Gas will irritate your skin and you’ll be touching the parts of the engine that get covered in the stuff, so wear rubber or nitrile gloves when you do this. Consider having a pro do this if you can. This isn’t a super difficult DIY job, but it involves working with gasoline. You could cause a gas leak or fire if you do this incorrectly.
Your cylinders fire on a combination of fuel and air, which is ignited to create the combustion. The intake pulls the air in while the fuel injectors fire the fuel.
On most connectors, there are tabs on the side that you press with your pliers to unlock the connector. In some vehicles, you may need to relieve the pressure in the fuel line. Refer to your manual for help. You may need to hold a rag over an air valve or unscrew the fuel line with a socket wrench to release the air.
You may want to put a rag down under the railing before setting it down, just to soak up any gasoline droplets.
Snap a quick photo with your phone so that you have a reference for the orientation and direction of each injector. You’ll install your new injectors the same way your current injectors are installed. It’s always a good idea to change each of your injectors as a set—even if only 1 or 2 of them need replacing. This ensures each cylinder in your engine gets an equal amount of gas.
If you absolutely cannot find replacement injectors, you can clean your old injectors and replace the O-rings. Never re-use the O-rings from the old injectors. These are the pieces of an injector most likely to fail over time.
If there was a cover on top of the fuel rail, replace that as well. If you removed a fuel line to bleed the system of the air, reconnect that with your socket wrench.
Even if it’s bright outside, use a flashlight. It’ll be a lot easier to spot the reflection on any leaking gas. If you cannot fix a leak, do not continue to drive the vehicle. The gas can catch fire. Have your vehicle inspected and repaired by a mechanic before driving it again.
