Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Bleeding The System

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See Figures 1, 2, 3, 4 and 5



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Fig. Fig. 1: To bleed air from the system on early style pumps, loosen the priming pump vent screw and operate the priming pump



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Fig. Fig. 2: To bleed air from the system on late style pumps, loosen the priming pump vent petcock and operate the priming pump



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Fig. Fig. 3: Operate the priming pump until no air bubbles are seen at the vent screw



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Fig. Fig. 4: Fuel filter housing component identification



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Fig. Fig. 5: Check the priming pump operation, by connecting a hose to the priming pump, as shown

Air should be bled out of the fuel system when the injection pump is removed or the fuel system is repaired. This is also required if the fuel tank has been completely emptied.

  1. Loosen the air vent screw or cock.
  2.  
  3. Move the priming pump up and down until no further air bubbles come out of the air vent screw or cock, then tighten the air vent screw or cock.
  4.  
  5. Disconnect the fuel hose from the from the filter, on the injection pump side. Then install a suitable hose on the to the priming pump side.
  6.  
  7. Prime the priming pump to make sure that a fuel flows from the hose. If it does not check the priming pump operation as follows:
    1. Close the bleeder screw.
    2.  
    3. Make certain the fuel filter is completely filled with fuel.
    4.  
    5. With the hose connected as stated above, pump the priming pump. Fuel should flow from the hose. If it does not, replace the priming pump and retest.
    6.  

  8.  

If the engine does not operate smoothly after it has started, race it two or three times. If the engine does not start, loosen the injection tubes at the nozzle side and crank the engine until fuel overflows from the injection tubes. Tighten the injection tube flare nuts.

 
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