OEM GMC Sierra 3500 Fuel Injector

GMC Sierra 3500 Fuel Injector Parts and Q&A

• Injector
  12574927
  Q: How to clean fuel injectors effectively on GMC Sierra 3500?

  A:

  The required tools for fuel injector cleaning include Fuel Line Shut-Off Adapters (J 37287), Fuel Injector Cleaner (J 35800-A), 3/8 Fuel Line Shut-Off Valve (J 42873-1), 5/16 Return Pipe Shut-Off Valve (J 42873-2), 3/8 Fuel Pipe Shut-Off Valve (J 42964-1), and 5/16 Fuel Pipe Shut-Off Valve (J 42964-2). Only use GM Top-Engine Cleaner as directed and avoid administering it to the fuel tank while maintaining a maximum cleaning solution ratio at 10 percent. Due to new odometer data, the standard procedure calls for new fuel injectors instead of cleaning them in vehicles that have less than 160 kilometers (100 miles). A complete cleaning solution requires 960 ml (32.4 oz) of which the Fuel Injector Cleaner (J 35800-A) needs two solution tanks for operation. American dealerships should transfer 48ml (1.62oz) of Engine Top-Engine Cleaner Product Number 12346535 into the Fuel Injector Cleaner J 35800-A while Canadian dealers must fill the Fuel Injector Cleaner J 35800-A with 96ml (3.24oz) of Top-Engine Cleaner (Canadian P/N 992872). The mixture for cleaning consists of 96 ml (3.24 oz) Top-Engine Cleaner combined with 864 ml (29.16 oz) unleaded standard gasoline. The cleaning operation starts with a regular unleaded gasoline fill inside the tank followed by fuel pump disabling and line connection removal while using the right shut-off valves for plugging. Impose 510 kPa (75 psi) pressure to the Fuel Injector Cleaner (J 35800-A) while connecting it to the fuel rail until the engine stalls. Follow the steps by first disconnecting the Fuel Injector Cleaner (J 35800-A) then reconnecting the lines until the fuel pump relay after which the vehicle must run for two additional minutes. Execute the Injector Balance Test to determine each injector's fuel pressure reduction but replace the unit with the lowest pressure if replacement is needed. The addition of Port Fuel Injector Cleaner (GM P/N 12345104 or Canadian P/N 10953467) at one ounce per fuel gallon to the fuel tank requires follow-up instructions for both current and subsequent fill-ups. The customer needs to use GM Port Fuel Injector Cleaner every 5,000 km (3,000 mi) for maintaining injector cleanliness. A road test should be performed to confirm that the customer's case has been successfully addressed.
• Injector
  12580426
  Q: How to replace a fuel injector on GMC Sierra 3500?

  A:

  You need to begin by removing the Fuel Rail yet maintain all Fuel Injector electrical connector pins along with nozzles and keep the Fuel Injector dry from any cleaning solutions which could harm its electrical element. Watch for oil contamination by fuel because the fuel injectors have a leaking issue. The first step consists of removing both halves of the Fuel Injector retaining clip followed by extraction of the injector from the Fuel Rail while discarding the injector o-ring seals (2, 4) at the ends. Prior to replacement use the build date code stamped on the injector to order correct parts because the date code shows both the month of manufacturing and the factory production shift and day along with year. Place a new retaining clip onto the Fuel Injector after applying clean engine oil to the new o-ring seals (2, 4) and installing them to their positions. Push the Fuel Injector into the Fuel Rail with the electrical connector facing outwards so the retaining clip can lock onto a flange of the rail injector socket before reinstalling the Fuel Rail.