Fuel pump replacement

Tiny
LORI FORTUNA
  • MEMBER
  • 1991 MERCURY COUGAR
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 114,500 MILES
How do you replace the fuel pump and what kind do you get?
Wednesday, May 22nd, 2019 AT 9:16 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

I attached the procedure below for you to view.

The fuel tank must be removed to gain access to the pump.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Rock auto has the pump for the best price. I attached a picture below for you.

Roy

WARNING: Do not smoke, carry lighted tobacco or open flame of any type when working on or near any fuel related component. Highly flammable mixtures are always present and may be ignited, resulting in possible personal injury.

CAUTION: Fuel supply lines will remain pressurized for long periods of time after engine shut down. This pressure must be relieved before servicing of the fuel system is begun. A valve is provided on the throttle body for this purpose. Remove the air cleaner and relieve system pressure by using Rotunda pressure gauge tool T80L-9974-A or equivalent and drain the system through the drain tube.

Removal

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1. Place vehicle on hoist, do not raise.
2. Depressurize fuel system by cranking engine with fuel pump electrical connection open through use of EFI and CF Pressure Gauge Tool T8OL-9974-B or equivalent.
3. Drain fuel from tank through filler neck using Rotunda Fuel Storage Tanker 034-00002 and Adapter Hose 034-00011 or equivalent.
4. Raise vehicle on hoist.
5. Remove the exhaust pipe and exhaust shield.
6. Disconnect fuel hoses and tubes. Disconnect one end of the vapor crossover hose at the rear over the driveshaft. Disconnect filler hose.

NOTE: The plastic fuel tube connections are on top of the fuel tank and are inaccessible. The fuel tank must be lowered to gain access to the connections.

7. Place a safety support under the tank. Remove the bolts from the fuel tank straps. Take care not to deform the fuel tank, fuel tank support or straps to avoid affecting fuel tank capacity and or fuel pick-up.
8. Lower the tank and disconnect the fuel lines and electrical connector from the fuel gauge sender, if required.
9. Remove any dirt that has accumulated around the fuel pump retaining flange so that it will not enter the tank during removal and installation.
10. Turn the fuel pump locking ring counterclockwise using Fuel Tank Sender Wrench D84P-9275-A or equivalent, and remove locking ring.
11. Remove fuel pump and sender assembly.
12. Remove seal ring and discard.

Installation

1. Clean the fuel pump mounting flange and the fuel tank mounting surface and seal ring groove.
2. Apply a light coating of Long Life Lubricant Cl AZ-i 9590-BA (ESA-M1C75-B) or equivalent on a new seal ring to hold it in place during assembly and install in fuel ring groove.
3. Install fuel pump and sender assembly carefully to ensure that filter is not damaged. Ensure locating keys are in keyways and seal ring remains in groove.
4. Hold pump assembly in place and install locking ring finger- tight. Ensure that all locking tabs are under tank lock ring tabs.
5. Secure the fuel pump unit with the locking ring by rotating clockwise using Fuel Tank Sender Wrench D84P-9275-A or equivalent, until ring stops against stops.
6. Connect fuel hoses and tubes. Position fuel tank and secure with retaining straps.
7. Connect filler hose.
8. Connect exhaust pipe.
9. Lower vehicle.
10. Install a minimum of 38 liters (10 gallons) of fuel and check for leaks.
11. Install Fuel Pressure Gauge T8OL-9974-B or equivalent on the fuel charging assembly fuel diagnostic valve. Turn ignition switch from OFF to ON position for three seconds. Turn ignition switch for three seconds repeatedly (5 to 10 times) until pressure gauge shows at least 241 kPa (35 psi). Check for leaks at fittings.
12. Remove pressure gauge, start engine, and check for leaks.
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Wednesday, May 22nd, 2019 AT 1:23 PM

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