What to Do When the Fuel Injector Cannot Be Pulled Out?
3 Answers
If the fuel injector is burnt out, it does not necessarily mean it is scrapped. You can remove the carbon deposits on the needle valve with a soft object and appropriately grind the engine oil, and it can still be used. If it cannot be pulled out, place the fuel injector in a diesel container, heat it until it starts to boil, take out the fuel injector, and clamp it in a vise to pull out the needle valve. Use a drill bit or steel wire to clean the oil passages in the valve body. Insert a bent scraper into the annular oil passage in the valve body to scrape off the dirt in the ring groove. Use a scraper to clean the carbon deposits on the valve seat. Use a probe to remove the carbon deposits in the auxiliary injection holes. Insert a probe into one injection hole and rotate it until it connects through.
Last time I encountered a situation at the shop where the fuel injector wouldn't come out, and the customer said they'd been pulling at it for half a day with no movement. Actually, this is mostly caused by carbon deposits welding the injector to the base, just like a rusted screw. Don't yank it hard right away—first disconnect the negative battery terminal and wait ten minutes to release the pressure. Spray WD-40 or a dedicated loosening agent heavily into the seam, let it soak for two hours, then gently twist the injector left and right to loosen it. I've tried using a heat gun on low temperature (don't exceed 150°C) to heat the base, utilizing the principle of metal expansion and contraction to separate it. If it still won't budge, you'll need to remove the entire fuel rail and secure it in a bench vise for further handling. Key points: Clean surrounding dust before handling, wear protective gloves, and after removal, remember to thoroughly clean the mounting groove with carburetor cleaner.
I enjoy tinkering with old cars, and last week I got stuck removing the fuel injector. Here's a handy trick: use two small C-clamps to symmetrically grip the metal parts on both sides of the injector. Slowly and alternately tighten them with a wrench, allowing the clamps to evenly push out the injector while continuously spraying penetrating oil for lubrication. This method is easier than pulling by hand and prevents breaking the injector by applying uneven force. Listen carefully for any cracking sounds during the process—stop immediately if you hear any. If it's still stuck, consider removing the throttle body assembly to create more working space. Although it's more tedious, it's safer than yanking hard. After removal, always check if the sealing ring is deformed, and apply some engine oil to lubricate before installing a new injector.
