Sylvie Willis
Corvette is a two-seater car whose appearance has evolved over the years, but its basic mechanical features, including the fuel system, have largely remained the same. The 1968-1982 Corvette, for example, has a 20-gallon fuel tank and line that remained virtually unchanged from 1963 to 1974. The fuel tank in vintage Corvettes is made of steel and is susceptible to rust and abrasion over time. The flexible fuel lines that connect the fuel tank to the hard steel fuel lines that run along the car's frame are prone to rotting and cracking, causing fuel leaks. To replace these lines, one must remove the body of the car, which can be challenging.
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What You'll Learn
Flexible fuel lines
The fuel lines in the 1973 Corvette are made of steel. They run from the fuel tank to the engine, with the stock fuel filter installed on the smaller line. The fuel filter's direction of flow points back towards the tank.
When replacing the fuel lines, it is important to follow the factory installation and routing. The replacement lines are engineered from factory original lines and are designed to work with factory components. They include the correct tube ends and protective wrap.
Additionally, fuel clip sets and hoses are available for most lines. It is common for the fuel lines to vary slightly between model years, and they can be challenging to replace without removing the body of the car.
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Fuel tank replacement
Preparation:
Before beginning the replacement, it is important to gather the necessary tools and parts. This includes a new fuel tank, a fuel tank sender tool, slip joint pliers, a large pry bar, hose clamps, and a new filler neck boot. It is also recommended to have a service manual for reference, such as the 1971 Chassis Service Manual, which contains detailed information about the Corvette fuel system.
Removing the Old Fuel Tank:
Start by disconnecting the fuel gauge wires going to the tank pick-up. The tank is held in place by two straps that are parallel to the tank and perpendicular to the Corvette. Remove these straps, and carefully twist and turn the tank to remove it from the vehicle. It may be necessary to remove the exhaust for easier access.
Installing the New Fuel Tank:
Place the new tank in position, ensuring that the sender's fuel outlet pipe is not supporting the weight of the tank. Lay the filler neck gasket and drop the filler neck on top, securing it with screws tightened in a star pattern to compress the gasket evenly. Apply silicone spray to the filler neck boot and push it onto the top of the filler neck and down onto the fuel tank.
Final Steps:
Transfer the original fuel cap flange to the new tank using the new gasket and gasketed screws. Reinstall the sender/fuel feed assembly using a new O-ring, tightening it with a screwdriver and hammer. Fill the tank with fuel and check for any leaks.
It is important to note that the fuel system in the 1973 Corvette is complex, and there may be variations in the specific steps and parts required depending on the model and year of your Corvette. Always refer to a service manual or seek professional assistance if you are unsure about any part of the process.
Additionally, pay close attention to the fuel lines during the replacement process. Stock fuel lines may vary between model years, and it is important to ensure that they are properly routed and secured.
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Fuel filter placement
The fuel filter placement in a 1973 Corvette is an important consideration for maintaining the vehicle. While specific instructions for the 1973 model are not readily available, some general guidelines and insights can be provided based on information for Corvette models from the same era.
Firstly, it is worth noting that the 1968-1982 Corvette was the longest-running generation, and many of its basic mechanical features, including the fuel system, remained largely unchanged. This includes the 20-gallon fuel tank and line, which were consistent from 1963 to 1974, apart from a mid-year change in the 1969 model. Therefore, insights from other years within this range may be applicable to the 1973 Corvette.
When it comes to fuel filter placement, it is recommended to refer to the assembly instruction manual for the specific model year. Stock fuel filters and fuel lines may vary between different model years. In some cases, previous owners may have made modifications, such as adding non-stock rubber lines and fuel filters. As a result, it is important to consult the factory installation instructions to ensure proper placement.
In general, the fuel filter is typically installed on the smaller line, with the direction of flow pointing back towards the tank. It is also common to have an inline fuel filter located somewhere after the fuel pump and before the carburettor. This can be a small inline filter near the carburettor, as some Corvette owners have mentioned.
When refreshing the fuel system, it is important to use the correct fuel hose designed to handle fuel. Using rubber hoses that are not meant for fuel can lead to premature failure and the need for early replacement. Additionally, when working on the fuel tank, always have a fire extinguisher nearby and disconnect the battery to prevent any sparks during the process.
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Fuel line material
The 1973 Corvette is a car with a lot of character, and maintaining it is a labour of love for many owners. One of the key aspects of Corvette care is ensuring the fuel system is in good condition, and that includes the fuel lines.
The fuel lines on a 1973 Corvette are an important part of the car's fuel system, transporting fuel from the tank to the engine. Over time, these lines can become damaged or corroded, especially if the car has been driven in winter conditions where road salt is used. Replacing these lines can be a challenge, as some models require the body to be removed for access.
When it comes to the fuel line material for a 1973 Corvette, there are a few options to consider. The original equipment manufacturer (OEM) fuel lines for Corvettes were typically made of steel, specifically Tinned Bundy Weld (TBW) steel. This type of steel is known for its strength and durability, making it a reliable choice for fuel lines.
However, some owners have shared their experiences with using alternative materials for fuel lines. In one case, an owner replaced a damaged fuel line with a rubber line, specifically a thick-wall gas line, as it was difficult to install a new steel line without removing the body of the car. While this may be a temporary solution, it is important to note that using non-stock materials like rubber can deviate from the original specifications of the car.
Another option that has been mentioned by Corvette enthusiasts is stainless steel fuel lines. These lines are known for their corrosion resistance and longevity. Some owners prefer this material as it may require less frequent replacements compared to other options.
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Fuel tank inspection
Step 1: Check for Leaks
Start by inspecting the ground underneath the fuel tank for any signs of gasoline leaks. Look for pooled fuel or stains, and use your sense of smell to detect the strong odour of gasoline. If you notice any leaks, it is crucial to address them immediately to prevent worsening fuel economy, potential fires, or even explosions.
Step 2: Identify the Source
If a leak is detected, the next step is to identify its source. Determine whether the leak is coming from the fuel tank itself or the fuel lines. This step is crucial in deciding the appropriate course of action for repairs.
Step 3: Inspect the Fuel Tank
If the leak is coming from the fuel tank, a thorough inspection of the tank is necessary. Check for any signs of corrosion, punctures, or damage that could be causing the leak. Pay close attention to the seams of the tank, as leaks in those areas can worsen over time if left unattended.
Step 4: Assess Repair Options
Based on the inspection, determine if the fuel tank can be repaired or if it needs to be replaced. Minor leaks or corrosion may allow for repairs, while more severe damage, such as punctures, may require a full tank replacement.
Step 5: Consult a Mechanic
It is highly recommended to consult a qualified mechanic, especially if you decide to repair or replace the fuel tank. A mechanic will be able to provide a detailed inspection report, outlining the nature and cause of the leak, and suggesting the necessary repairs. They will also ensure that all appropriate parts are reconnected and that the fuel system is functioning correctly after any repairs or replacements.
Step 6: Preventative Measures
To maintain the integrity of your fuel tank and prevent future issues, consider taking preventative measures. For example, if you live in an area with snowy and salty conditions, corrosion may be more prevalent. Regular inspections and proper maintenance can help mitigate these issues and extend the life of your fuel tank.
Remember, fuel tank inspection and maintenance are crucial aspects of owning a classic car like a 1973 Corvette. Always prioritize safety and consult professionals when dealing with flammable liquids and potential hazards.
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Frequently asked questions
The process of refreshing a 73 Corvette gas tank involves draining the fuel, disconnecting the battery, and removing the spare tire to access the fuel tank. The tank should then be inspected for any signs of rust or damage. If necessary, the fuel lines and hoses can be replaced, and the tank can be cleaned or replaced. Finally, the new or refreshed tank can be installed, and the fuel system tested for any leaks.
The fuel system in a 73 Corvette includes a 20-gallon fuel tank, flexible fuel lines, and hard steel fuel lines that run along the car's frame. It also includes a fuel pump, a carburetor, and various filters and vents.
The stock fuel lines in Corvettes from the early 1960s to the early 1980s were typically made of steel. However, some owners have replaced the original steel lines with non-stock rubber lines or stainless steel lines. It is important to use fuel-specific hoses to prevent leaks and seepage.
