GM Full Size Vans 1967-1986 Repair Guide

Tank Assembly

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DRAINING




CAUTION
Disconnect the battery before beginning the draining operation.

If the vehicle is not equipped with a drain plug, use the following procedure to remove the gasoline.

  1. Using a 10 ft. piece of 3 / 8 in. (9.525mm) hose cut a flap slit 18 in. (457mm) from one end.
  2.  
  3. Install a pipe nipple, of slightly larger diameter than the hose, into the opposite end of the hose.
  4.  
  5. Install the nipple end of the hose into the fuel tank with the natural curve of the hose pointing downward. Keep feeding the hose in until the nipple hits the bottom of the tank.
  6.  
  7. Place the other end of the hose in a suitable container and insert a air hose pointing it in the downward direction of the slit and inject air into the line.
  8.  

If the vehicle is to be stored, always drain the gasoline from the complete fuel system including the carburetor, fuel pump, fuel lines, and tank.

REMOVAL & INSTALLATION



See Figure 1



Click image to see an enlarged view

Fig. Fig. 1: Common fuel tank installation on models covered in this guide

  1. Drain the tank.
  2.  
  3. Jack up your vehicle and support it with jackstands.
  4.  
  5. Remove the clamp on the filler neck and the vent tube hose.
  6.  
  7. Remove the gauge hose which is attached to the frame.
  8.  
  9. While supporting the tank securely, remove the support straps.
  10.  
  11. Lower the tank until the gauge wiring can be removed.
  12.  
  13. Remove the tank.
  14.  
  15. Install the unit by reversing the removal procedure. Make certain that the anti-squeak material is replaced during installation.
  16.  
  17. Lower the vehicle.
  18.  

 
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