| [GMCnet] Fuel Tank Selector [message #322163] |
Tue, 15 August 2017 17:02  |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
|
Senior Member |
|
|
Quick question: Do I understand the schematics correct, that the fuel
selector switch only applies power to the fuel tank transfer valve, if
FUEL AUX is selected?
--
Best regards
Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA
'76a Eleganza II, CA
'73 Sequoia, NH
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
|
|
|
|
|
|
|
|
| Re: [GMCnet] Fuel Tank Selector [message #322167 is a reply to message #322163] |
Tue, 15 August 2017 18:02  |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Peer,
I ran into a problem on Double Trouble, sometime before I purchased the coach the Main/Aux switch had been installed upside down,
when the switch was in MAIN it was actually in AUX and power was being applied to the selector valve.
The afternoon Helen and I were leaving Houston on a trip we were at John Sharpe's home about to pull out with the engine running
when the OEM gages died! No fuel level, no oil pressure, etc. we did some quick trouble shooting and found a blown fuse so I
replaced it but it blew again. We needed to leave and didn't have time to dig into this so I went to an auto parts store and bought
a mechanical oil pressure gage and "tee'd" it in. I felt that was the only gage I REALLY needed.
When I had time I did some trouble shooting, found that the selector valve solenoid had failed which caused the fuse to blow. After
replacing the selector valve I discovered when testing it that the solenoid actuated when in the MAIN position and turned off when
in the AUX position. That indicated that the switch was installed up side down. I thought I could just flip the connector over but
that wouldn't work as it only went on one way. To fix the problem the switch had to be removed from the panel and turned over and
that's a big job! I wound up making a couple of Dymo labels - AUX & MAIN and sticking them on the dash to indicate the selector
valve position.
I reckon the reason the selector valve failed is it was on constantly for God only knows how long!
The wiring is weird, I don't understand why the selector valve gets it's power from the instrument circuit.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Peer Oliver Schmidt GMC
Sent: Wednesday, August 16, 2017 8:02 AM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Fuel Tank Selector
Quick question: Do I understand the schematics correct, that the fuel
selector switch only applies power to the fuel tank transfer valve, if
FUEL AUX is selected?
--
Best regards
Peer Oliver Schmidt
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
| Re: [GMCnet] Fuel Tank Selector [message #322169 is a reply to message #322167] |
Tue, 15 August 2017 18:26 |
 |
Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
|
Senior Member |
|
|
USAussie wrote on Tue, 15 August 2017 19:02Peer,
I ran into a problem on Double Trouble, sometime before I purchased the coach the Main/Aux switch had been installed upside down,
when the switch was in MAIN it was actually in AUX and power was being applied to the selector valve.
<snip>
I reckon the reason the selector valve failed is it was on constantly for God only knows how long!
The wiring is weird, I don't understand why the selector valve gets it's power from the instrument circuit.
Regards,
Rob M.
Rob,
We have always run ours a substantial portion of the time we are underway, but the coil didn't fail, the fool thing just no longer selected a tank. I almost got caught on that one. They would have to have been made for continues duty service.
The selector valve gets its power from the instrument circuit because that is what is already close to the switch. Otherwise they would have had to run another feed all the way to the switch.
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
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
