ECM Fuel Pump Control - Page 2 - Chevelle Tech
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post #16 of 23 (permalink) Old Mar 11th, 19, 8:25 AM Thread Starter
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Geoff
 
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Re: ECM Fuel Pump Control

Looking for a quieter pump...
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post #17 of 23 (permalink) Old Mar 11th, 19, 10:11 AM
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Ed
 
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Re: ECM Fuel Pump Control

I cannot hear my intank pump at all when running, I can barely hear it when key is turned on before starting. I have a plastic tank from a Roadmaster Wagon, and a factory style replacement drop in pump. The differences in that video by Hotwire are impressive, and what I would expect one to sound like in tank. (unless in a metal tank that was near empty, I could understand that being loud echoing around in the metal tank.)

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post #18 of 23 (permalink) Old Mar 11th, 19, 11:15 AM
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Re: ECM Fuel Pump Control

Quote:
Originally Posted by andrewb70 View Post
To clarify, the statement above is not correct. The GMPP harness doesn't have a connector on it for oil pressure. Thus, the ECU does not monitor oil pressure.

When the key is turned to RUN, the fuel pump primes for 5 seconds (maybe 4). If there is no crank signal present, the pump will shut off. Once there is a signal from the crank sensor (RPM) the fuel pump is turned on and will continue to stay on as long as the RPM signal is present.

Andrew
Sorry for the misinformation. Back in the day GM used to prime the fuel pump off the ECM (only ECM interaction w/ fuel pump) then had the fuel pump wired into the oil pressure sensor, no oil pressure, no fuel pump, mainly TBI/90's LT1 setups. They then ran the oil pressure sensor to the ECM and used it to kill the engine if no pressure. As of late I guess GM got away from trying to preserve the engine by way of monitoring oil pressure.

I've got an '05 LS ECM, it monitors oil pressure, I datalog it every trip.

*Jeff*

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post #19 of 23 (permalink) Old Mar 11th, 19, 12:26 PM
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Re: ECM Fuel Pump Control

GM systems used the ECM to turn on the fuel pump relay. It turned on the relay for 2 sec. with key on. If cranking RPM is seen the ECM keeps the relay on. The oil press. Switch also supplies power to the fuel pump independent of the relay. So if the relay was defective it would stop the pump & turn off the engine.
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post #20 of 23 (permalink) Old Mar 17th, 19, 7:20 PM
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Re: ECM Fuel Pump Control

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Originally Posted by Geoff1200 View Post
Looking for a quieter pump...
DW200, as stated before and shown in my video.

Andrew


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post #21 of 23 (permalink) Old Mar 17th, 19, 10:32 PM
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Re: ECM Fuel Pump Control

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Originally Posted by 1967 chevelle malibu View Post
The oil press. Switch also supplies power to the fuel pump independent of the relay. So if the relay was defective it would stop the pump & turn off the engine.

I don't think so. My '03 truck's 5.3 had an oil pressure issue. In gear stopped at a light, pressure would drop to zero and I'd hear the rockers clacking. The dash would light up and I'd see a message SHUT ENGINE NO OIL PRESSURE.


But it never shut itself off.

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post #22 of 23 (permalink) Old Apr 30th, 19, 9:40 PM
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Re: ECM Fuel Pump Control

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Originally Posted by paul bell View Post
Vaporworx offers a PWM fuel pump controller that works off fuel pressure. It greatly reduces the current the fuel pump uses, which reduces fuel heating, and ramps it up as the pressure sensor tells it to.

It also converts your fuel system to returnless.

And Carl at Vaporworx is a hellofa nice guy.

https://www.vaporworx.com/
+1 on the VaporWorx controller and Carl. I'm running a CTS-V pump module in my Rick's tank and you can barely hear it.
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post #23 of 23 (permalink) Old May 1st, 19, 9:37 AM
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gary
 
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Re: ECM Fuel Pump Control

Quote:
Originally Posted by 1967 chevelle malibu View Post
GM systems used the ECM to turn on the fuel pump relay. It turned on the relay for 2 sec. with key on. If cranking RPM is seen the ECM keeps the relay on. The oil press. Switch also supplies power to the fuel pump independent of the relay. So if the relay was defective it would stop the pump & turn off the engine.
My bad, the last sentence should read “so if the relay was defective the oil sw would provide power to the pump & keep the engine running.”
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