4mm CIS Vacuum Line


Mk1 & Mk2 4mm CIS Vacuum Line

SKU: 4mm-CIS-Vacuum-Hose-PerFt Categories: , , ,


Mk1 & Mk2 4mm CIS Vacuum Line

Replace the 4mm CIS Vacuum Line / Hose in your Mk1 or Mk2 Scirocco with our new vacuum lines. Even if your line look ‘ok’, they may still need replaced. Vacuum check them to determine if they are in fact leaking. We use a Mityvac MV8000 tool to test this.

New lines help with faster cold starts and more stable idle. Also, replacing the vacuum hose couplers will help these symptoms as well. Lines come in multiple colors by the foot.

Vacuum Line: 4mm OD – Factory Spec
Current colors in stock: Black, Red, Oragne, Yellow, Green, Blue, Purple, Clear, & White.
Per Ft – Minimum order – 6ft

Replaces Part Numbers:
N 020 353 5 / N0203535
N 020 139 1 / N0201391

6mm vacuum hose also available.

Why should I replace my vacuum lines?

Replacing the vacuum lines on your Scirocco’s Bosch CIS fuel injection system can bring several benefits. Here’s why you should consider it:

  1. Improved Performance: Over time, vacuum lines can become brittle, cracked, or leaky, resulting in reduced engine performance. By replacing these lines, you can restore the proper flow of vacuum and ensure that your fuel injection system operates optimally. This can lead to better acceleration, smoother idling, and improved overall engine performance.
  2. Fuel Efficiency: Vacuum leaks can disrupt the fuel-to-air ratio, causing your engine to run rich or lean. This can result in reduced fuel efficiency and increased fuel consumption. By replacing the vacuum lines, you can help maintain the correct fuel mixture, maximizing fuel efficiency and potentially saving you money at the pump.
  3. Reliability: A faulty vacuum line can cause various engine problems, including misfires, rough idling, and stalling. By replacing these lines, you can prevent such issues and improve the reliability of your vehicle. This is particularly important for older vehicles like the Scirocco, where worn-out vacuum lines are common.
  4. Emissions Compliance: A properly functioning fuel injection system contributes to lower emissions. Vacuum leaks can disrupt the combustion process, leading to increased emissions. Replacing the vacuum lines can help ensure that your vehicle meets emissions regulations, reducing your environmental impact.
  5. Preventive Maintenance: Replacing old, worn-out vacuum lines is a proactive way to maintain your vehicle’s performance and prevent potentially costly repairs down the line. By addressing this issue preemptively, you can extend the lifespan of your fuel injection system and avoid more significant problems in the future.

Overall, replacing the vacuum lines on your Scirocco’s Bosch CIS fuel injection system can improve performance, fuel efficiency, reliability, emissions compliance, and serve as a preventive maintenance measure. It is a worthwhile investment that can enhance your driving experience and prolong the life of your vehicle.

Additional information

Weight .005 lbs
Dimensions 1 × 1 × .1 in
4mm Vacuum Hose Color

Black, Red, Orange, Blue, Green, Yellow, Purple, White, Clear

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