Nissan/Datsun 200SX/510/610/710/810/Maxima 1973-1984 Repair Guide

Mechanical Fuel Pump

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REMOVAL & INSTALLATION





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Fig. Fig. 1 Exploded view of the fuel pump-L-series engines



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Fig. Fig. 2 Exploded view of the fuel pump-Z20S engines


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

  1. Disconnect the two 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 remove the fuel pump assembly from the side of the engine.
  4.  
  5. Install the fuel pump in the reverse order of removal, using a new gasket and sealer on the mating surface.
  6.  

TESTING




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

The fuel pump is a mechanically operated, diaphragm type, driven by the fuel pump eccentric on the camshaft. Design of the fuel pump permits disassembly, cleaning, and repair or replacement of defective parts. The fuel pump is mounted on the right side of the cylinder block, near the front.

  1. Disconnect the line between the carburetor and the pump at the carburetor.
  2.  
  3. Connect a fuel pump pressure gauge on the line.
  4.  
  5. Start the engine. The pressure should be between 3.0 and 3.9 psi. There is usually enough gas in the float bowl to perform this test.
  6.  
  7. If the pressure is ok, perform a capacity test. Remove the gauge from the line. Use a graduated container to catch the gas from the fuel line. Fill the carburetor float bowl with gas. Run the engine for one minute at about 1,000 rpm. The pump should deliver 1,000cc in a minute or less.
  8.  

 
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