Fuel Injector Connectors

Do your new fuel injectors have USCAR connectors while your car's wiring harness uses a different plug? This category contains connectors, pigtails, adapters and spare parts for injector connectors that make the injector and wiring harness fit together – for you who are upgrading injectors or repairing a worn connector.

Connectors, pigtails and adapters – what's the difference?

A connector adapter fits between the injector and the car's original connector, so you typically don't have to cut into the wiring harness. Examples include the DeatschWerks USCAR to Honda (OBD2/K-Series Type) PnP Adapter and the Injector Dynamics Denso EV1 PnP Adapter. A pigtail – a short length of wire with a connector – is spliced into the wiring harness and provides a permanent solution, for example when the original connector is brittle or broken. Loose connector housings and pins, such as DeatschWerks' Sumitomo repinning kit, are used when you want to build the connector yourself.

How to choose the right injector connector

Start by knowing both ends of the connection:

• Injector connector: e.g. USCAR, Denso (Sumitomo) or Jetronic – check the fuel injectors you are installing.
• Harness connector: e.g. Honda OBD2 or Toyota from 2000 onwards, for which adapters are available in this category.
• Male or female: Injector Dynamics' USCAR kits come in both versions, so choose according to the side you are replacing.
• Type of solution: an adapter can be removed again, whereas a pigtail is typically permanent.

Installation and fitment

An adapter makes the connection longer, so check the space around the fuel rail. If you are changing injectors, it makes sense to also look at new injector seals. The connector must click fully into place, and the pins must be clean, as a poor connection can cause misfires or fault codes. For the GM 2500/3500 Duramax L5O (2017-22), for example, there is a replacement connector from Fleece Performance, and BLOX Racing and FAST are also represented in the category.

Frequently asked questions

Should I choose an adapter or a pigtail kit?

An adapter clicks in between the injector and the original connector and can be removed again if you go back to the original injectors. A pigtail is spliced into the wiring harness and is typically the best choice if the original connector is damaged.

How do I know whether I need a male or female connector?

Look at which part you are replacing. The female connector typically sits on the wiring harness and grips the injector's terminal, while the male connector corresponds to the injector side. Compare with the product description for the specific part number before you order.

Can a bad injector connector cause engine problems?

Yes, corroded or loose pins can cause an unstable connection to the injector. This can show up as misfires, rough idle or fault codes. So check the connector and pins before troubleshooting the injector itself.