Nissan Stanza/200SX/240SX 1982-1992 Repair Guide

Mechanical Fuel Pump

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See Figures 1 and 2

The fuel pump is a mechanically operated, diaphragm type driven by the fuel pump eccentric on the camshaft. The pump is located on the right rear side of the cylinder head (CA20 engine).

REMOVAL & INSTALLATION




CAUTION
Never smoke when working around gasoline! Avoid all sources of sparks or ignition. Gasoline vapors are EXTREMELY volatile!

  1. Disconnect the fuel lines from the fuel pump. Be sure to keep the line leading from the fuel tank up high to prevent the excess loss of fuel.
  2.  
  3. Remove the two fuel pump mounting nuts and the fuel pump assembly from the right side of the engine.
  4.  
  5. To install, use a new gasket, sealant and reverse the removal procedures. Torque the fuel pump bolts to 79 ft. lbs. Replace the fuel line hose clamps as necessary.
  6.  



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Fig. Fig. 1: Engine fuel pump-CA20 engine series



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Fig. Fig. 2: Testing mechanical fuel pump

TESTING



Static Pressure

CAUTION
Never smoke when working around gasoline! Avoid all sources of sparks or ignition. Gasoline vapors are EXTREMELY volatile!

  1. Disconnect the fuel line at the carburetor. Using a T-connector, connect two rubber hoses to the connector, then install it between the fuel line and the carburetor fitting.
  2.  

When disconnecting the fuel line, be sure to place a container under the line to catch the excess fuel which will be present.

  1. Connect a fuel pump pressure gauge to the T-connector and secure it with a clamp.
  2.  
  3. Start the engine and check the pressure at various speeds. The pressure should be 2.83.8 psi (19.326.2 kpa). There is usually enough gas in the float bowl to perform this test.
  4.  
  5. If the pressure is OK, perform a capacity test. Remove the gauge and the T-connector assembly, then reinstall the fuel line to the carburetor.
  6.  

Capacity Test
  1. Disconnect the fuel line from the carburetor and place the line in a graduated container.
  2.  
  3. Fill the carburetor float bowl with gas.
  4.  
  5. Start the engine and run it for one minute at about 1,000 rpm. The pump should deliver 1.5 liter of volume per minute.
  6.  

 
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