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I have a TBI on my Chevy and when I turn the key on it keeps running the fuel pump after the 2 seconds like to know what to look for and where to find it

TBI on a Chevy 5.7 liter fuel pump don't shut off after key turned onto on what would cause it my injectors keep pumping fuel with key just the on position

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Do you mean the pump keeps running after you turn key OFF? You said ON twice, but if the key is in the ON position, engine not started, the pump is supposed to run until start/run pressure is achived on the back side of the two injectors in a Chevy TBI (89-97). If it keeps running, the fuel pressure sensor is bad or has bad wires (rats love them).
If the pump keeps running after you turn the key OFF and floods the engine, then you might have a bad ignition switch, a bad PCM, or a wiring problem. None of those is cheap to repair or fast to diagnose. Good luck.

Posted on Apr 16, 2017

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Didnt specify year model or engine --generic answer --if the tbi is flooding ---check the fuel pressure regulator --and the tbi itself

Posted on Apr 16, 2017

Testimonial: "It's on an 85 Chevy K10 pickup the ECM smart computer that I put in aftermarket to run that 5.7 liter I rebuilt the TBI and replaced it with everything brand new. after the 2 second with the key on it keeps pumping Fuel and floods the motor what would cause this"

  • john h Apr 16, 2017

    can be ecm gone bad rare usual bad connection or connection problem --pressure regulator damaged --or need a tbi rebuild

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Hello Jesse,

What does not shut off?
And what are you referring to when you say "the 2 second or 3 second turn on.

Please clarify your issue and include some more information on your K10 model and engine.

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The relay may not be working or the check valve in the pump may be letting fuel back into the tank which would cause the pressure to drop to zero when the engine is off. You should have at least 15psi with a TBI system and 35psi with MFI.

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Kent, That sounds like normal operation.....see this link (https://www.justanswer.com/chevy/0z9bu-fuel-pump-relay-located-1987-chevy-silverado.html) The ECM shuts the pump down if the engine doesn't begin running in two seconds. I would bleed out the fuel line up to the TBI...crack the line at the TBI then cycle the key a couple of times until you see gas coming out of the line at the TBI. That will ensure you have fuel at the TBI, then try to start the engine. See the link for additional info.

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What you need to do is use a test light and while someone is turning the key to start the vehicle check for power to the fuel pump.If there is power there then the fuel pump is probably not putting out enough pressure.You will need to replace it.As far as the plug I am not sure where it plugs into.Does it look like it was ever hooked up before?Do you hear the pump run for 2 seconds when you turn the key to start?You should have power at the terminal E on the fuel pump relay.It goes to the fuel module then the pump if you have a 5.7 motor only.If no power to pump then you need to find the open circuit other wise if you have power then you will need to replace the pump.Hope this helps and let me know if you need any more help.Good luck.

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