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Fuel tank selector valve [message #346111]

Tue, 06 August 2019 16:11

MikeT

Messages: 225
Registered: November 2009
Location: Marine City, Michigan

Karma: 0

Senior Member

When I pulled the fuel hoses off the solenoid I forgot to note which hose was on top and which on bottom. Is the aux tank the bottom port or top port? Thanks

Mike Thomas Marine City, MI 77 ex Palm Beach

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Re: Fuel tank selector valve [message #346112 is a reply to message #346111]

Tue, 06 August 2019 17:35

mghamms

Messages: 466
Registered: March 2016
Location: Ware, Massachusetts

Karma: 2

Senior Member

I made the same mistake with mine.
Been running for 3 years and I still have no clue if it's right.
50-50 chance so it's probably wrong.

1977 Kingsley 455 as stock as it gets except lots of Ragusa parts

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Re: Fuel tank selector valve [message #346126 is a reply to message #346111]

Tue, 06 August 2019 20:23

JohnL455

Messages: 4447
Registered: October 2006
Location: Woodstock, IL

Karma: 12

Senior Member

The one you can blow through with no power applied is rear or main.

John Lebetski
Woodstock, IL
77 Eleganza II

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Re: Fuel tank selector valve [message #346144 is a reply to message #346111]

Wed, 07 August 2019 07:36

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

MikeT wrote on Tue, 06 August 2019 17:11

When I pulled the fuel hoses off the solenoid I forgot to note which hose was on top and which on bottom. Is the aux tank the bottom port or top port? Thanks

Mike,

Are you are asking about the OE part? (That should be replaced as it is not alcohol compatible.)
Or is this the aftermarket part that is upside down and backwards from the OE?

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: Fuel tank selector valve [message #346154 is a reply to message #346144]

Wed, 07 August 2019 09:08

MikeT

Messages: 225
Registered: November 2009
Location: Marine City, Michigan

Karma: 0

Senior Member

Hi Matt. I'm still trouble shooting the solenoid in the OE valve. Then I have to decide if I replace it with aftermarket valve and then maybe add one electric fuel pump on the aux hose prior to the valve.

Mike Thomas Marine City, MI 77 ex Palm Beach

[Updated on: Wed, 07 August 2019 11:48]

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Re: Fuel tank selector valve [message #346160 is a reply to message #346111]

Wed, 07 August 2019 11:15

GMC Cruse

Messages: 606
Registered: June 2009
Location: SE Michigan

Karma: 3

Senior Member

Fellow Spartan:

From the illustration in the Parts Book, the bottom hose goes to the front tank.

Go State!

Mike K. '75 PB Southeast Michigan

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Re: Fuel tank selector valve [message #346164 is a reply to message #346160]

Wed, 07 August 2019 11:47

MikeT

Messages: 225
Registered: November 2009
Location: Marine City, Michigan

Karma: 0

Senior Member

Thank you

Mike Thomas Marine City, MI 77 ex Palm Beach

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Re: [GMCnet] Fuel tank selector valve [message #346165 is a reply to message #346160]

Wed, 07 August 2019 11:52

emerystora

Messages: 4442
Registered: January 2004

Karma: 13

Senior Member

That was when it was new but they could have easily reversed over the years.

Go Blue

Emery Stora
77 Kingsley
Frederick CO

Emery

> On Aug 7, 2019, at 10:15 AM, Mike via Gmclist wrote:
>
> Fellow Spartan:
>
> From the illustration in the Parts Book, the bottom hose goes to the front tank.
>
> Go State!
> --
> Mike K.
> '75 PB
> Southeast Michigan
>
> _______________________________________________
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Re: [GMCnet] Fuel tank selector valve [message #346167 is a reply to message #346154]

Wed, 07 August 2019 12:57

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma: 9

Senior Member

Thomas,

After 21 years of GMCing, my unqualified recommendation is to eliminate the
selector valve completely. At least one electric pump is almost a
necessity with today's vapor lock prone fuels. Redundant pumps is even
better. So just eliminate the selector valve, put an electric pump on each
tank, and tee their outputs together. Use the tank selector switch to
select a pump. You'll need a couple of relays for that purpose (see the
link below for my wiring diagram -- which may not be the simplest
possible). The cost of the second pump should be little more than the cost
of the selector valve. You MAY need check valves on the output of the
pumps, dependent upon their designs. My 2 Carter 4070's do not require
them, but just in case I ever have to replace a pump on the road with one
that does need them, I included them anyway. That hasn't yet happened.

http://www.gmcmhphotos.com/photos/data/5494/Dual_Fuel_Pump_Wiring.pdf

By the way, a very capable GMCer just found that the cause of his baffling
engine failures was that the NEW valve he'd installed was sticking between
the two positions. :-(

Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, Troy-Bilt APU, etc., etc., etc.
www.gmcwipersetc.com

On Wed, Aug 7, 2019 at 10:12 AM Thomas Mike via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Hi Matt. I'm still trouble shooting the sonlioid in the OE valve. Then I
> have to decide if I replace it with aftermarket valve and ,then maybe add
> one
> electric fuel pump on the aux hose prior to the valve.
> --
> Mike Thomas
> Troy, MI
> 77 ex Palm Beach, 77 Royale (rear bath)
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
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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] Fuel tank selector valve [message #346233 is a reply to message #346167]

Thu, 08 August 2019 12:01

tmsnyder

Messages: 151
Registered: January 2014

Karma: -9

Senior Member

If you get it backwards, the gas gauge reading will be reversed too. You'll be reading the level in the tank you're not removing gas from.

Todd Snyder, Buffalo NY 1976 Eleganza II

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Re: [GMCnet] Fuel tank selector valve [message #346234 is a reply to message #346167]

Thu, 08 August 2019 12:08

tmsnyder

Messages: 151
Registered: January 2014

Karma: -9

Senior Member

An electric fuel pump installed without at least an inertial cutoff switch and preferably a low oil pressure cutoff switch seems like a recipe for disaster imho. I keep seeing this topic come up and it's never mentioned. Didn't we just loose a couple members when they were in an accident, hit a house and burned up in a fire?

An inertial cutoff switch ought to be required with any electric fuel pump installation, just my 2 cents.

Todd Snyder, Buffalo NY 1976 Eleganza II

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Re: [GMCnet] Fuel tank selector valve [message #346238 is a reply to message #346234]

Thu, 08 August 2019 12:58

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma: 9

Senior Member

Todd,

The wiring diagram for which I provided a link DOES include either a LOP
switch or supply from the alternator. But I agree with you that an
inertial shutoff is desirable -- I've got one laying on my workbench
awaiting installation. After I install it, I'll add it to the diagram.

Thanks for the reminder.

Ken H.

On Thu, Aug 8, 2019 at 1:34 PM Todd Snyder via Gmclist <
gmclist@list.gmcnet.org> wrote:

> An electric fuel pump installed without at least an inertial cutoff switch
> and preferably a low oil pressure cutoff switch seems like a recipe for
> disaster imho. I keep seeing this topic come up and it's never
> mentioned. Didn't we just loose a couple members when they were in an
> accident, hit a
> house and burned up in a fire?
>
> An inertial cutoff switch ought to be required with any electric fuel pump
> installation, just my 2 cents.
> --
> Todd Snyder, Buffalo NY
> 1976 Eleganza II
>
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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] Fuel tank selector valve [message #346243 is a reply to message #346234]

Thu, 08 August 2019 14:46

emerystora

Messages: 4442
Registered: January 2004

Karma: 13

Senior Member

Todd
I have not heard that the fire was caused by gasoline in the motorhome. It was mentioned that there was a propane bottle near the part of the mobile home that was struck but I have not heard as to what caused the fire.

What do you know about it? Have you seen anything more or are you assuming it was caused by an electric fuel pump in the motorhome that it didn’t have a cut off switch?

My motorhome doesn’t have an inertial cut off switch but it is cut off by my fuel injection computer. There are also other ways to do it.

Emery Stora
77 Kingsley
Frederick CO

> On Aug 8, 2019, at 11:08 AM, Todd Snyder via Gmclist wrote:
>
> An electric fuel pump installed without at least an inertial cutoff switch and preferably a low oil pressure cutoff switch seems like a recipe for
> disaster imho. I keep seeing this topic come up and it's never mentioned. Didn't we just loose a couple members when they were in an accident, hit a
> house and burned up in a fire?
>
> An inertial cutoff switch ought to be required with any electric fuel pump installation, just my 2 cents.
> --
> Todd Snyder, Buffalo NY
> 1976 Eleganza II
>
> _______________________________________________
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Re: Fuel tank selector valve [message #346275 is a reply to message #346111]

Fri, 09 August 2019 11:10

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

Garner a Ford switch from the Men's Mall, or off ebay or Amazon:

https://www.getoemparts.com/oem-parts/ford-inertia-switch-5l2z9341a?origin=pla&gclid=EAIaIQobChMI2MPUs5b24wIVj4bACh2ZAA2GEAYYBiABEgI-RPD_BwE

and others.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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Re: [GMCnet] Fuel tank selector valve [message #346288 is a reply to message #346167]

Fri, 09 August 2019 16:09

sbrenton

Messages: 6
Registered: June 2019

Karma: 0

Junior Member

Ken Henderson wrote on Wed, 07 August 2019 12:57

... put an electric pump on each
tank, and tee their outputs together. Use the tank selector switch to
select a pump...

Ken, do you still use the mechanical fuel pump?

Stephen Brenton - 1973 Painted Desert 23ft
Round O, South Carolina. The Lowcountry.

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Re: [GMCnet] Fuel tank selector valve [message #346310 is a reply to message #346288]

Sat, 10 August 2019 10:38

GMCWiperMan

Messages: 1248
Registered: December 2007

Karma: 1

Senior Member

No, and I discourage connecting an electric pump through a mechanical one.
Having only a thin moving membrane between gasoline and my engine oil
scares me.

Ken H.

On Fri, Aug 9, 2019, 17:12 stephen.brenton--- via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Ken Henderson wrote on Wed, 07 August 2019 12:57
>> ... put an electric pump on each
>> tank, and tee their outputs together. Use the tank selector switch to
>> select a pump...
>
>
> Ken, do you still use the mechanical fuel pump?
> --
> Stephen Brenton - 1973 Painted Desert 23ft
> Round O, South Carolina. The Lowcountry.
>
> _______________________________________________
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Re: Fuel tank selector valve [message #346317 is a reply to message #346111]

Sat, 10 August 2019 13:03

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

Isn't there one - iff Ford trucks maybe? which swaps both feed and return?

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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Re: Fuel tank selector valve [message #346318 is a reply to message #346111]

Sat, 10 August 2019 13:12

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

This would be the move, would it not?:

https://www.amazon.com/Selector-Valve-Diesels-Replaces-6C3Z-9189/dp/B07GT7LS19/ref=asc_df_B07GT7LS19/?tag=hyprod-20&linkCode=df0&hvadid=312484 993382&hvpos=1o4&hvnetw=g&hvrand=5594382446897765080&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocp hy=9011014&hvtargid=aud-801381245258:pla-569853388922&psc=1

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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