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Re: [GMCnet] Electric fuel pump and Carbs don't mix [message #80093]

Sun, 11 April 2010 02:07

Richard Brown

Messages: 281
Registered: May 2009

Karma: 1

Senior Member

We used to have an older(early 80's) Honda Civic wagon that had a module that only allowed the fuel pump to work while the engine was running. It hooked to the ignition and varied the fuel pump speed according to engine RPM, thereby keeping the pressure to the CVCC carb down. It would be just what the doctor ordered for us. The pump never ran at full speed that I know of, so there was plenty of flow to spare when needed. It used an electric pump with a diaphragm. I wore the car out(over 300k miles & never had a single problem with it. It blew a water hose & overheated, warping the head. An acquaintance of mine bought it & put a rebuilt motor in it & is driving it to this day with the same fuel pump and pump modulator it came with new.
Richard & Carol Brown
PO Box 941
Lindale, TX. 75771
1974 GMC Eleganza SE
wings77sporty@sbcglobal.net
(903)881-0192
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Richard & Carol Brown 1974 Eleganza SE 1174 Hickory Hills Dr. Murchison, TX. 75778

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Re: [GMCnet] Electric fuel pump and Carbs don't mix [message #80160 is a reply to message #80093]

Sun, 11 April 2010 13:18

jw mills

Messages: 199
Registered: September 2006

Karma: -30

Senior Member

I thought that the Oil Pressure switch was to stop the engine when oil
pressure went away - kinda like to minimize the damage from no
lubrication to the engine.
--
Jim Mills
Greeley, CO
1973 CanyonLands 260 TZE-063V100731(under renovation)
1973 Glacier 230 TZE-033V101993

On Sun, 2010-04-11 at 00:07 -0700, Richard Brown wrote:

> We used to have an older(early 80's) Honda Civic wagon that had a module that only allowed the fuel pump to work while the engine was running. It hooked to the ignition and varied the fuel pump speed according to engine RPM, thereby keeping the pressure to the CVCC carb down. It would be just what the doctor ordered for us. The pump never ran at full speed that I know of, so there was plenty of flow to spare when needed. It used an electric pump with a diaphragm. I wore the car out(over 300k miles & never had a single problem with it. It blew a water hose & overheated, warping the head. An acquaintance of mine bought it & put a rebuilt motor in it & is driving it to this day with the same fuel pump and pump modulator it came with new.
> Richard & Carol Brown
> PO Box 941
> Lindale, TX. 75771
> 1974 GMC Eleganza SE
> wings77sporty@sbcglobal.net
> (903)881-0192
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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Re: [GMCnet] Electric fuel pump and Carbs don't mix [message #80284 is a reply to message #80160]

Mon, 12 April 2010 09:22

Rick Denney

Messages: 430
Registered: January 2004

Karma: 0

Senior Member

jw mills wrote on Sun, 11 April 2010 14:18

I thought that the Oil Pressure switch was to stop the engine when oil
pressure went away - kinda like to minimize the damage from no
lubrication to the engine.

The main reason for the switch is safety. If you have a crash and the engine dies, but the key is still in the "on" position, you don't want the pump spraying gasoline all over hot things through whatever openings have appeared as a result of the crash.

Rick "who would simply wire around it temporarily if it failed" Denney

'73 Glacier 230 "Jaws"

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