Question about 1988 Volvo 740

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Car will crank but cuts out at road speed

I replaced the tank fuel pump, checked high pressure fuel pump, cleaned the lines, cleaned the tank, replaced old filter, and yet, my 1990 Volvo 740 Turbo still will not run at road speeds. I dont know what to do now, any suggestions?

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  • pccaddie May 29, 2009

    I had a mechanic to drive it and he said that it seemed like it was not getting gas and that it was tryin to cut out at road speeds.


  • pccaddie Jun 03, 2009

    Fixed the problem with the 1990 Volvo with turbo...not enough fuel pressure...high pressure fuel pump was not putting out enough pressure....thank you for your help...might help others to know all this...thank you



    pccaddie

  • yadayada
    yadayada May 11, 2010

    how do u know this is a fuel pressure problem?? this sounds like an ignition system problem.

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Sounds like a Mass air flow sensor to me.

Posted on May 29, 2009

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Change the air flow meter

Posted on May 29, 2009

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Hii have problem with my volvo 1988 gl because do not start the engine Icheck the computer and is good i need information about what you think about....
thanks charly

Posted on Aug 29, 2010

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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

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High fuel pressure indicates problems with the fuel pressure regulator. Refer to the service manual for regulator diagnosis. Do not replace the fuel pump for high pressure.
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Same problem with my 85 F-150 5.0 EFI---turned out that the fuel pump relay under the hood was teriffically corroded on the inside (I opened up the relay to look inside). When I checked the voltage at the fuel pump it would show 3.5-6 volts instead of 12 volts.

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Changing the green fuel pump relay fixed the problem--12 volts now at the pump and no reoccurance.

Good luck--let me know if this fixed your F-150.

riippa@aol.com

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