Redline Injectors

Premium Fuel Injector Cleaning, Injector Flow Testing, & Ultrasonic Fuel Rail Cleaning

High-Pressure GDI Cleaning And Testing

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Premium GDI Injector Cleaning and Testing

  • At Redline Injectors, we do things differently. Traditional cleaning methods dating back to 1989, use mostly water and lightly dissolve tip deposits, leaving stubborn internal buildup and restrictions untouched.
  • Our TrueFlow Bench, Ultrasonic and POWERFLUSH machine all use a proprietary injector safe solvent cocktail to achieve unmatched fuel injector cleaning from the inside out.
  • Restore maximum power and OEM-level performance with our injector service. Where compromise ends, premium begins. Don’t settle for less, go with Redline Injectors!
Click Here to Order Injector Identification
What to Expect GDI Injector Cleaning And Testing Services | High-Pressure GDI Cleaning And Testing | Redline Injectors

What to Expect GDI Injector Cleaning And Testing Services

Whether your GDI injectors are dirty or clogged, our premium injector cleaning and flow testing service delivers manufacturer-level static and dynamic testing on state of the art precision computer-controlled benches and includes all required replacement parts.

  • If we determine the injectors is bad electrically or mechanically before we begin cleaning and testing we will call you and let you know and refund you the service cost of that injector.
  • After we clean them, if the injector is still leaking badly we won’t even test them as we know they will fail. We will call you and let you know and refund you the service cost of that injector.
  • Specific to Direct injectors only, once cleaning and testing are performed, if an injector fails to the point of being unusable, no refund is issued. The injector’s condition is determined after approximately two hours of labor, and that outcome is considered a valid test result.
High-Pressure GDI Injector Test Bench | High-Pressure GDI Cleaning And Testing | Redline Injectors

High-Pressure GDI Injector Test Bench

  • These injectors operate at extremely high pressures of 1000-1800 PSI. Our Carbon Zapp GDR-X test bench, featuring computer-controlled fluid temperature management supports manufacturer-specific injector flow test plans at pressures up to 5,000 PSI exclusively for all Direct injector testing. Each injector is evaluated according to manufacturer test plans to ensure OEM-level accuracy with up to 8 precision tests per injector on our computer-controlled test bench.
  • While a majority of shops only have a Port injector bench, GDI (Gasoline Direct Injection) injectors cannot be accurately tested on a port injector bench. Port injectors operate at 40–80 psi, while GDI injectors run at 500–3,000+ psi, far beyond the capabilities of a port bench. They must be tested for high-pressure leaks, internal sealing, and proper spray atomization, none of which a port bench can measure. Testing a GDI injector on a port bench can give false “good” results or even damage the injector. While a port bench can perform basic electrical resistance checks or limited actuation confirmation, proper GDI testing requires a dedicated high-pressure test bench with OEM-style drivers, capable of accurately measuring flow, leak-down, spray pattern, and response time under real operating pressures.
  • A very small number of shops use this class of machine. Wondering why most shops still use port injector machines for GDI testing? Click the “Proper GDI Testing” link to learn more.
Proper Direct Injector Testing
GM GDI Injector: Port vs. Direct Bench Spray | Fountain Head Asset Management

GM GDI Injector: Port vs. Direct Bench Spray

  • Let’s examine how a GM GDI injector’s spray alone differs when tested on a port injector bench versus a proper direct injection bench. On a port injector test bench, operating at a maximum of 95 PSI, the injector can appear to gush up to 400 cc per minute, with flow measured in a graduated cylinder. In contrast, on a direct injector test bench at 1,500 PSI, the injector atomizes fuel properly at a much lower flow rate, with all measurements taken internally by the machine.
  • Here’s what testing looks like on a direct injector bench: all measurements are taken internally by the machine, with no graduated cylinders or visual estimation used. In this example, the test pressure is 160 bar (2,320 PSI).
How to Read GDI Injector Test Reports | High-Pressure GDI Cleaning And Testing | Redline Injectors

How to Read GDI Injector Test Reports

These injectors generate performance reports with unique terminology. To help make sense of them, we created a guide to understanding GDI flow test reports. There will be 1 report per numbered injector and are electronically delivered to your email.

How to read GDI Reports

Key Topics For GDI Injectors

How do GDI Injectors Work?

Gasoline Direct Injection (GDI) injectors work by delivering fuel directly into the combustion chamber of an internal combustion engine, rather than into the intake manifold as in traditional port fuel injection systems.
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Proper GDI Testing

In The Beginning GDI injectors were first used in the automotive industry without the ability to be clean or test them. Electronically there was no way to trigger the injector...
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Can you test GDI/Piezo injectors on a Port injection machine?

Testing a Gasoline Direct Injection (GDI) injector on a machine designed for Port Fuel Injection (PFI) injectors is not recommended due to significant differences in their operating principles and requirements.
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How are Piezoelectric and GDI Injectors different?

Piezoelectric injectors and GDI injectors (Gasoline Direct Injection injectors) are both types of fuel injectors used in modern internal combustion engines, but they differ significantly in terms of technology, performance, and functionality.
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How often should I have fuel injectors cleaned and why?

Port, TBI, GDI and Piezo Fuel injectors should generally be professionally cleaned according to the guide below. At home and in-engine treatments can sometimes cause more problems than they solve....
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What are differences between Port and GDI Injectors?

Port injectors and GDI (Gasoline Direct Injection) injectors are two different types of fuel injectors used in modern internal combustion engines. The main differences between them lie in the way they deliver fuel to the engine, their position relative to the intake system, and their function in the combustion process.
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Fuel Injector System Service Exclusions | High-Pressure GDI Cleaning And Testing | Redline Injectors

Fuel Injector System Service Exclusions

  • ​We do not service Diesel, CPI/SCPI Spider, FICHT injectors or Flux Capacitors.
  • See our Injector Type Page for visual references

Shipping and Service FAQs

Service Related Questions

Yes, we have a 2 injector minimum.

Absolutely! Rest assured that we will take care of removing the injectors for you for (typically GDI and side feed) and invoice you for a bench fee of $10 per rail to do the work as problems can often arise. However, it’s important to note that we cannot be held responsible for any potential damage that may occur during the removal process. To ensure a smooth experience, we recommend that you personally remove the injectors from the rail.

To avoid any issues with shipping service secure them in plastic and tape them to prevent leaks.

For your convenience, side feed injectors will be re-installed in the fuel rails, top feed and GDI injectors will be packaged separately. GDI Injector clips are fairly easy to remove, you should not have no any issues, but if yours are tricky to remove we will can do it if you wish.

  • Service prices and options are posted in store per item type as well as on the pricing page. Service Pricing
  • Please check the Injector id injectors page on the menu if your unsure what you have. Injector ID

Turn around times are stated on the Home page.

We always replace filters, O-rings, seals, spacers, grommets etc. whenever they are available for the injector, this includes side feed injectors as opposed to cleaning them while still on the injector as most places do. They become fragile over time, why take a risk.

In fact we replace everything that is replicable.

Shipping Related Questions

For local drop/pick up service check the “Local Drop-Off” box on the order form.

Once order is places, email us at [email protected] for drop off instructions.

  • Shipping insurance up to $100 is automatically provided.
  • To add Shipping additional Insurance, please select amount coverage you’d like using the “Shipping Insurance” line item before checkout.
  • Additional shipping insurance is calculated for you based on $1.60 per $100 of declared value.
  • Please insure items based on their actual replacement value, extra insurance above the value will accomplish nothing, claims are on shipment value, not amount of insurance bought.
  • Insurance applies only to the item we’re returning to you.

Yes we will email the contact on the “Order receipt” that we get a copy of when you place your order.  Include your Name on a card or paper inside the shipment box as the shipping label sometimes gets obscured.

Include your Name on a card or paper inside the shipment box as the shipping label sometimes gets obscured.

We accept shipments from UPS, USPS, Fedex or DHL to following address 7 days a week.

Sending UPS is the optimal choice within the US, however.

Redline Injectors
3036 State Route 35 #227
Hazlet, NJ 07730

Include your Name on a card or paper inside the shipment box as the shipping label sometimes gets obscured.

​When preparing the injectors for shipping, it is strongly advised to place them inside a regular zip lock bag first. This will help to keep the fuel smell contained. It is important to avoid any damage during transit, so make sure not to simply toss the bag into a box without any additional packing material. This is particularly crucial for the pintle end.

It is not recommended to ship the injectors in a bubble envelope. Optimal protection can be achieved by using a box with some padding or a bubble envelope in a box. The small flat rate box from the Post Office may be good budget-friendly option for smaller injectors.

Send the injectors with all O-rings and related components, either installed on the injectors or placed together in a bag.

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