
Connecting hard plastic vacuum hoses can be a tricky task. Hard plastic vacuum lines are often bonded into rubber grommets, and in heat-exposed places, they can become brittle and fall apart when bent. Replacing these lines with silicone or rubber hoses is a common solution, but it's important to ensure you're using the correct type and size of hose. In this paragraph, we will explore the challenges of connecting hard plastic vacuum hoses and provide an overview of the solutions available to help you tackle this issue effectively.
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What You'll Learn

Replacing hard plastic vacuum lines with rubber or silicone hoses
If you're looking to replace hard plastic vacuum lines with rubber or silicone hoses, there are a few things you should keep in mind.
First, you'll need to determine the correct size of the replacement hose. The most commonly mentioned size is 3/8", but some sources suggest that 1/4" could also be correct. It's important to get the right size to ensure proper function and avoid any issues.
Second, you should consider the benefits and drawbacks of both rubber and silicone hoses. Rubber hoses are generally more durable, cheaper, and readily available at automotive stores like AutoZone/Advanced, where they can be purchased by the foot. However, rubber hoses are less heat resistant than silicone and can dry out and crack over time. Silicone hoses, on the other hand, are more flexible and have a longer lifespan, but they are more expensive and require careful handling during installation to avoid damaging the fittings. Additionally, most silicone hoses are not compatible with fuel or oil, and you must buy silicone that is "sensor safe" to avoid damaging the O2 sensor.
When replacing the vacuum lines, it is recommended to replace them one at a time to ensure proper installation. You can purchase a kit that includes silicone hoses in various lengths and inner diameters, which should provide enough options to find the correct size for your vehicle.
Finally, some people have expressed concerns about potential drive-ability issues when replacing thin plastic vacuum lines with rubber or silicone hoses, as the larger diameter of the hoses could affect sensor readings. However, others have reported no issues with making this switch, and any loss of signal due to expansion/contraction of the rubber lines is negligible in practice.
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Buying the right size replacement hose
When it comes to buying the right size replacement hose for your vacuum, there are several factors to consider. Firstly, it is important to understand the specific cleaning needs you have and the features of your central vacuum system. Different hoses are designed for different tasks, so choosing the right one will significantly improve your cleaning experience.
Basic hoses, for example, are a straightforward option that fits most central vacuum wall inlets. They are simple to use, activating the system when inserted and deactivating it when removed. If you require more advanced features, electric hoses integrate low and high voltage wires, allowing you to control both your central vacuum and power nozzle with a three-way switch on the handle. Low-voltage hoses, on the other hand, are designed specifically for central vacuum control and turn on automatically when plugged into the wall inlet.
Another important consideration is the diameter of the hose. Vacuum hoses come in a variety of diameters, each engineered for different cleaning capabilities and compatibility with specific vacuum systems. A smaller diameter hose, typically ranging from 1-1/4" to 2-1/2", is more manoeuvrable, flexible, and lighter, making it ideal for handheld power tools. However, a larger diameter hose can handle bigger debris with less likelihood of clogging. For central vacuum hoses, a standard 1.5" diameter is widely regarded as a universal option, fitting most brands and providing optimal airflow and cleaning power.
When replacing a plastic vacuum hose with a rubber or silicone hose, it is crucial to get the correct size. Some common sizes for plastic vacuum lines include 3/8", 5/32", and 1/4". You can find replacement hoses in automotive stores or online, either in pre-cut lengths or rolls. It is important to measure your vacuum's hose diameter accurately to ensure compatibility and optimal performance.
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Using hose kits for replacement
Hose kits are a convenient way to replace your vacuum hoses and ensure your vacuum continues to perform effectively. Hose kits are available for both central vacuum systems and car vacuums.
For central vacuum systems, hose kits can be purchased online from retailers such as CentralVac, which offers a range of hose lengths to cater to different cleaning needs. These hoses often feature ergonomic handles and on/off switches, enhancing the convenience and ease of use. Central vacuum hoses are designed to be durable, undergoing rigorous testing to ensure resistance to crushing, kinking, and wear.
For car vacuums, hose kits are available in both generic and vehicle-specific options. Generic vacuum hose kits can be purchased in bulk, and while they may require some adjustments to avoid kinking, they are generally suitable for most cars. On the other hand, vehicle-specific hose kits, such as those for Alfa Romeo and Subaru, offer silicone vacuum hoses that can be bent into any shape. These kits may be more expensive, but they ensure a perfect fit and can be customised according to your requirements.
When replacing vacuum hoses, it is essential to consider the material. Some options include rubber, silicone, plastic, and nylon. Rubber and silicone hoses are popular choices due to their durability and flexibility. They can be purchased from automotive stores or online retailers. Plastic and nylon hoses are also available, but they may be more susceptible to heat damage and cracking over time.
Additionally, hose kits may include various adapters, cuffs, and connectors to facilitate repairs or customisations. These accessories enable you to connect different hose pieces, adapt to specific inlet sizes, or create unique configurations to suit your needs.
By opting for hose kits, you can conveniently replace your vacuum hoses, ensuring your vacuum remains in optimal condition and providing you with a more efficient and enjoyable cleaning experience.
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Bending hard plastic vacuum lines with heat
Overheating the plastic can cause less focused lines, deformation, and melting. On the other hand, underheating the plastic will make it fragile, difficult to work with, and cause stress fractures. Once the plastic is heated, bent, and fabricated into its final form, it needs to be appropriately cooled to hold its shape, establish its firmness, and remain structurally sound. This cooling process is equally important as particular plastics require special conditions to reach their optimal structure and retain their features.
To bend hard plastic vacuum lines, you can use a hot wire or heating element. When taut, the hot wire radiates focused heat in a straight line across the material, making only that straight line malleable. Once the plastic has reached the appropriate temperature, it is quickly removed and placed into a former or jig to cool. This process can be used to form the plastic into simple shapes, such as straight lines, and it will hold its shape once it has cooled down.
Some machines offer multiple wires to heat multiple lines simultaneously to create more sophisticated shapes. This practice is commonly used in industries and manufacturing because of its low cost, fast results with minimal equipment, and simplicity.
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Choosing between hard and soft vacuum lines
When it comes to choosing between hard and soft vacuum lines, there are several factors to consider. Hard plastic vacuum lines are typically used in cars due to their low cost and space-saving capabilities. They are also easier to find and can be purchased from parts stores, allowing for customisation through bending with heat. However, hard vacuum lines can be fragile and prone to cracking, especially in high-temperature environments near the engine, turbocharger, or other components.
Soft vacuum lines, on the other hand, are made of silicone or rubber and offer greater flexibility and durability. They are less likely to crack or break compared to hard lines, making them a more reliable option. Soft lines can withstand temperatures ranging from -51°C to 238°C (-60°F to 460°F) without issue. However, standard silicone lines are susceptible to degradation by various petroleum products, so they may not be suitable for oil lines. Thick-walled tubing is recommended for soft vacuum lines to prevent collapse under vacuum and ensure a secure fit without the need for hose clamps.
The choice between hard and soft vacuum lines ultimately depends on specific requirements and preferences. Hard lines may be preferred for their stock appearance and ease of customisation, while soft lines offer durability and flexibility. Soft lines are also more readily available and cost-effective, making them a popular choice for replacements. It is important to ensure that the chosen line has the appropriate internal and external diameters for a secure fit and to verify the quality of the silicone by burning a piece of the hose and observing the colour of the ash.
Additionally, it is worth noting that the type of vacuum line used may have implications for sensor readings due to the expansion and contraction of rubber lines. However, this effect is negligible in practice. For those seeking to replicate the original appearance of a show car, visually matching the hard lines is important. Ultimately, the decision between hard and soft vacuum lines should consider factors such as ease of use, durability, temperature resistance, cost, and availability.
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Frequently asked questions
Some good alternatives to hard plastic vacuum hoses are rubber hoses, nylon tubing, and silicone hoses.
Silicone hoses are a long-term fix, they look great, and make servicing much easier. They are also resistant to petroleum products, which standard silicone is attacked by.
Hose Candy and Siliconeintakes.com are two websites that sell vacuum hoses. You can also buy them from automotive stores, such as AutoZone.











































