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recent trip, questions and comments requested. [message #255353] Mon, 14 July 2014 16:55 Go to next message
chasingsummer is currently offline  chasingsummer   United States
Messages: 434
Registered: May 2011
Location: asheboro, nc
Karma: 0
Senior Member
Where do I start.
200 miles drive to get there was un eventful. next day I bought smallest fuel pump the auto zone had hoping to get genny to run. Installed but did not get a chance to test. Fellow camper offered for me to plug into his portabe to keep batteries up. Since I had to listen to it run anyway , I took him up on it. I plug in and go bike riding. 6 hours later I return. I either left water running (doubtful)or some one turned it on for me. eitherway pump was on, faucet was open, and all water now is in my waste tank.
2 days later I go to return home. Approx 35 country miles later my engine acts as if starving for gas or fire. I replace ignition module since I had one and it is simple. off again. Approx 35 miles later the runnign issue returns. This time I do the proper thing of watching for gas in carb as I try to start. No gas. I ended up removing the pump from genny, and connect it between manual pump and carb. wires run straight to battery. Off we go again.
Approx 100 miles later I blow a tire, rear drivers side. of course this not oonly snapped the air line to air bag, but filled airbag with splinters. I barely get off road. As I set out to replace tire, i find myself with what I thought was plenty of jacks, blocks and etc, but none able to help. when air bag went, well you know how low that but me to ground. (thank goodnes for road side coverage with insurance). And with having a 4 x 4 long enought to fit and get me home.
Questions are, where is best place to mount electric fuel pump, and can I wire off of dizzy or ? so that it only runs with ignition?
What size (flow rate is recommended. Do I just disconnect manual pump , or should I remove it, and if I remove, dont I need to block off hole it came from? And, I have seen pics of someone using a big spring. I understand he later went back to air bag for adjustment reasons. Has anyone done a spring, with an air shock inside it so that air shock gives some height adjustment? Is there a practical way to cover air bag so that it is protected from blow out? Is there such a valve , that if air line gets busted at bag, that bag will stay up?
Last question, and sorry to be so long winded. If I pull fuel line from genny pump, shouldnt it gravity feed fuel into a can as a way of verifing having fuel?
And of course, any other input is appreciated, trip was not a total bust, but drive home was a very long day.
thanks to all
bgk


brian asheboro, nc 75 eleganza, 74 build 119k miles and counting, DOG HOUSE
Re: recent trip, questions and comments requested. [message #255363 is a reply to message #255353] Mon, 14 July 2014 18:04 Go to previous messageGo to next message
Ken Burton is currently offline  Ken Burton   United States
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
Senior Member
chasingsummer wrote on Mon, 14 July 2014 16:55
Where do I start.
200 miles drive to get there was un eventful. next day I bought smallest fuel pump the auto zone had hoping to get genny to run. Installed but did not get a chance to test. Fellow camper offered for me to plug into his portabe to keep batteries up. Since I had to listen to it run anyway , I took him up on it. I plug in and go bike riding. 6 hours later I return. I either left water running (doubtful)or some one turned it on for me. eitherway pump was on, faucet was open, and all water now is in my waste tank.
2 days later I go to return home. Approx 35 country miles later my engine acts as if starving for gas or fire. I replace ignition module since I had one and it is simple. off again. Approx 35 miles later the runnign issue returns. This time I do the proper thing of watching for gas in carb as I try to start. No gas. I ended up removing the pump from genny, and connect it between manual pump and carb. wires run straight to battery. Off we go again.
Approx 100 miles later I blow a tire, rear drivers side. of course this not oonly snapped the air line to air bag, but filled airbag with splinters. I barely get off road. As I set out to replace tire, i find myself with what I thought was plenty of jacks, blocks and etc, but none able to help. when air bag went, well you know how low that but me to ground. (thank goodnes for road side coverage with insurance). And with having a 4 x 4 long enought to fit and get me home.
Questions are, where is best place to mount electric fuel pump, and can I wire off of dizzy or ? so that it only runs with ignition?
What size (flow rate is recommended. Do I just disconnect manual pump , or should I remove it, and if I remove, dont I need to block off hole it came from? And, I have seen pics of someone using a big spring. I understand he later went back to air bag for adjustment reasons. Has anyone done a spring, with an air shock inside it so that air shock gives some height adjustment? Is there a practical way to cover air bag so that it is protected from blow out? Is there such a valve , that if air line gets busted at bag, that bag will stay up?
Last question, and sorry to be so long winded. If I pull fuel line from genny pump, shouldnt it gravity feed fuel into a can as a way of verifing having fuel?
And of course, any other input is appreciated, trip was not a total bust, but drive home was a very long day.
thanks to all
bgk


A lot of questions there but all of them are common to the GMC. Let's see if I can answer a one of them.

Let's start with the hardest one. You want to install an electric fuel pump. The first thing to answer is why? Is it only for intermittent use in times of probable vapor lock? Or are you trying to replace the mechanical pump completely and use the electric pump(s) 100% time?

After you answer those questions we can decide on the best approach.

On any electric pump installation the closer you can get the pump to the fuel source (the tank) the better your installation will be.

After you answer the above questions some of the solution we can look at are:

2 individual in tank pumps
2 external Carter P4070 pumps near the tank
1 external Carter P4070 mounted just after the tanks selector valve
1 external cheap pump mounted only to the auxiliary tank and powered by the aux tank selector valve.

Once you decide on what you want to accomplish we can discuss how to safely wire it up.

Note: I had an engine fire a few years back fed by an electric pump that did not shut down. You want to get it wired correctly.


Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
Re: [GMCnet] recent trip, questions and comments requested. [message #255365 is a reply to message #255363] Mon, 14 July 2014 18:17 Go to previous message
Mr ERFisher is currently offline  Mr ERFisher   United States
Messages: 7117
Registered: August 2005
Karma: 2
Senior Member
here is the best way to power the electric pump
http://gmcmotorhome.info/engine.html#pump

erf


On Mon, Jul 14, 2014 at 4:04 PM, Ken Burton wrote:

> chasingsummer wrote on Mon, 14 July 2014 16:55
>> Where do I start.
>> 200 miles drive to get there was un eventful. next day I bought smallest
> fuel pump the auto zone had hoping to get genny to run. Installed but did
>> not get a chance to test. Fellow camper offered for me to plug into his
> portabe to keep batteries up. Since I had to listen to it run anyway , I
>> took him up on it. I plug in and go bike riding. 6 hours later I return.
> I either left water running (doubtful)or some one turned it on for me.
>> eitherway pump was on, faucet was open, and all water now is in my waste
> tank.
>> 2 days later I go to return home. Approx 35 country miles later my
> engine acts as if starving for gas or fire. I replace ignition module since
> I
>> had one and it is simple. off again. Approx 35 miles later the runnign
> issue returns. This time I do the proper thing of watching for gas in carb
> as
>> I try to start. No gas. I ended up removing the pump from genny, and
> connect it between manual pump and carb. wires run straight to battery. Off
> we
>> go again.
>> Approx 100 miles later I blow a tire, rear drivers side. of course this
> not oonly snapped the air line to air bag, but filled airbag with
>> splinters. I barely get off road. As I set out to replace tire, i find
> myself with what I thought was plenty of jacks, blocks and etc, but none
> able
>> to help. when air bag went, well you know how low that but me to ground.
> (thank goodnes for road side coverage with insurance). And with having a 4
>> x 4 long enought to fit and get me home.
>> Questions are, where is best place to mount electric fuel pump, and can
> I wire off of dizzy or ? so that it only runs with ignition?
>> What size (flow rate is recommended. Do I just disconnect manual pump ,
> or should I remove it, and if I remove, dont I need to block off hole it
>> came from? And, I have seen pics of someone using a big spring. I
> understand he later went back to air bag for adjustment reasons. Has anyone
> done
>> a spring, with an air shock inside it so that air shock gives some
> height adjustment? Is there a practical way to cover air bag so that it is
>> protected from blow out? Is there such a valve , that if air line gets
> busted at bag, that bag will stay up?
>> Last question, and sorry to be so long winded. If I pull fuel line from
> genny pump, shouldnt it gravity feed fuel into a can as a way of verifing
>> having fuel?
>> And of course, any other input is appreciated, trip was not a total
> bust, but drive home was a very long day.
>> thanks to all
>> bgk
>
>
> A lot of questions there but all of them are common to the GMC. Let's see
> if I can answer a one of them.
>
> Let's start with the hardest one. You want to install an electric fuel
> pump. The first thing to answer is why? Is it only for intermittent use in
> times of probable vapor lock? Or are you trying to replace the mechanical
> pump completely and use the electric pump(s) 100% time?
>
> After you answer those questions we can decide on the best approach.
>
> On any electric pump installation the closer you can get the pump to the
> fuel source (the tank) the better your installation will be.
>
> After you answer the above questions some of the solution we can look at
> are:
>
> 2 individual in tank pumps
> 2 external Carter P4070 pumps near the tank
> 1 external Carter P4070 mounted just after the tanks selector valve
> 1 external cheap pump mounted only to the auxiliary tank and powered by
> the aux tank selector valve.
>
> Once you decide on what you want to accomplish we can discuss how to
> safely wire it up.
>
> Note: I had an engine fire a few years back fed by an electric pump that
> did not shut down. You want to get it wired correctly.
>
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> 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
-------
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Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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