What are the symptoms of bad fuel injector O rings?
1. Fuel smell from the engine bay One of the first symptoms of a problematic fuel injector o ring is a fuel smell. If the fuel injector o rings dry up or crack, they may leak fuel vapors that will cause a fuel smell from the engine bay. The smell will eventually get stronger as the leak grows larger. 2. Fuel leak
How to change LB7 injectors with pictures?
Tighten the 12mm banjo bolt that goes into the head to 11 lb ft Put a bead of sealant to the bottom of the upper valve cover about 2-3mm wide and 1mm high and install the upper valve cover. One thing to take note of upon reassembly, is to seal the top of the high pressure line fitting.
Where are the fuel injector O rings located?
Fuel injector o rings are a component that is found on virtually all vehicles equipped with fuel injectors. The injector o rings that seal the tip of the injector with the intake manifold and fuel rail.
What makes a fuel injector seal wear out?
Fuel injector seals are usually made of polyurethane or nitrile rubber due to their fuel resistant properties. While the o rings are made to be heavy duty, over time they can eventually wear out and cause issues with the vehicle. Usually bad or failing o rings will produce a few symptoms that can alert the vehicle of a potential issue. 1.
What causes a fuel injector to fail on a LB7?
Aside from the carbon buildup caused by DI, the fuel injectors themselves are also very common failure points, even on non-GM engines. The LB7 injectors had two potential design flaws that could cause injector failure.
What kind of pump does the LB7 engine use?
The LB7 uses a 23,000psi rail along with a Bosch CP3 injection pump, also known as a high pressure fuel pump. Aside from the carbon buildup caused by DI, the fuel injectors themselves are also very common failure points, even on non-GM engines. The LB7 injectors had two potential design flaws that could cause injector failure.
What causes a fuel line to leak on a LB7?
As part of the fueling system you have a fuel filter and filter head which filters fuel before the fuel is sent through the lines to the injectors. On the LB7, the fuel lines are occasionally known for leaking. However, the majority of LB7 fuel leaks are caused by the filter housing. The head of the housing uses multiples o-rings to seal the pump.
What causes fuel injector to leak and cause hard starting?
Leaking fuel injector can be cause of hard starting. This is because the fuel rail pressure has dropped and fuel has leaked into the manifold and causes the spark plugs to become flooded. Both top feed and side fuel injectors make use of O-rings to seal between the fuel injector and fuel rail.