Fuel Pump Replacement

Why replace your fuel pump?

The mechanical fuel pump provides fuel to the carburetor and is actuated by an eccentric on the camshaft through the rocker arm or push rod. An inlet line from the fuel tank is usually connected to the fuel pump with a flexible hose and hose clamp. The outlet line to the carburetor is normally made of steel and connected to the fuel pump with a tube fitting. You may also find a vapour return hose on some fuel pumps. Typical installations for a V-8 and in-line engines are shown.

When you replace a fuel pump, you should also install a new fuel filter. Check the flexible fuel line running from the fuel tank to the fuel pump, and replace it if it's cracked or leaking. If you replace the fuel line, you should also install a new hose.

These instructions will help you replace you car's mechanical fuel pump. Note: If your car has an electric fuel pump, consult an appropriate service manual. The system may operate under high pressure and require special service precautions. READ the service manual completely before you begin.

 

tools and equipment

To change your fuel pump you will need:

  • Ratchet wrench set with universal joint
  • Tubing or open-end wrenches
  • Hose clamp pliers or screwdriver
  • Bolt or wooden dowel to plug fuel line from fuel tank

 

before you begin

Proper maintenance and service procedures are vital to the safe, efficient operation of all motor vehicles, as well as to the safety of the person performing the work—you.

Whenever you are working on your vehicle, we recommend that you follow these important safety rules:

  • Do have a first-aid kit handy.
  • Do be careful when working around hot or sharp objects.
  • Do follow the manufacturer's instructions for all products.
  • Do use safety stands under the frame or drive-on ramps if you must raise your vehicle.
  • Don't run the engine without proper ventilation.
  • Don't smoke when working around the engine.

installation

READ these instructions completely before you begin:

Removing the Old Pump

Fuel Pump Diagram Remove the bolts

  • Disconnect the fuel tank hose at the fuel pump, and plug the hose with a bolt or wooden dowel to keep any fuel from flowing out.
  • Disconnect the outlet line to the carburetor.  
  • Use a wrench on the fuel pump fitting and another on the line nut.
  • Disconnect the two attaching bolts and remove the old fuel pump.
  • Clean off any old gasket material from the mounting surface of the engine.  

  

Installing the New Pump

 Install new pump

 Attach fuel lines and hoses

  • Coat a new fuel pump gasket on both sides with gasket sealer or gasket cement.
  • Put the attaching bolts through the new pump and slip the gasket over the bolts.
  • Install the new pump on the engine. Make sure that the rocker arm in the pump is against the eccentric inside the engine, or that the push rod is correctly installed in both the engine and the fuel pump.
  • Attach the fuel outlet line that runs to the carburetor. If it's difficult to connect, remove the other end of the line from the carburetor.
  • Connect the line to the fuel pump, and then reattach the other end to the carburetor. Use a wrench to hold the fuel pump fitting and tighten the line nut with another wrench.
  • Attach the fuel inlet hose from the gas tank, and the vapour return hose (if the vehicle is equipped with one).
  • Tighten all clamps.
  • Reconnect the battery ground cable, start the vehicle and check for leaks.

 

quick tips

  • Follow these instructions carefully. Read and be sure you understand them before you begin.
  • Gather all your tools and supplies before you begin.
  • Allow plenty of time to do the job so you don't have to hurry.
  • Remember that these are general instructions. For more detailed instructions pertaining to your specific vehicle, consult an appropriate repair manual.
  • Safety is important whenever you're working around machinery. Beware of hot objects, sharp instruments and hazardous materials.
  • Don't substitute tools unless you're sure you won't compromise either your safety or the performance of your vehicle.
  • If you have any questions about repair and maintenance, contact your local NAPA Auto Parts store. Find the nearest NAPA Auto Parts location.

 

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