How to Install a Fuel Filler Neck

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The fuel filler neck on passenger vehicles is a solid piece of formed tubular steel that joins the fuel filler inlet and the rubber fuel fill hose on the gas tank. The fuel filler neck is connected to the filler inlet with steel screws. A steel hose clamp tightens the rubber fuel fill hose to the fuel filler neck in order to prevent gasoline from leaking out. As time passes, the fuel filler neck can rust, creating leaks and necessitating its replacement. Replacement fuel filler necks are available from auto parts stores and automobile dealerships.

Things You'll Need

  • Automotive jack
  • Jack stands
  • Wheel chocks
  • Flat-head screwdriver
  • 1/4-inch ratchet
  • 1/4-inch socket set
  • Fire extinguisher
  • Replacement fuel filler neck
  • Turn off the engine, shift the vehicle's transmission into park or first gear (standard transmission) and engage the emergency brake.

  • Place wheel chocks under the front wheels and raise the rear of the vehicle using an automotive jack. Support the vehicle with jack stands.

  • Remove the gas cap from the fuel filler inlet. Crawl underneath the rear end of the vehicle and unscrew the hose clamp holding the rubber fuel hose to the fuel filler neck with a flat-head screwdriver. Remove the screws holding the fuel filler neck to the fuel filler inlet with a 1/4-inch ratchet and an appropriately sized socket. Grip the rubber fuel fill hose and twist the fuel filler neck back and forth while pulling it away from the fuel filler hose until the two pieces are separated.

  • Place the lower end of the new fuel filler neck inside the rubber fuel fill hose and reinstall the hose clamp. Align the upper end of the fuel filler neck with the fuel filler inlet, then reinstall the steel retaining screws. Replace the gas cap.

  • Raise the vehicle and remove the jack stands. Lower the vehicle to the ground, start the engine and check for leaks.

Tips & Warnings

  • Always use extreme caution when working with gasoline. Keep a fire extinguisher nearby at all times.

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