Question about 2002 Daewoo Lanos

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New fuel pump.............

Dave, I'm back with more to the story! After all the troubleshooting on original fuel pump, I ended up replacing fuel pump. Now the car is running perfect except, on cold start, it struggles to fire up. Once it starts, it will restart all day long! Just installed new ignition wires, old ones were toast. One question I have is, once fuel rail, and or fuel system is pressurized, should'nt it remain pressurized. even when car is shut down, and at rest for a while? Or, does the fuel system de-pressurize after sitting a while? I have checked pressure at fuel rail service port, no pressure after shutting engine off. Anyway, the issue at hand is cold start. It will crank over fine, new battery, but will sputter to a point were it will finally start. Once started, runs great, and restarts rest of day. Does not like cold start, in Florida. You get the picture, not like its cold out here! I wonder if I might have a leaky fuel injector? Or bad fuel regulator?

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  • danomyte370 Jul 23, 2008

    One more question, could a faulty fuel regulator cause the fuel system to depressurize when the car of shut down? I'm baffled because once it starts, after struggling on a cold start, it will run great, and restart all day long.

  • danomyte370 Aug 28, 2008

    Tested for leaking injectors, did not find a leaker. I have been told that the fuel pump has a check ball that might be malfunctioning, and causing the system to depressurize. I suspect the fuel pump. I have one ordered and will go from there.



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Hi there i do believe you have a faulty or leaking injector because it should stay pressurized when you shut off the engine

Posted on Aug 28, 2008


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