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Bostech Tech Tips for MPI and Vortec CPI Fuel Injectors

If you're getting Raw fuel to exhaust pipe:

  1. Check for open intake valves.
  2. (Bad pressure regulator)  It builds too much pressure in the fuel rails and consumes a large amount of excess gasoline.  Also, ½ gallon of fuel ends up in the oil pan.  In this case, the oil should be changed immediately.


If you're getting Raw fuel to exhaust pipe on early Vortec 4.3L engines:

  1. Plastic fuel lines that connect the injector’s fuel housing to the metal fuel supply should be replaced with the injector assembly to prevent engine flooding, oil contamination, and engine stall.  Reference GM CPI nut kit, Bostech Part Number 55163.
  2. Fuel in the exhaust pipe could be a symptom of a leak in the fuel pressure regulator.
  3. Poppits on spray nozzle could be stuck open if the area they connect to is not clean and debris contaminates the spray tips.


To find the fuel leak:

  1. Remove upper intake manifold
  2. Turn the key on (but do not attempt to start the vehicle)
  3. After the fuel pump comes on, you should be able to visually identify any leaks.

Tech Tips for MPI and Vortec CPI Fuel Injectors


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