Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

Fuel pump speeds

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Old Sep 27, 2012 | 09:43 PM
  #1  
5.0LETR's Avatar
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From: Bremerton, Wa.
Car: 87 Iroc, 73 Camaro, 98 RS
Engine: 350, 572 eventually, V6
Transmission: 700R4, T56, Auto
Axle/Gears: 3.73, TBD, Stock
Fuel pump speeds

With all of you guys help, I have wired my fuel pump after having removed my computer from my car. My new question is, does the ECM regulate the fuel pump speeds according to the demands of the motor? I see on the wiring diagram, the tan/wht wire running into the ECM says fuel pump control, what does that mean? When I turn on the fuel pump it sounds like it is running much slower than I'm used to hearing. Thanks again for any help you guys offer.
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Old Sep 27, 2012 | 11:48 PM
  #2  
vetteoz's Avatar
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: Fuel pump speeds

Originally Posted by 5.0LETR
does the ECM regulate the fuel pump speeds according to the demands of the motor?
No , all the ECM can operate is the pump relay to turn the pump off and on;
the ECM controls the fueling though it's operation of the injectors

Originally Posted by 5.0LETR
on the wiring diagram, the tan/wht wire running into the ECM says fuel pump control,
The wire to the ECM allows the ECM to monitor the voltage going to the pump
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Old Sep 28, 2012 | 07:32 AM
  #3  
afremont's Avatar
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Car: 90 IROC
Engine: 5.7 TPI
Transmission: 4L60
Axle/Gears: 3.23
Re: Fuel pump speeds

Originally Posted by vetteoz
The wire to the ECM allows the ECM to monitor the voltage going to the pump
You don't happen to know why do you? They ran a long wire just to measure voltage drop of the pump wire, yet they run the pump continually and let the pressure regulator take care of everything. Why do they want the ECM to know the voltage drop to the pump?
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Old Sep 28, 2012 | 03:25 PM
  #4  
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Car: '91 Z28 convertible
Engine: TPI
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Axle/Gears: 3.27 posi disc
Re: Fuel pump speeds

The ECM does not care about the voltage "drop" on the fuel pump. It simply tries to detect whether the voltage is present or not and throws an error code if there is no voltage on the fuel pump after the ECM has commanded it on.
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