GM Full-Size Trucks 1980-1987 Repair Guide

Relieving Fuel System Pressure

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The pressure regulator utilizes a constant bleed feature when the engine is turned OFF, but follow these general tips:

  1. Always disconnect the negative battery terminal.
  2.  
  3. Loosen the fuel filler cap to relive the vapor pressure in the fuel tank.
  4.  


CAUTION
The 220 TBI Unit introduced in 1986 has a bleed in the pressure regulator to relieve pressure any time the engine is turned off, however a small amount of fuel may be released when the fuel line is disconnected. Keep a rag handy to soak up any gasoline that might spill on any other components. Immediately dispose of the rag in a container approved for flammable or combustible refuse.



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Fig. Fig. 1: Cross sectional view of the TBI 220 operation

 
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