| [GMCnet] Stranded - engine surging / stalling issues [message #281106] |
Tue, 30 June 2015 16:47  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
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Senior Member |
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All good points, Jon. One additional suggestion is to check the fuse that services that fuel selector switch. It needs to be at least 20 amps to carry the load of the fuel pump in addition to the fuel selector switch. Make sure to remove the existing fuse, clean the clips and the fuse ends and reinstall it with some kind of anti ox. The PO may have replaced that fuse with a lower amp unit and you do not want to have the fuse blow just when you need the electric fuel pump!
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
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Message: 1
Date: Tue, 30 Jun 2015 08:50:19 -0600
From: Jon Roche
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Stranded - engine surging / stalling issues
Message-ID:
Content-Type: text/plain; charset="utf-8"
I am sure you can overly complicate the dipping mechanism.
I personally just do not feel that there is a real big concern about filling the crankcase with fuel from the fuel pump. I know it has happened, and
I am sure it can happen, and the costs of a new engine are huge. But I believe the chance of that is really rare. There are far more mechanical
fuel pumps out there running, then people bypassing them and using electric fuel pumps.
Electric fuel pumps are a great thing, but again, if you want to keep things simple and inexpensive, the mechanical fuel pump is the way to go.
The JimB method of adding an aux fuel pump, has proven to be pretty successful. and what makes it really nice, is it is extremely inexpensive, and
very easy to install and operate. Will it solve all problems? I do not know, nor claim to know. I just know it has worked well for me.
buy an electric fuel pump with out a check valve such as:
http://www.amazon.com/Autobest-12S-Universal-Electronic-Fuel/dp/B00C59RSXG/ref=sr_1_6?ie=UTF8&qid=1435675065&sr=8-6&keywords=electric++fue l+pump
replace the fuel selector switch while you are under the coach:
http://www.amazon.com/Standard-Motor-Products-FV1T-Selector/dp/B005ETOVZM/ref=sr_1_1?ie=UTF8&qid=1435675462&sr=8-1&keywords=standard+fuel+ selector
plumb the fuel line coming from the aux tank to the fuel pump. then from the fuel pump to the aux in on the selector switch. the main tank fuel
line direct to the selector switch.
Jumper the wire that feeds the fuel selector switch, to power the fuel pump. ground the fuel pump to the frame. It can all be easily mounted to the
floor, just forward of the fuel tanks. easy to move the original fuel selector over for easy access.
so for about $60.00 and an hour of your time, mostly spent jacking up the coach to get under it. you are done.
switch the aux on the dash before starting the engine and listen for the pump to hear it running. It will prime your carb, and will start with less
cranking. then after starting, switch back to main tank. If you feel some hesitation that might be vapor lock, then switch dash over to aux to
push some fuel up, to overcome the vapor lock. My experience on flat land, and 90 temps, that is all it took. I have not had to travel at altitude,
or at temps closer to 100.
--
Jon Roche
75 palm beach
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] Stranded - engine surging / stalling issues [message #281156 is a reply to message #281106] |
Wed, 01 July 2015 01:34  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Holy Cow. What kind of pump are you using that draws that kind of current. My Carter P4070 draws 1.5 amps and I have a 3 amp fuse in line with it. I believe that wire to the fuel selector is 18 ga. or maybe 16 ga. I would be very worried about burning it with a 20 amp fuse protecting it. I would also go to a different pump that uses less power. 250 watts is a lot of power at 12-14 VDC.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Stranded - engine surging / stalling issues [message #282180 is a reply to message #282174] |
Wed, 15 July 2015 12:31 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Ed,
Yes, that small filter is applied different than most as the fuel flow from
inside to out.
We constantly have people tell us that the filter is clean, till we tell
them to cut it open and look at the inside.
On Wed, Jul 15, 2015 at 10:17 AM, Edward Jarmul
wrote:
> When checking the carb fuel filter be sure to cut it in half since the flow
> is from inside out. I didn't see any debris until the mechanic showed me
> what was on the inside. Although in my case, without an electric pump, the
> problem worsened the more I drove until I couldn't drive it anymore (more
> clogging). Ran fine for a short while after stopping.
>
> EdJ
> 76 Coca Cola 403 in Elsa TX
> 73 Glacier 455 in Perham, ME
> _______________________________________________
> GMCnet mailing list
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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