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How i can pressure on pump - Cars & Trucks

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  • Cars & Trucks Master
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Which pump, which system and what pressure? It would help if you give some details of the actual problem.

Posted on May 06, 2013

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Posted on Jan 02, 2017

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I have 2008 GMC sierra 5.3 L with a new fuel pump. And no power to the pump. Any ideas where to look?


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 .

Mar 25, 2017 | GMC Cars & Trucks

1 Answer

Holden Cruze Diesel low fuel pressure. High pressure pump replaced. Low pressure pump working fine Very little fuel coming out of high pressure pump outlet


!st of all unless you have the experience and the correct tools do not play with the high pressure side of the fuel system. The pressure that is created on the high side is such that will cause serious damage or fatility "Seriously". The system needs to be sealed for the pressure to occure if air is in system" no" presssure.
If lift pump is working(can you hear it?) Is it exiting fuel filter and arriving at inlet of high presure pump at correct pressure. (if not replace filter Use Genuine part. If still no good lift pump or power and earth suspect check. Any engine check lights on? if so use a code reader.(im assuming no light as you haven't mentioned it). If all is good to high pressure pump then you are looking from pump onward. Is this an issue that has just occured or have you purchased vehicle in this condition. Any unusal noises The high pressure pump is driven by camshaft is it actually turning the pump I have come across fractured cams or drives. if ok advise holden to check from here on there may be an electrical issue or injection issue possibly allowing air in system or shutting the pump down. You can check the whole sytem for visible leaks and vacuume connections. good luck.

Mar 03, 2017 | Holden Cars & Trucks

1 Answer

Where is fuel pump relay on 2009 gmc acadia


Your vehicle has no fuel pump relay . Has a fuel pump flow control module .
Fuel Pump Flow Control Module (FPCM)
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 PWM signal to the fuel pump, and pump speed is changed by varying the duty cycle of this signal.
Plus it has two fuel pumps !
The high pressure fuel pump (9) is a mechanical one cylinder design driven by an eccentric on the exhaust camshaft (1) of bank 2. High pressure fuel is regulated by the fuel rail pressure (FRP) regulator, which is a part of the high pressure fuel pump. The FRP regulator is a magnetic actuator which controls the inlet valve of the high pressure pump. The ECM provides battery voltage on the actuator high circuit and ground on the actuator low reference circuit. Both circuits are controlled by the ECM. When the ECM deactivates the FRP regulator, both circuits are disabled and the inlet valve is held open with spring pressure. When the ECM activates the FRP regulator, the low circuit driver connects the low reference circuit to ground and the high circuit driver pulse-width modulates (PWM) the high circuit. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the FRP regulator with the position of the eccentric on the camshaft. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail. The high pressure fuel pump also contains an integrated pressure relief valve.
Your best bet is have it towed to the dealer , you don't want to mess with the high pressure pump .
Pluse

Feb 27, 2016 | 2009 GMC Acadia SLT-2

1 Answer

Computer show the engine oil pressure not enough need to stop engine how to improve


Generally low oil pressure is due to a failing oil pump. If you have a mechanical gauge you can pull the electric oil pressure sensor and use that gauge there to verify if the pump is bad. If pressure is low on the mechanical pump then the pump is bad. If the mechanical pump reads good pressure then its the pressure sensor that is bad.

Apr 02, 2015 | Cars & Trucks

2 Answers

How do I change the fuel pump in a 2009 GMC Acadia


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

Feb 03, 2015 | GMC Cars & Trucks

1 Answer

My low pressure fuel pump on my e270cdi cut out under high load conditions.no pressure from the rear.all fault codes tell me the rail pressure is to low


Fuel pump relay is in cavity A in the rear SAM ( Signal Acquisition Module.) on the left hand side of the trunk behind a door.

When did you check the voltage..... you must read it while cranking or you will get a zero voltage reading.. The low pressure tank pump builds pressure to the high pressure pump and then shuts down until a pressure drop is sensed in the low pressure line and it then starts up again.

If rail pressure is too low, it often is the high pressure pump in the engine or the relief valve in the fuel rail. The tank pump is low pressure just to stop the tandem pump from cavitating by sucking too hard.

Mercedes can check the rail pressure and do an injector pressure drop to rule out a leaking injector.

If the tank pump is bad it will require replacement.

Oct 20, 2013 | Mercedes-Benz Cars & Trucks

1 Answer

How do I check the fuel pressure on a 2000 model mazda millenia with a 2.3 engine in it


Hi.

You connect a fuel pressure gauge like this to the pressure rail. Pressure in this car must be between 35 and 45 psi. If pressure is too low look for kinked fuel lines and eventually replace the pump. If the pressure drops down more than 10 psi in five minutes or if the pressure is considerably higher than that replace the fuel pressure regulator. Below the parts that may need testing:

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1. Fuel tank
2. Shut-off valve
3. Non-return valve
4. Fuel pump
5. Fuel pump (Transfer)
6. Fuel filter (High-pressure)
7. Injector
8. Pressure regulator
9. PRC solenoid valve
10. Fuel pump relay
11. Fuel pump resistor and relay (KJ model)

Aug 04, 2011 | 2000 Mazda Millenia

1 Answer

Steps replacing a 1985 grand marquis fuel pump for first time alone thanks


See Figure 1
Two different electric fuel pump configurations were used on fuel injected models. One consists of a low pressure in-tank boost pump in conjunction with an external, frame-mounted high pressure pump. The low pressure pump is used to provide pressurized fuel to the inlet of the high pressure pump and helps prevent noise and heating problems. System pressure is controlled by a pressure regulator mounted on the engine.
The other configuration consists of an in-tank high pressure pump which does not utilize a boost pump.


0900c15280053dd7.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: Disassembled electric fuel pump


REMOVAL & INSTALLATION

In-Tank Pump
See Figures 2, 3 and 4

  1. Disconnect the negative battery cable.
  2. Depressurize the system and drain as much gas from the tank by pumping out through the filler neck.
  3. Raise and support the rear end on jackstands.
  4. Disconnect the fuel supply, return and vent lines at the right and left side of the frame.
  5. Disconnect the wiring to the fuel pump.



0900c15280053dd8.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: Low pressure in-tank electric fuel pump


0900c15280053dd9.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 3: High pressure in-tank fuel pump


0900c15280053dda.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 4: Removal of electric fuel pump

  1. Support the gas tank, loosen and remove the mounting straps. Remove the gas tank.
  2. Disconnect the lines and harness at the pump flange.
  3. Clean the outside of the mounting flange and retaining ring. Turn the fuel pump lock ring counterclockwise and remove.
  4. Remove the fuel pump.

To install:
  1. Clean the mounting surfaces. Put a light coat of grease on the mounting surfaces and on the new sealing ring. Install the new fuel pump.
  2. Installation is in the reverse order of removal. Start the vehicle and check electric fuel pump operation. Check for fuel leaks.

High Pressure External Pump
See Figure 5
  1. Disconnect the negative battery cable.
  2. Depressurize the fuel system.
  3. Raise and support the rear of the vehicle on jackstands.
  4. Disconnect the inlet and outlet fuel lines.
  5. Detach the electrical harness connection.
  6. Bend down the retaining tab and remove the pump from the mounting bracket ring.
  7. Install in reverse order. Make sure the pump is indexed correctly in the mounting bracket insulator. Start the vehicle and check electric fuel pump operation. Check for fuel leaks.



0900c15280053ddb.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 5: High pressure external fuel pump

Feb 12, 2011 | 1985 Mercury Grand Marquis

1 Answer

My fuel pressure is not holding how do i know if it's my fuel pressure regulator or fuel pump


MEASURE FUEL PUMP PRESSURE AT FUEL FILTER CONNECTOR. ATTACH PRESSURE GUAGE TO FITTING COMING FROM TANK. MAKE SURE THER ARE NO LEAKS FIRST THEN HAVE SOMEONT TURN THE IGNITION ON CK. GUAGE PRESSURE TURN KEY OFF PRESSURE SHOULD REMAIN CONSTANT SINCE PUMP IS DEAD HEADED ( NO RELIEF/ REGULATOR) IF PRESSURE FALLS ,PUMP INNER CK VALVE IS LEAKING. IF PRESSURE DOES NOT FALL THEN SUSPECT REGULATOR

Aug 06, 2010 | 2001 Pontiac Firebird

1 Answer

How to r&r powersteering pump 1998 mercury grand marquis


Hopfully this will be ALL you need Besides Pulley REMOVAL TOOL It can be Rented @ AutoZONE

REMOVAL
  1. Remove drive belt.
  2. Raise vehicle on hoist. WARNING: TURN AIR SUSPENSION SWITCH (LOCATED IN LUGGAGE COMPARTMENT) OFF TO PREVENT VEHICLE DAMAGE OR PERSONAL INJURY.
  3. Remove power steering pressure hose bracket.
  4. Disconnect electrical connector at power steering control valve actuator.
    1. Install Steering Pump Pulley Remover T69L-10300-B on the pulley hub. CAUTION: Do not apply in-and-out pressure on the power steering pump shaft. Pressure will damage the internal thrust areas.
    2. Hold the small hex-head and rotate the tool nut counterclockwise to remove the power steering pump pulley.
    3. Disconnect power steering pressure hose at power steering pump and drain fluid into a container.
    4. Disconnect power steering return hose at power steering pump and drain fluid into a container.
    5. Remove four retaining bolts and power steering pump and power steering pump pulley assembly.
    6. Remove power steering pressure switch from pump.
    INSTALLATION
    1. Position the power steering pump on the mounting bosses of engine block and install the bolts at the side of the power steering pump. Tighten to 20-30 Nm (15-22 ft. lbs.).
    2. Connect the power steering reservoir pump hose to the power steering pump and reposition the hose clamp to power steering pump inlet fitting.
    3. Replace power steering pressure hose O-ring.
    4. Install the power steering pressure hose to the power steering pump fitting. Tighten the tube nut with a tube nut wrench rather than with an open-end wrench. Tighten to 34-46 Nm (26-33 ft. lbs.). NOTE: Swivel or end play of the power steering pressure hose end is normal and does not indicate a loose fitting.
    5. Place the power steering pump pulley on the power steering pump shaft and install Power Steering Pump Pulley Replacer T91P-3A733-A. The small diameter threads on the tool should be engaged in the power steering pump shaft. CAUTION: Do not apply in and out pressure on the shaft. Pressure will damage the internal rotating group.
    6. Hold the small hex-head and rotate the tool nut clockwise to install the power steering pump pulley on the shaft. CAUTION: Do not apply in and out pressure on the shaft. Pressure will damage the internal rotating group. NOTE: The power steering pump pulley face must be flush within 0.25 mm (0.010 inch) of the end of the pump shaft.
    7. Remove the Power Steering Pump Pulley Replacer T91P-3A733-A.
    8. Remove the shipping tube nut from power steering pump housing prior to installation.
    9. Connect electrical connector to power steering control valve actuator.
    1. Install power steering pressure hose bracket.
    1. Lower the vehicle.
    2. If equipped, turn the air suspension ON.
    3. Install drive belt on the power steering pump pulley.
    4. Fill the power steering pump reservoir with Power Steering Fluid Motorcraft MERCON(r) ATF.

Oct 04, 2009 | 1998 Mercury Grand Marquis

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