96 gmc suburban 5.7 wont start when is cold

wont start until i spray carb cleaner in throutle body.after that runs fine

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What is the fuel pressure, key on engine off and key on engine running?
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fuel presure 55 pounds
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Okay, is that the pressure with the key on engine off or key on engine running?
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same presure key on and runing.
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Fuel pressure is too low.
Could be a weak pump, a leaking pressure regulator, leaking injectors, leaking pulsator.
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zayka wrote:

    Try cycling the key on and off 4 or 5 times before starting when cold.
    If this helps, first replace the fuel filter. If not, check all the fuel lines for leaks, chack the tank for leaks, ect. Charles
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