Question about 1990 Lexus LS 400

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I have a 1990 ls400 lexus and is having problems with the fuel system,i changed the fuel pump and it still is not getting enough pressure to the engine when in drive,but when in park the rpm rev up as if it is receiving gas.PLEASE HELP....

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  • RHONDA STEWART Feb 07, 2010

    my mechanic said that i needed a fuel pump but after he put it on it still was acting the same way so we took it to the dealership and they stated that it was the fuel pump again leaving me to believe the fuel pump was defective so i had him take it out and i took it back to b exchanged and when he put it back n he said that it was still doin the same thing as before is there something else that could b done?

  • RHONDA STEWART Feb 07, 2010

    i took it to the dealership and they said that it was the fuel pump but the fuel pump was jus changed a week prior so it lead me to believe the fuel pump was defective so i took it back and got a brand new 1 and now its still acting the same is there something else that could b done? or checked?

  • RHONDA STEWART Feb 07, 2010

    yes i changed spark plugs,crank sensor fuel pump and distibetor cap and wires,rotors and it still is actting the same...

  • RHONDA STEWART Feb 07, 2010

    and i already changed the fuel fliter,plugs,wires,distiberter cap,the crank sensor is there something else i can check r have done?

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  • 426 Answers

How did you verify fuel pressure, also what was fuel pressure?

Posted on Feb 07, 2010

  • Xander  Kravitz
    Xander Kravitz Feb 07, 2010

    well you need to check fuel pump pressures to verify. also the fuel filter could be a problem, fuel injectors, spark plugs alot of things, this is why we need to start with basics and verify these things

  • Xander  Kravitz
    Xander Kravitz Feb 07, 2010

    what is the fuel pressure at the rail...... i really need to know before we could go anywhere

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