GM Cadillac 1967-1989 Repair Guide

DRAINING THE TANK

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If the car is to be stored for any extended length of time, the fuel should be drained from the complete system, including carburetor, fuel pump, all fuel lines, and the fuel tank in order to prevent gum formations and poor engine performance.

  1. Have a carbon dioxide fire extinguisher near the work area. Remove the negative battery cable from the battery.
  2.  
  3. Use a hand-operated siphon pump, and follow the manufacturer's instructions for its use. As the fuel tank has a restrictor in the filler neck, connect the drain hose to the main fuel pipe at the fuel pump or at the tank gauge unit. Drain the fuel.
  4.  
  5. Reconnect any removed hoses, lines and cap.
  6.  


CAUTION
Never drain or store gasoline in an open container due to the possibility of fire or explosion. Never siphon gasoline by mouth!

TANK REMOVAL & INSTALLATION



See Figures 1 and 2

  1. Drain tank.
  2.  
  3. Disconnect tank unit wire from connector in rear compartment.
  4.  
  5. Remove the ground wire retaining screw from the underbody.
  6.  
  7. Disconnect the hoses from the tank unit.
  8.  
  9. Support the fuel tank and disconnect the two fuel tank retaining straps.
  10.  
  11. Remove the tank from the car.
  12.  
  13. Remove the fuel gauge retaining cam, and remove the tank unit from the tank.
  14.  
  15. Installation is the reverse of removal. On California emissions-equipped cars, center the fuel filler pipe in the opening as required. Always replace the O-ring when the tank unit has been removed.
  16.  



Click image to see an enlarged view

Fig. Fig. 1: Common fuel tank mounting



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Fig. Fig. 2: Installing a fuel gauge unit into the fuel tank

 
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