Where's the fuel pump - 1986 Oldsmobile Cutlass Supreme

Yes , of course it does . all vehicles have them .
The fuel pump is an electric pump that is controlled by the powertrain control module through the fuel pump relay. When the PCM commands the fuel pump to operate, an impeller is driven by an electric motor in the pump assembly. The pump impeller causes the fuel in the tank to be drawn into the fuel pump inlet port. The fuel is then pumped out under pressure through the fuel feed pipe and hoses to the fuel rail and the fuel injectors. The fuel pressure is maintained when the fuel pump is not running by a pressure control valve located within the pump. Excess fuel is returned to the fuel tank by the fuel return pipe and hoses. The fuel pump is located in the fuel tank and is a part of the fuel sender assembly. The fuel sender assembly has to be removed from the fuel tank in order to inspect or replace the fuel pump.

Fuel Pump Flow Control Module (FPCM) - LMF
The fuel pump flow control module (FPCM) is a serviceable GMLAN module. The FPCM receives the desired fuel pressure message from the engine control module (ECM) and controls the fuel pump located within the fuel tank to achieve the desired fuel pressure. The FPCM sends a 25 KHZ PWM signal to the fuel pump, and pump speed is changed by varying the duty cycle of this signal. Maximum current supplied to the fuel pump is 15 amps. A liquid fuel pressure sensor provides fuel pressure feedback to the FPCM.
Electronic Returnless Fuel System (ERFS) - LMF
The electronic returnless fuel system is a microprocessor controlled fuel delivery system which transports fuel from the tank to the fuel rails. It functions as an electronic replacement for a traditional, mechanical fuel pressure regulator. A pressure vent valve within the fuel tank provides an added measure of fuel pump flow control module (FPCM). Desired fuel pressure is commanded by the engine control module (ECM), and transmitted to the FPCM via a GMLAN serial data message. A liquid fuel pressure sensor provides the feedback the FPCM requires for Closed Loop fuel pressure control.

Fuel Pump Flow Control Module (Gas except LU3/LMG/LY6/LC9)
Mounted to the rear frame, near the spare tire mount
Wheels/Vehicle Underbody Component Views
Component Connector End Views
Fuel Pump Relay - Secondary (Gas with LY6)
On the fuse block - underhood bracket

DTC P0191: Fuel Rail Pressure (FRP) Sensor Performance
DTC P0192: Fuel Rail Pressure (FRP) Sensor Circuit Low Voltage
DTC P0193: Fuel Rail Pressure (FRP) Sensor Circuit High Voltage
DTC P0230: Fuel Pump Relay Control Circuit
The engine control module (ECM) sends the fuel enable signal to the fuel pump control module (FPCM). The control module monitors the voltage on the fuel pump relay control circuit. If the control module detects an incorrect voltage on the fuel pump relay control circuit, a fuel pump relay control DTC sets.
The control module monitors the voltage on the fuel pump relay control circuit. If the control module detects an incorrect voltage on the fuel pump relay control circuit, a fuel pump relay control DTC sets.
DTC P0231: Fuel Pump Control Circuit Low Voltage
DTC P0232: Fuel Pump Control Circuit High Voltage
DTC P023F: Fuel Pump Control Circuit
DTC P025A: Fuel Pump Control Module Enable Circuit

Your best bet , take it to a qualified repair shop , dealer .

You must remove the fuel tank to replace the fuel pump.

1. Remove fuel tank.
   
2. Remove any dirt that has accumulated around fuel pump module retaining flange.
   
3. Turn fuel pump module locking retainer ring (#1)counterclockwise using Fuel Tank Sender Wrench 310-D006 and remove fuel pump module locking retainer ring.
   
4. Pull fuel pump module sender plate up out of fuel tank until locking tabs(#3) for fuel pump module are accessible. Reach through fuel pump module opening, squeeze both locking tabs together and remove fuel pump module from fuel tank.

drop the fuel tank and remove the circle lock. Youll see it when you take the cover off.

It could be fuel pump or fuel pump relay.Click here to see how to remove fuel pump.Click here to see fuel pump.See how much the fuel pump is,make sure it's that.Here's the fuel pump relay.Here's how to remove fuel pressure.

SPECIAL SERVICE TOOL(S) REQUIRED Description Tool Number Multi-Port Fuel Injection (MFI) Fuel Pressure Gauge T80L-9974-B
Removal

1. Depressurize fuel system as outlined in Service Procedures- Fuel System Pressure Relief.
   

1. Remove rear seat cushion. Refer to Section 01-10.
   

1. Remove plastic grommet from floor pan.
   

1. Disconnect fuel pump module electrical connector.
   

1. NOTE: To disconnect fuel tubes from fuel pump module, compress tabs on both sides of each nylon push connect fitting and ease fuel tube out of fuel pump module.
   
   Disconnect fuel and vapor return tubes from fuel pump module.
   

1. Turn fuel pump locking retainer ring counterclockwise using Fuel Tank Sender Wrench D84P-9275-A or equivalent and remove fuel pump locking retainer ring.
   

1. NOTE: After fuel pump module removal, immediately cover fuel pump module opening in fuel tank in order to prevent fuel system contamination.
   
   Remove fuel pump module and cover fuel pump module opening in fuel tank.
   

1. Remove fuel pump module O-ring seal and discard.
   

Installation

1. NOTE: When cleaning fuel pump module mounting surface on fuel tank, use caution to prevent any foreign material from entering fuel system.
   
   Clean fuel pump module mounting flange and fuel pump module mounting surface and O-ring seal groove on fuel tank.
   

1. Apply a light coat of Premium Long-Life Grease XG-1-C, -K or equivalent meeting Ford specification ESA-M1C75-B on a new O-ring seal to hold it in place and install it into the O-ring seal groove on the fuel tank.
   

1. Install fuel pump module carefully to ensure that filter is not damaged. Make sure that locating keys are in keyways and O-ring seal remains in place.
   

1. Hold fuel pump module in place and install fuel pump locking retainer ring finger-tight. Make sure that all locking tabs are under fuel tank lock ring tabs.
   

1. Secure fuel pump locking retainer ring by rotating clockwise using Fuel Tank Sender Wrench D84P-9275-A or equivalent until fuel pump locking retainer ring rests against stops.
   

1. Connect fuel and vapor return tubes to fuel pump module.
   

1. Connect fuel pump module electrical connector.
   

1. Install plastic grommet in floor pan.
   

1. Install rear seat cushion. Refer to Section 01-10.
   

1. Install Multi-Port Fuel Injection (MFI) Fuel Pressure Gauge T80L-9974-B as outlined in Service Procedures-Fuel System Pressure Relief.
   

1. Turn ignition switch to RUN position for three seconds repeatedly (5 to 10 times) until pressure gauge reads at least 270 kPa (30 psi). Check for leaks at fittings.
   

1. Remove pressure gauge, start engine and recheck for leaks.
   

Hope this helps

Removal & Installation
Through the trunk servicing panel...

1. Before servicing the vehicle, refer to the Precautions section.
   
2. Properly relieve the fuel pressure.
   
3. Remove or disconnect the following:
   
   • Negative battery cable
     
   • Rear package trim
     
   • Service hole cover
     
   • Fuel pump cover
     
   • Fuel pump connector
     
   • Fuel hoses
     
   • Fuel pump and gauge sender unit as an assembly
     
   • Fuel pump from the sender bracket
     

To install:

• New O-ring set
  
• Fuel pump to the sender bracket
  

NOTE

Pull the fuel pump down so that it is tight against the bracket.

• Fuel pump and gauge sender unit as an assembly
  
• Fuel hoses
  
• Fuel pump connector
  
• Fuel pump cover
  
• Service hole cover
  
• Rear package trim
  
• Negative battery cable
  

For 1996 Pontiac Truck Trans Sport 3.4L SFI 6cyl check this procedure for Fuel Pump... there are two different electric fuel pumps used:
- A medium pressure twin turbine pump for vehicles equipped with Throttle Body Injection (TBI). - A high pressure roller vane pump for vehicles equipped with Sequential Fuel Injection (SFI).
(see Figure 1)





Fig. 1: View of the fuel pump assembly and related components
The fuel pump is mounted to the fuel sender assembly inside the fuel tank. The fuel is pumped to the engine at a specified flow and pressure by the fuel pump. Excess fuel is returned to the fuel tank by the return pipe. The fuel pump delivers a constant flow of fuel to the engine even during low fuel conditions and aggressive vehicle maneuvers.

CAUTION When working on or near the fuel tank, be sure to observe the information molded on the bottom of the tank.
Removal & Installation

1. Disconnect the negative battery cable.
2. Properly relieve the fuel system pressure.
   

(see Figure 2)




Fig. 2: Exploded view of the fuel pump-to-tank mounting components

1. Drain and remove the fuel tank.
2. Remove the fuel sender assembly.
3. Disassemble the fuel pump strainer and the fuel pump: Note the position of the strainer in relation to the pump.
   

(see Figure 3)





Fig. 3: Remove the fuel tank locking ring with a non-sparking (brass) punch.

1. Support the fuel pump in one hand, and grab the strainer in the other hand.
   1. Rotate strainer in one direction and pull off pump. Discard strainer.
      

(see Figure 4)





Fig. 4: Exploded view of the fuel pump components

1. Remove deflector.
   

1. Disconnect the fuel pump electrical connector.
2. Loosen the two connecting clamps, if equipped.
3. Place the fuel sender assembly upside down on the work bench.
   1. Pull the fuel pump downward to remove it from the mounting bracket, then tilt the pump outward and remove it from the connecting hose or the fuel pulse dampener.
      
4. It is recommended to replace the hose and clamps, if equipped.
   

CAUTION Do not run the pump unless submerged in fuel
To install:

1. Push the fuel pump assembly into the attaching hose. Attach the pump electrical wires and fasten the hose clamps to the attaching hose and around the pump body, where equipped.
2. Place the fuel tank sender and pump assembly into the fuel tank. Use a new O-ring seal during assembly.

Hope this help (remember rated this).

replace engine control module