe and well-maintained.
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Install an extra inline filter in the fuel lines
To install an extra inline filter in the fuel lines of your AE86, you will need to purchase an inline fuel filter, a short length of hose, clamps, and any other necessary fittings.
First, decide where you want to place the new filter. It is recommended to put it under the car, rather than in the engine compartment, as this keeps it out of sight and ensures that the lines don't pull out or crack. You can also consider placing it near the gas tank, to filter any contaminants as early in the fuel system as possible.
Once you have decided on a location, you will need to splice the filter into the fuel line. Cut the fuel line and insert the new filter, using the short length of hose and clamps to secure it in place. Ensure that you use hard lines all the way, rather than rubber hoses, and that the filter is installed between the fuel pump and the carburettor.
Finally, check for leaks and ensure that the filter is secure and functioning properly.
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Check for a broken wire in the loom
To check for a broken wire in the loom of your AE86, you will need to perform a thorough inspection of the wiring. Here is a step-by-step guide to help you with the process:
Step 1: Locate the Wire Loom
Start by locating the wire loom in your AE86. It is likely to be bundled together inside flexible plastic conduit, hidden behind trim panels, carpeting, or upholstery. The loom may run through tight spots and is subject to constant movement, which can cause wire breaks or shorts.
Step 2: Identify the Problem
If you are experiencing issues with specific vehicle components, such as the fuel pump not priming, identify the wires associated with those components. In the case of the fuel pump, refer to the wiring diagram to find shared points in the circuit and narrow down the areas for inspection.
Step 3: Perform a Visual Inspection
Carefully remove any protective coverings or trim panels to expose the wires in the loom. Visually inspect each wire for any signs of damage, such as worn or exposed copper wiring. Look for spots where the plastic covering may have deteriorated, as these areas are prone to breakage.
Step 4: Check for Voltage
Using a multimeter or a voltage tester pen, check for voltage in the wires. Turn on the switch powering the accessory and touch the multimeter's negative lead to any good ground. Then, place the positive lead on the positive terminal or wire leading to the non-working accessory to see if there is voltage flowing.
Step 5: Test for Continuity
If there is no voltage, the problem may lie in a faulty wiring harness. Test this length of the wiring harness for continuity, which will indicate whether electricity is able to flow through the wiring. Place one probe of the multimeter in one socket of the connector and trace the wire to the other end, attaching the other probe there. If the multimeter reading is infinite ohms or OL (out of limits), the circuit is electrically open, and the wire is likely broken.
Step 6: Identify the Broken Wire
By performing the voltage and continuity tests, you should be able to identify the specific wire that is broken. In the case of the AE86 fuel pump issue, you may need to refer to the wiring diagram and perform additional tests to confirm the broken wire.
Step 7: Repair or Replace the Wire
Once you have identified the broken wire, you can repair it by soldering or splicing in a new wire. Ensure that you add protection to the connection point, such as electrical tape or a wire protection tube. Alternatively, you may consider replacing the entire section of the wiring harness if multiple wires are damaged.
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Replace the fuel pump bracket
To replace the fuel pump bracket on your AE86, follow these steps:
First, it is important to understand the purpose of the fuel pump bracket. The bracket is crucial as it securely mounts the fuel pump, ensuring consistent fuel pressure and delivery. It also minimizes vibration and movement, reducing potential issues with fuel delivery and preventing engine damage.
Next, assess the condition of your current fuel pump bracket. Over time, these brackets can become rusty and deteriorate due to prolonged exposure to fuel. If your AE86 is over 35 years old, it is highly recommended to replace the bracket to ensure optimal performance and fuel system integrity.
Now, let's discuss the replacement process:
- Purchase a new fuel pump bracket: You can find OEM (Original Equipment Manufacturer) brackets designed specifically for the AE86, ensuring a perfect fit and superior quality. These brackets are manufactured by Toyota and are available online or through authorized dealers.
- Gather the necessary tools: Before beginning the replacement, ensure you have the correct tools required for the job. This may include basic hand tools such as wrenches, screwdrivers, and any other specific tools recommended by the bracket manufacturer.
- Refer to installation instructions: Carefully follow the installation instructions provided with your new fuel pump bracket. These instructions will guide you through the specific steps involved in mounting the bracket securely and ensuring a proper fit.
- Disconnect the fuel system: Before removing the old bracket, you will need to disconnect the fuel lines and any electrical connections associated with the fuel pump. It is important to exercise extreme caution during this step to avoid any fuel spills or leaks. Make sure the engine is cool and use appropriate safety gear, such as gloves and eye protection.
- Remove the old bracket: Once the fuel system is disconnected, carefully remove the old fuel pump bracket. Pay close attention to how it is mounted and take note of any hardware or fasteners used, as you will need to reinstall these with the new bracket.
- Install the new bracket: Position the new fuel pump bracket in place, ensuring it is securely mounted and aligned correctly. Reattach any hardware or fasteners removed during the previous step. Refer to the installation instructions for torque specifications and any specific recommendations for your vehicle.
- Reconnect the fuel system: Carefully reconnect the fuel lines and electrical connections to the fuel pump. Ensure all connections are secure and tight to prevent leaks.
- Inspect for leaks: Once the new bracket and fuel pump are installed, inspect the entire fuel system for any signs of leaks. Use a clean rag or paper towel to wipe down the area and check for any fuel residue or odors.
- Test the vehicle: Start the engine and let it run for a few minutes. Check for any unusual noises or vibrations that may indicate an issue with the new bracket or fuel pump. Ensure that the vehicle is running smoothly and that fuel delivery is consistent.
By following these steps, you can successfully replace the fuel pump bracket on your AE86, ensuring optimal fuel system performance and maintaining the reliability of your vehicle. Remember to always refer to manufacturer guidelines and seek professional assistance if you are uncomfortable performing this task yourself.
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Frequently asked questions
There are a few fuel pump options for your AE86. Some options include the Walbro 255LPH, 7MGTE (Supra Turbo 3.0 MA70), and RX7 FC turbo pumps.
To replace the fuel pump, you will need to remove the gas tank and locate the pump inside. Disconnect the old pump and wires, and connect the new pump using the existing wires.
It is recommended to replace the fuel pump bracket as they are often rusty and in bad shape. Additionally, consider replacing the old rubber hose to prevent fuel fumes from entering the cabin.
There are a few signs that your fuel pump may not be working properly. If your car is having debris problems, or if you need to blow air through the fuel lines to maintain consistent running, it may be time to replace the pump.
