Home » Public Forums » GMCnet » Electric fuel pump question
| Electric fuel pump question [message #116743] |
Sun, 27 February 2011 07:46  |
lance
Messages: 190
Registered: December 2004
Location: Vancouver, WA
Karma: 0
|
Senior Member |
|
|
Today I plan to install an electric fuel pump and am seeking the group's sage advice. Seriously, you guys are the best. So, do I remove or bypass the manual pump or install the electric pump ahead of the manual pump? Any other suggestions?
1974 Palm Beach
|
|
|
|
|
|
| Re: Electric fuel pump question [message #116745 is a reply to message #116743] |
Sun, 27 February 2011 08:36  |
shawnee
Messages: 422
Registered: February 2004
Location: NC
Karma: 0
|
Senior Member |
|
|
| lance wrote on Sun, 27 February 2011 08:46 |
Today I plan to install an electric fuel pump and am seeking the group's sage advice. Seriously, you guys are the best. So, do I remove or bypass the manual pump or install the electric pump ahead of the manual pump? Any other suggestions?
|
Lance,
I have used an electric fuel pump for several years. I removed the mechanical fuel pump and blocked the port. I carry a spare but have never had to use it. I have a filter before the pump and I installed a metal gas line around the drivers side of the engine and down to the frame. I put a rubber tube around the metal gas line for insulation and have never had any kind of fuel starvation. I have a bypass switch on the dash to prime the carb when it has set for a while. It is imperative to install an oil pressure switch to cut off the pump on loss of oil pressure.
A spare is probably not needed due to the reliability of a good electric pump and availability at most auto parts stores.
Gene Dotson
74 Canyonlands
www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
|
|
|
|
| Re: Electric fuel pump question [message #116746 is a reply to message #116745] |
Sun, 27 February 2011 08:49 |
lance
Messages: 190
Registered: December 2004
Location: Vancouver, WA
Karma: 0
|
Senior Member |
|
|
Thanks for your advice but tell me more about the oil pressure switch. Do I install a new one or utilize the existing switch? Where do I install a new one. I seem to remember a blocked off 1/4" pipe thread hole somewhere.
1974 Palm Beach
|
|
|
|
| Re: [GMCnet] Electric fuel pump question [message #116747 is a reply to message #116745] |
Sun, 27 February 2011 08:51 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
|
Senior Member |
|
|
yes
and as Emery and others say, mount the pump outside the frame
'and
use a oil pressure switch to power it
http://gmcmotorhome.info/engine.html#pump
gene
On Sun, Feb 27, 2011 at 6:36 AM, Gene Dotson <shawnee@charter.net> wrote:
>
>
> lance wrote on Sun, 27 February 2011 08:46
> > Today I plan to install an electric fuel pump and am seeking the group's
> sage advice. Seriously, you guys are the best. So, do I remove or bypass the
> manual pump or install the electric pump ahead of the manual pump? Any
> other suggestions?
>
>
>
> Lance,
>
> I have used an electric fuel pump for several years. I removed the
> mechanical fuel pump and blocked the port. I carry a spare but have never
> had to use it. I have a filter before the pump and I installed a metal gas
> line around the drivers side of the engine and down to the frame. I put a
> rubber tube around the metal gas line for insulation and have never had any
> kind of fuel starvation. I have a bypass switch on the dash to prime the
> carb when it has set for a while. It is imperative to install an oil
> pressure switch to cut off the pump on loss of oil pressure.
>
> A spare is probably not needed due to the reliability of a good electric
> pump and availability at most auto parts stores.
> --
> Gene Dotson
> 74 Canyonlands
> www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
|
|
|
|
| Re: [GMCnet] Electric fuel pump question [message #116755 is a reply to message #116750] |
Sun, 27 February 2011 10:07 |
idrob
Messages: 645
Registered: January 2005
Location: Central Idaho
Karma: 0
|
Senior Member |
|
|
| lance wrote on Sun, 27 February 2011 07:06 |
Thanks to all but am still unsure where to mount this pressure safety switch?
|
The alternative to the low oil pressure switch/relay system is to feed the new pump from the center stud of the isolator. That way, if the alternator stops (indicating that the engine has stopped) the pump cannot run. To start the pump system, you do need a momentary contact by pass switch connected to another power source which is available when the key is on.
Rob Allen
former owner of '76 x-PB
|
|
|
|
| Re: [GMCnet] Electric fuel pump question [message #116758 is a reply to message #116755] |
Sun, 27 February 2011 10:19 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
|
Senior Member |
|
|
Just be sure to remember that if you have, or later install, a combiner, the
pump will be powered ALWAYS.
Ken H.
On Sun, Feb 27, 2011 at 11:07 AM, Rob Allen <profmail@wildblue.net> wrote:
>
>
> lance wrote on Sun, 27 February 2011 07:06
> > Thanks to all but am still unsure where to mount this pressure safety
> switch?
>
>
> The alternative to the low oil pressure switch/relay system is to feed the
> new pump from the center stud of the isolator. That way, if the alternator
> stops (indicating that the engine has stopped) the pump cannot run. To
> start the pump system, you do need a momentary contact by pass switch
> connected to another power source which is available when the key is on.
>
> --
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
|
|
|
|
| Re: [GMCnet] Electric fuel pump question [message #116762 is a reply to message #116758] |
Sun, 27 February 2011 10:57 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
|
Senior Member |
|
|
unless you install the combiner this way
http://goo.gl/FG9T3
and then the isolator still provides isolation, and the pump only is powered
by the alternator
gene
Just be sure to remember that if you have, or later install, a combiner, the
> pump will be powered ALWAYS.
>
> Ken H.
>
>
>
> On Sun, Feb 27, 2011 at 11:07 AM, Rob Allen <profmail@wildblue.net> wrote:
>
> >
> >
> > lance wrote on Sun, 27 February 2011 07:06
> > > Thanks to all but am still unsure where to mount this pressure safety
> > switch?
> >
> >
> > The alternative to the low oil pressure switch/relay system is to feed
> the
> > new pump from the center stud of the isolator. That way, if the
> alternator
> > stops (indicating that the engine has stopped) the pump cannot run. To
> > start the pump system, you do need a momentary contact by pass switch
> > connected to another power source which is available when the key is on.
> >
> > --
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
|
|
| Re: [GMCnet] Electric fuel pump question [message #116822 is a reply to message #116817] |
Sun, 27 February 2011 17:47 |
|
|
Based on my REAL WORLD experience, the voltage from the alternator will
drop SIGNIFICANTY faster than the oil pressure will.
On 2/27/2011 3:52 PM, mills wrote:
> I think a Low Oil Pressure switch would be better. I would rather the
> fuel pump stop when the oil pressure drops than when the alternator
> voltage drops to where the fuel pump won't run any more.
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Terry Taylor
'74 ex-Eleganza SE
San Lorenzo, CA
http://www.n6mon.org
http://dldesignstore.com
|
|
|
|
|
|
|
|
| Re: [GMCnet] Electric fuel pump question [message #116830 is a reply to message #116823] |
Sun, 27 February 2011 18:23 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
| emerystora wrote on Sun, 27 February 2011 17:50 |
On Feb 27, 2011, at 4:52 PM, mills wrote:
> I think a Low Oil Pressure switch would be better. I would rather the
> fuel pump stop when the oil pressure drops than when the alternator
> voltage drops to where the fuel pump won't run any more.
> --
> Jim Mills
>
I agree. I have twice (over 30 years of driving the GMC) had my alternator go bad. I was able to continue to where I could get it fixed or buy another by running my Onan to keep my battery up and headlights lit. I once drove 250 miles this way. If I had had an electric fuel pump powered from the center of the battery isolator that would not get voltage with a bad alternator or from the Onan and my engine would not run unless I did some rewiring.
Emery Stora
77 Kingsley
Santa Fe, NM
|
My $1.00 combiner will fix that problem. (2 alligator clips and a 6" piece of wire). I keep it tied around the wires going to the isolator. I have never needed it but it is there just in case.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: [GMCnet] Electric fuel pump question [message #116831 is a reply to message #116828] |
Sun, 27 February 2011 18:25 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
|
Senior Member |
|
|
Diodes fail shorted. --on-- which burned up one gmc
Isolators fail open
Just use the oil pressure switch
Gene
Sent from McDonalds
On Feb 27, 2011, at 4:18 PM, mills <mills@bmi.net> wrote:
> That is good to know. In that case I would use a diode from the center
> post to the fuel pump wire and go that way.
> I work on large, slow diesels (11,756 cid @950 rpm) on which the oil
> pressure is first to go.
> --
> Jim Mills
> Greeley, CO
> 1973 CanyonLands 260 TZE-063V100731(under renovation)
> 1973 Glacier 230 TZE-033V101993
> KD0NPU
>
> On Sun, 2011-02-27 at 15:47 -0800, Terry Taylor wrote:
>
>> Based on my REAL WORLD experience, the voltage from the alternator will
>> drop SIGNIFICANTY faster than the oil pressure will.
>>
>> On 2/27/2011 3:52 PM, mills wrote:
>>> I think a Low Oil Pressure switch would be better. I would rather the
>>> fuel pump stop when the oil pressure drops than when the alternator
>>> voltage drops to where the fuel pump won't run any more.
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: Electric fuel pump question [message #116836 is a reply to message #116743] |
Sun, 27 February 2011 18:48 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
| lance wrote on Sun, 27 February 2011 07:46 |
Today I plan to install an electric fuel pump and am seeking the group's sage advice. Seriously, you guys are the best. So, do I remove or bypass the manual pump or install the electric pump ahead of the manual pump? Any other suggestions?
|
You will get lost of suggestions and 5 different way to mount and wire up an electric fuel pump. I think be fore you adopt any of them you need to answer several questions for yourself.
The first one is:
Why are you installing an electric fuel pump?
If it is to act as a boost pump for vapor lock problems in the summer and not run all the time then wiring, mounting, and plumbing should be done one way.
If it is to replace the existing pump mechanical pump then plumbing and wiring probably should be differently.
The next question is:
Do you want a prime push button switch on the dash to fill the carb up before starting?
This is usually only necessary if you have not installed crossover blocking plates, or an aluminum manifold, to prevent boiling gas out of the carb on shut down. It is also useful if the coach sits for many month between start ups.
question 3:
Do you want multiple fuel pumps for redundancy?
Answer those three questions and we can find a couple of good / safe solutions for you.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: [GMCnet] Electric fuel pump question [message #116838 is a reply to message #116831] |
Sun, 27 February 2011 18:51 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
| Mr ERFisher wrote on Sun, 27 February 2011 18:25 |
Diodes fail shorted. --on-- which burned up one gmc
Isolators fail open
Just use the oil pressure switch
Gene
Sent from McDonalds
|
???????????? An isolator is two diodes.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: Electric fuel pump question [message #116851 is a reply to message #116746] |
Sun, 27 February 2011 19:43 |
shawnee
Messages: 422
Registered: February 2004
Location: NC
Karma: 0
|
Senior Member |
|
|
| lance wrote on Sun, 27 February 2011 09:49 |
Thanks for your advice but tell me more about the oil pressure switch. Do I install a new one or utilize the existing switch? Where do I install a new one. I seem to remember a blocked off 1/4" pipe thread hole somewhere.
|
Lance,
I used the same oil pressure port by putting in a "T" then put the original sender in one port and a Chevy Vega three pin oil sender in the other one. I also put in a relay that energizes the fuel pump from battery voltage.
Gene Dotson
74 Canyonlands
www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
|
|
|
|
| Re: [GMCnet] Electric fuel pump question [message #116852 is a reply to message #116831] |
Sun, 27 February 2011 19:45 |
jw mills
Messages: 199
Registered: September 2006
Karma: -30
|
Senior Member |
|
|
good point but if the alternator fails and you have an alternate feed
for the fuel pump would the back feed to teh alternator cause more
problems?
--
Jim Mills
Greeley, CO
1973 CanyonLands 260 TZE-063V100731(under renovation)
1973 Glacier 230 TZE-033V101993
KD0NPU
On Sun, 2011-02-27 at 16:30 -0800, mr.erfisher@gmail.com wrote:
> Diodes fail shorted. --on-- which burned up one gmc
>
> Isolators fail open
>
> Just use the oil pressure switch
>
> Gene
>
> Sent from McDonalds
>
>
>
>
>
>
> On Feb 27, 2011, at 4:18 PM, mills <mills@bmi.net> wrote:
>
> > That is good to know. In that case I would use a diode from the center
> > post to the fuel pump wire and go that way.
> > I work on large, slow diesels (11,756 cid @950 rpm) on which the oil
> > pressure is first to go.
> > --
> > Jim Mills
> > Greeley, CO
> > 1973 CanyonLands 260 TZE-063V100731(under renovation)
> > 1973 Glacier 230 TZE-033V101993
> > KD0NPU
> >
> > On Sun, 2011-02-27 at 15:47 -0800, Terry Taylor wrote:
> >
> >> Based on my REAL WORLD experience, the voltage from the alternator will
> >> drop SIGNIFICANTY faster than the oil pressure will.
> >>
> >> On 2/27/2011 3:52 PM, mills wrote:
> >>> I think a Low Oil Pressure switch would be better. I would rather the
> >>> fuel pump stop when the oil pressure drops than when the alternator
> >>> voltage drops to where the fuel pump won't run any more.
> >>
> >> _______________________________________________
> >> GMCnet mailing list
> >> Unsubscribe or Change List Options:
> >> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
Goto Forum:
Current Time: Mon Sep 30 14:30:18 CDT 2024
Total time taken to generate the page: 0.01074 seconds
|
GMCforum
Search
Help
Register
Login
Home
