Home » Public Forums » GMCnet » [GMCnet] Your problem with lack of power
| [GMCnet] Your problem with lack of power [message #221622] |
Sun, 08 September 2013 10:31  |
Emery Stora
Messages: 959
Registered: January 2011
Karma: 4
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Ken,
Don't overlook your fuel selector valve. They sometimes stick partly open and pull fuel from both tanks. If that is happening and when you go up hills it can sometimes pull air through the hose from one tank and cause something that appears to be the same as vapor lock. It can also partially block the opening and cause a reduced flow with the result of the engine starving for fuel.
It can be checked by pulling the three hoses from the valve and blowing back from the exit port and seeing that it only comes through one inlet. It must be tested in both the Main and Aux positions of the dash switch (with the key on).
Emery Stora
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| Re: [GMCnet] Your problem with lack of power [message #221627 is a reply to message #221622] |
Sun, 08 September 2013 11:31  |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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| Emery Stora wrote on Sun, 08 September 2013 10:31 |
Ken,
Don't overlook your fuel selector valve. ...
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Ken told me when I was having my vapor lock problems that he has two P4070 inline pumps and no selector valve.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: [GMCnet] Your problem with lack of power [message #221630 is a reply to message #221627] |
Sun, 08 September 2013 11:58 |
jim kanomata
Messages: 257
Registered: March 2007
Location: fremont,ca
Karma: 12
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Senior Member |
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We replace the selector switch on all the coaches when we rehose the tanks as the rubber in it is the old type that cannot tolerate Ethenol.
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Your problem with lack of power [message #221640 is a reply to message #221622] |
Sun, 08 September 2013 13:55 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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General reply to all my helpers:
After a report of similar problems caused by a pickup coil I bit the bullet
and replaced the entire distributor. I've been reluctant to do that
because it's darned difficult the way my AC compressor is mounted.
Remember, the Cad's distributor is hidden up front, not right where you
need it, like the Olds'.
Also, since I don't have a timing light with me, I had to devise a timing
pointer to enable me to reset correctly. I've just idle tested it; the
engine started right up and accepts throttle, so that's it until we head
east again. While I don't remember the provenance of this distributor, I
couldn't get a new pickup right away and would have had to remove, dis- and
re-assemble and reinstall the distributor anyway. At least this way the
entire distributor is changed from when the problems occurred before.
As for the fuel system, there is no selector valve since I have a boost
pump on each tank. That's also why I've been so confident that the filters
were not to blame.
The only thing common to the engine and generator fuel systems is the main
tank. Not likely that's the problem.
If I can get the Honda tire repaired early enough tomorrow, I'll go ahead
and try Monarch Pass in the middle of the day -- verify the latest fix.
:-)
Ken H.
On Sep 8, 2013 9:31 AM, "Emery Stora" <emerystora@me.com> wrote:
> Ken,
> Don't overlook your fuel selector valve. They sometimes stick partly open
> and pull fuel from both tanks. If that is happening and when you go up
> hills it can sometimes pull air through the hose from one tank and cause
> something that appears to be the same as vapor lock. It can also partially
> block the opening and cause a reduced flow with the result of the engine
> starving for fuel.
>
> It can be checked by pulling the three hoses from the valve and blowing
> back from the exit port and seeing that it only comes through one inlet. It
> must be tested in both the Main and Aux positions of the dash switch (with
> the key on).
>
> Emery Stora
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Your problem with lack of power [message #221712 is a reply to message #221640] |
Sun, 08 September 2013 21:07 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ken,
While of no particular help I would like to note that YOU come up with some of the darnedest problems!
First it was thrust bearings that burn up for unknown reasons and now it's an engine that gets stroppy and won't run proper! ;-)
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
Sent: Sunday, September 08, 2013 1:56 PM
To: gmclist
Subject: Re: [GMCnet] Your problem with lack of power
General reply to all my helpers:
After a report of similar problems caused by a pickup coil I bit the bullet
and replaced the entire distributor. I've been reluctant to do that
because it's darned difficult the way my AC compressor is mounted.
Remember, the Cad's distributor is hidden up front, not right where you
need it, like the Olds'.
Also, since I don't have a timing light with me, I had to devise a timing
pointer to enable me to reset correctly. I've just idle tested it; the
engine started right up and accepts throttle, so that's it until we head
east again. While I don't remember the provenance of this distributor, I
couldn't get a new pickup right away and would have had to remove, dis- and
re-assemble and reinstall the distributor anyway. At least this way the
entire distributor is changed from when the problems occurred before.
As for the fuel system, there is no selector valve since I have a boost
pump on each tank. That's also why I've been so confident that the filters
were not to blame.
The only thing common to the engine and generator fuel systems is the main
tank. Not likely that's the problem.
If I can get the Honda tire repaired early enough tomorrow, I'll go ahead
and try Monarch Pass in the middle of the day -- verify the latest fix.
:-)
Ken H.
On Sep 8, 2013 9:31 AM, "Emery Stora" <emerystora@me.com> wrote:
> Ken,
> Don't overlook your fuel selector valve. They sometimes stick partly open
> and pull fuel from both tanks. If that is happening and when you go up
> hills it can sometimes pull air through the hose from one tank and cause
> something that appears to be the same as vapor lock. It can also partially
> block the opening and cause a reduced flow with the result of the engine
> starving for fuel.
>
> It can be checked by pulling the three hoses from the valve and blowing
> back from the exit port and seeing that it only comes through one inlet. It
> must be tested in both the Main and Aux positions of the dash switch (with
> the key on).
>
> Emery Stora
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
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Unsubscribe or Change List Options:
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Your problem with lack of power [message #221727 is a reply to message #221712] |
Sun, 08 September 2013 22:59 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Takes real skill, that. :-(
Skillful Ken
On Sep 8, 2013 8:07 PM, "Rob Mueller" <robmueller@iinet.net.au> wrote:
> Ken,
>
> While of no particular help I would like to note that YOU come up with
> some of the darnedest problems!
>
> First it was thrust bearings that burn up for unknown reasons and now it's
> an engine that gets stroppy and won't run proper! ;-)
>
> Regards,
> Rob M.
>
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org [mailto:
> gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
> Sent: Sunday, September 08, 2013 1:56 PM
> To: gmclist
> Subject: Re: [GMCnet] Your problem with lack of power
>
> General reply to all my helpers:
>
> After a report of similar problems caused by a pickup coil I bit the bullet
> and replaced the entire distributor. I've been reluctant to do that
> because it's darned difficult the way my AC compressor is mounted.
> Remember, the Cad's distributor is hidden up front, not right where you
> need it, like the Olds'.
>
> Also, since I don't have a timing light with me, I had to devise a timing
> pointer to enable me to reset correctly. I've just idle tested it; the
> engine started right up and accepts throttle, so that's it until we head
> east again. While I don't remember the provenance of this distributor, I
> couldn't get a new pickup right away and would have had to remove, dis- and
> re-assemble and reinstall the distributor anyway. At least this way the
> entire distributor is changed from when the problems occurred before.
>
> As for the fuel system, there is no selector valve since I have a boost
> pump on each tank. That's also why I've been so confident that the filters
> were not to blame.
>
> The only thing common to the engine and generator fuel systems is the main
> tank. Not likely that's the problem.
>
> If I can get the Honda tire repaired early enough tomorrow, I'll go ahead
> and try Monarch Pass in the middle of the day -- verify the latest fix.
> :-)
>
> Ken H.
>
> On Sep 8, 2013 9:31 AM, "Emery Stora" <emerystora@me.com> wrote:
>
> > Ken,
> > Don't overlook your fuel selector valve. They sometimes stick partly open
> > and pull fuel from both tanks. If that is happening and when you go up
> > hills it can sometimes pull air through the hose from one tank and cause
> > something that appears to be the same as vapor lock. It can also
> partially
> > block the opening and cause a reduced flow with the result of the engine
> > starving for fuel.
> >
> > It can be checked by pulling the three hoses from the valve and blowing
> > back from the exit port and seeing that it only comes through one inlet.
> It
> > must be tested in both the Main and Aux positions of the dash switch
> (with
> > the key on).
> >
> > Emery Stora
> > _______________________________________________
> > 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
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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