Question about 1995 Saab 9000

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No fuel on fuel rail at engine,already replaced fue pump,and relay

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  • Saab Master
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Some cars, like ford and Jaguar have an inertial fuel pump cut off. I don't think Saab has one, but relies on the alternator instead. The fuel pump relay is only energized for a few seconds, unless the alternator has output. So a bad alternator will cut out the fuel pump relay. This is the way all Bosch fuel injected cars work.

Posted on Jun 01, 2010

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HARD STARTING FOR BMW 2004 X5 WITH 4.4 V8


Are there any codes set? probably a fuel problem.. check the fule pump relay.. when you turn the key the pump should run for 1.5 - 2 seconds to charge the system. Turn the key and listen for the pump running.. you may have to actually remove the gas cap open the little door in the pipe and listen there to hear it.. If you hear it .. it is working. If it is not working check the fues box and look for the relay that controlls this. several of the relays will be the same.. have someone turn the key for you and listen and feel the relays for the click, this will identify the relay for you.. mark it .. next check the fuel pressure at the fuel rail.. you will need a pressure checking guage and hose to do this (Harbor Freight very cheap) when you turn on the key you should see the fuel pressure come up.. crank the car and see what happens to the fuel pressure.. if it goes down and stays down check the fuel filter.. under car. if you bremove it to check it Blow through it and see if it is clogged..since you already have it removed replace it with a new one. good maintance. the worst thing and the most expensive would be bad fuel pumps.
I suggest you buy the Chilton Manual for your car if you intend to work on it. This engine looks very complicated when you first look at it.. after you remove the plastic covers its not so bad. Post a comment here let us know what you find.

Aug 19, 2014 | Cars & Trucks

1 Answer

Starts then dies & won't restart


check fuel pressure, should be 40 psi.
try 2 things

spray starting fluid in air intake to see if it will stay running. It's fue then.

Try turning key to on nd wait 5 seconds for system to build pressure and pump to shut off. Turn key off, wait for relay clcik noise or 10 seconds. then turn key to ON again and wait 5 seconds to build pressure again. Then start engine. If it starts better, you have a bad check valve in the fuel pump or a bad pressure regulator on the fuel rail (unlikely).

report back

Aug 22, 2011 | 2005 Ford Expedition

1 Answer

1999 range rover se changed fuel pump, truck still wont start, relays and fues look good.


why you have replaced the Fuel pump? who advised you to do so?
be guided as follow 1. on the Engine Side on the top there is a fuel rail for the injectors. turn the ign. key to the second position (on) and check the valve located on the fuel rail if fuel is coming pressurized and still won't work. then open on of the spark plugs wires and check if spark is there. (Be Careful doing that). if no spark then is there any message comes up on the Dash? if not messages then you can check the Crank Sensor if no current being generated from the ign. coils.

Jul 03, 2010 | 1999 Land Rover Range Rover

3 Answers

2000 Malibu Starts then looses fuel pressure I have replaced the fuel pump and the fuel pump relay still same problem


Keep in mind that you have several components there:
- Fuel Pump Sender Assembly,
- Fuel Pressure Regulator,
- Fuel Rail Assembly, and
- Fuel Injectors.

1.- Fuel Pump (Sender Assembly) - TESTING
Refer to the accompanying charts for fuel pump diagnosis and testing.

The fuel injection system remains under pressure, even after the engine has been turned OFF. The fuel system pressure must be relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury.

eb744a2.jpg

Fig. 3.1L engine OBD system check to be done before fuel pump relay circuit diagnosis


26456ba.jpg

Fig. 3.1L engine fuel pump relay circuit diagnosis (1 of 2)


b3b739d.jpg

Fig. 3.1L engine fuel pump relay circuit diagnosis (2 of 2)


db78a73.jpg

Fig. View of the fuel pressure test port (Schrader valve)-3.1L engine

A - 3.1L engine fuel system pressure test (1 of 4)
B - 3.1L engine fuel system pressure test (2 of 4)
C - 3.1L engine fuel system pressure test (3 of 4)
D - 3.1L engine fuel system pressure test (4 of 4)

c8a9798.jpg

Fig. The fuel pump/fuel sender module assembly is mounted in the fuel tank


2.-
Fuel Pressure Regulator - REMOVAL & INSTALLATION

(the fuel pressure regulator, which is located on the fuel rail assembly)

NOTE:
Before removing the fuel regulator assembly, place a clean shop towel under the regulator to catch any fuel drips

  1. Properly relieve the fuel system pressure.
  2. If not done already, disconnect the negative battery cable.
  3. On the 3.1L engine, remove the intake manifold plenum, as outlined in .
  4. On the 2.4L engine, remove the fuel rail. Refer to procedure earlier in this section.
  5. Detach the vacuum line from the regulator.
  6. Place a shop towel under the regulator to catch any fuel that may drip out. Unfasten the fuel pressure regulator retaining screw, then remove the regulator by twisting and pulling it from the fuel rail.
  7. Remove and discard the O-ring seal. Inspect the filter screen for contamination and replace if necessary.
To install:
  1. Prior to assembling the pressure regulator to the fuel rail, lubricate the new rail-to-regulator O-ring seal with clean engine oil.
  2. Place the O-ring on the pressure regulator and install the pressure regulator to the fuel rail.
  3. Install the retainer or coat the regulator mounting screws with an approved thread locking compound and secure the pressure regulator in place. Tighten the mounting screw to 76 inch lbs. (8.5 Nm).
  4. If removed, install the fuel rail assembly to the engine.
WARNING The fuel return pipe must be connected before tightening the regulator retaining screw to prevent the regulator from rotating. Rotation of the regulator could damage the retainer and spacer bracket and lead to a fuel leak at the regulator inlet.
  1. Connect the fuel feed line and return line to the fuel rail assembly, use a backup wrench on the fittings to prevent turning.
  2. Attach the vacuum line to the regulator.
  3. On the 3.1L engine, install the intake manifold plenum.
  4. Connect the negative battery cable. Turn the ignition to the ON position for two seconds, then turn it to the OFF position for ten seconds. Turn again to the ON position and check for fuel leaks.

continue...

May 24, 2010 | Chevrolet Malibu Cars & Trucks

1 Answer

What controls the injector pulse on a 2002 buick rendezvous?


michaelvolla,

All fuel enjected vehicles have a fuel pump relay that controls the pump action when pulling (pumping) fuel to the fuel rail.

If you are experiencing lack of fuel to the engine, chances are that the fuel pump relay needs replaced.

To determine this, answer the following:

1. Is there fuel pressure on the fuel rail after shutting the engine off (at operating temperature) one hour or more after shut off?

If so, then it may not be the relay. It could be the sending unit (fuel pump) itself, but it feul pressure is not present upon pressing the needle in under the black knob on the fuel rail; replace the fuel pump relay first. If this doesn't work, then the fuel pump may need replaced.

Please let me know if you need anymore assistance, or further questions or concerns. Also, inquire abou this with a local parts dealer, as they will also be able to help you in this matter.

The relay and pump are something that you should be able to do yourself, and not have to go to a mechanic or dealer to have replaced. Unless there is extraordinary work invloved, which I highly doubt, but is possible.

Cordially,

carsandcomps,
Guru, Premium Expert @ Fixya.com

Apr 10, 2010 | 2002 Buick Rendezvous

2 Answers

96 windstar, no power to fuel pump


The power to the fuel pump occurs for only a short time when key is on,engine off. This is to prime the fuel line. Power resumes during cranking and running. Was the power to the pump checked during these cycles or checked with key on only? Power may be present and fuel pump is not reacting. Hope this helps..

Apr 28, 2009 | 1999 Ford Windstar

1 Answer

2002 Madza 626 4cyl car will not start. Has spark


It could be: clogged fuel filter, bad fuel pump, or the cutoff switch. Could be fuel pump relay. It's in the engine compartment fues block, and labeled "Fuel Pump"

If it's either the filter or the pump, replace both at the same time, it's cheaper.

The fuel cutoff in located in the trunk, along the driver side rear fender, you have to pull all the carpeting and such out on that side to get to it. It's marked "Fuel cutoff" Not sure on the 626, you might just have to push the reset button on the module.

However I doubt this is your problem I would think it's either the relay, the filter or pump.

Mar 06, 2009 | 2002 Mazda 626

1 Answer

Not getting fuel


injector pump works when the engine is turning. to check it just have someone turn the engine while you cleck the line leading to the fuel rail

Feb 02, 2009 | 2001 Ford F350 Super Duty SuperCab

1 Answer

Cant get power to fuel shut off or to fuel pump all fues are fine


replace the fuel pump if the fuel pump cutoff switch and connector checks ok.

Nov 19, 2008 | 1995 Ford Mustang

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