Home » Public Forums » GMCnet » FUEL TANK R&R
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| Re: [GMCnet] FUEL TANK R&R [message #196817 is a reply to message #196815] |
Wed, 30 January 2013 00:53   |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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| Mr ERFisher wrote on Tue, 29 January 2013 20:44 |
- did you put back hard lines?
- did you cut a hole over the sender?
- did you rehab the liquid separator?
- did you solder the sender?
gene
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My tanks are down now. My all new hoses as of two years ago were burping gas when a fast pump clicked off when full.
We had to replace the sender in '09. The new sender's tubes were a bit longer. This allowed the end of the tube and hose to rub on the edge of the relief hole in the floor. This was the original hole. The rear tank fill vent hose had worn a hole where the interference took place.
If you are replacing a sender, check out clearances carefully. Randy and Margie Van Winkle are here and Randy relieved the original hole edge with a spade drill, tapering the edge for about four inches. Tomorrow we will see how the new "canyon" works as the tank goes up. (man the cement in the barn is coooold.)
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] FUEL TANK R&R [message #196818 is a reply to message #196817] |
Wed, 30 January 2013 04:39 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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remember
- all lines (and the senders), can be fixed from a hole in the floor, from
the top except the vapor-vent lines
- the , floor hole, must be added after the tanks are up - existing relief
holes are wrong
- vapor lines need to be replaced with a compression connector and hard line
http://www.gmcmhphotos.com/photos/data/4634/TANK_VENTS1.pdf
- the sender, suction, and fill vent lines can be fixed from a top hole in
the floor
- every sender, (old, and new), should be soldered
http://www.gmcmhphotos.com/photos/23-gas-tank-sender-repair/p37204-how-to-repair-a-gas-tank-sender.html
- short rubber couplers or compression fittings can be used on the sender
- use pre-made brake lines so no flares are required to be made
- soak drain plugs, and Onan connection, with Kroil, remove and re-seat
them with *Anti*-*Seize*
- unless you use hard lines, and a hole in the floor --- you will do this
again
good luck
JWID
gene
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] FUEL TANK R&R [message #196820 is a reply to message #196817] |
Wed, 30 January 2013 05:50 |
Jim Bounds
Messages: 842
Registered: January 2004
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The gap between your body and frame is gone, that's the reason for the wear. You must maintain 1/2" gap between the 2. You need new 1/2" thick body pads to solve that wear issue. There are a slew of other things and ways folks do them-- so be it but without a good gap not only for the sender issue you found but also for the brake, air, LP gas, wires AND fuel lines you have not completed the task well and you will have issues again down the road. Next time it may be the brake lines wear through!
Jim Bounds
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________________________________
From: George Beckman <gbeckman@pggp.com>
To: gmclist@temp.gmcnet.org
Sent: Wednesday, January 30, 2013 1:53 AM
Subject: Re: [GMCnet] FUEL TANK R&R
Mr ERFisher wrote on Tue, 29 January 2013 20:44
> - did you put back hard lines?
> - did you cut a hole over the sender?
> - did you rehab the liquid separator?
> - did you solder the sender?
>
> gene
My tanks are down now. My all new hoses as of two years ago were burping gas when a fast pump clicked off when full.
We had to replace the sender in '09. The new sender's tubes were a bit longer. This allowed the end of the tube and hose to rub on the edge of the relief hole in the floor. This was the original hole. The rear tank fill vent hose had worn a hole where the interference took place.
If you are replacing a sender, check out clearances carefully. Randy and Margie Van Winkle are here and Randy relieved the original hole edge with a spade drill, tapering the edge for about four inches. Tomorrow we will see how the new "canyon" works as the tank goes up. (man the cement in the barn is coooold.)
--
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] FUEL TANK R&R [message #196824 is a reply to message #196817] |
Wed, 30 January 2013 06:36 |
mickey szilagyi
Messages: 273
Registered: January 2013
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Hi George,
You mentioned the floor being cold and in your sign off you show Howell.
Is that MI? We're in Lasning, MI.
77 Kingsley 403
Mickey
>
>
> Mr ERFisher wrote on Tue, 29 January 2013 20:44
>> - did you put back hard lines?
>> - did you cut a hole over the sender?
>> - did you rehab the liquid separator?
>> - did you solder the sender?
>>
>> gene
>
> My tanks are down now. My all new hoses as of two years ago were burping
> gas when a fast pump clicked off when full.
>
> We had to replace the sender in '09. The new sender's tubes were a bit
> longer. This allowed the end of the tube and hose to rub on the edge of
> the relief hole in the floor. This was the original hole. The rear tank
> fill vent hose had worn a hole where the interference took place.
>
> If you are replacing a sender, check out clearances carefully. Randy and
> Margie Van Winkle are here and Randy relieved the original hole edge with
> a spade drill, tapering the edge for about four inches. Tomorrow we will
> see how the new "canyon" works as the tank goes up. (man the cement in
> the barn is coooold.)
> --
> '74 Eleganza, SE, Howell + EBL
> Best Wishes,
> George
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Mickey
1977 Kingsley, 403, Lansing, MI
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| Re: [GMCnet] FUEL TANK R&R [message #196863 is a reply to message #196820] |
Wed, 30 January 2013 13:59 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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| Jim Bounds wrote on Wed, 30 January 2013 03:50 |
The gap between your body and frame is gone, that's the reason for the wear. You must maintain 1/2" gap between the 2. You need new 1/2" thick body pads to solve that wear issue. There are a slew of other things and ways folks do them-- so be it but without a good gap not only for the sender issue you found but also for the brake, air, LP gas, wires AND fuel lines you have not completed the task well and you will have issues again down the road. Next time it may be the brake lines wear through!
Jim Bounds
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Thanks, Jim. Good point. The pads are certainly not new. We had checked both the hoses to the separator and the propane line to the furnace and stove. We are still good in those locations. But, yes, this could cause biiig problems if clearance is not maintained.
I still want to warn the guys about the new senders. The steel lines are about 1" and 1.5" longer than the originals, causing them to extend beyond the scope of the relief hole in the floor. The original sender is not rubbing.
So, yes, check your pads, even if you are not doing tanks, and if you install a new sender, watch the clearance carefully.
Image of AuxTank with OEM sender: http://graestone.org/GMC/AuxTank.JPG
Image of MainTank with new sender: http://graestone.org/GMC/MainTankSender.JPG
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] FUEL TANK R&R [message #196864 is a reply to message #196824] |
Wed, 30 January 2013 14:06 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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| Mickey Szilagyi wrote on Wed, 30 January 2013 04:36 |
Hi George,
You mentioned the floor being cold and in your sign off you show Howell.
Is that MI? We're in Lasning, MI.
77 Kingsley 403
Mickey
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Good point Mickey. And I suppose cold to us is what you guys call a balmy day. At GMCMI rallies I have been shivering while talking to Dave Lenzy, and Dave was wearing shorts. He finally went to long pants one day at Amana and I almost took a picture.
I live in Colfax, California. But after a number of nights at 28 or so, the floor does seem to soak away my body heat. Ha.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: FUEL TANK R&R [message #196878 is a reply to message #196811] |
Wed, 30 January 2013 18:44 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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Senior Member |
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I'm getting ready to drop my tanks and replace all the hoses (with R7-rated lines this time). The pads between the body and frame were replaced (by my beloved PO) in 2000, so I assume they should still be OK. But might it make sense to simply install some 1/4" spacers to "drop" the tanks that much? It doesn't seem like this would be likely to put them in harm's way... or am I missing something obvious?
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] FUEL TANK R&R [message #196992 is a reply to message #196941] |
Thu, 31 January 2013 16:46 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Matt,
IIRC the top of tanks in coaches that have aluminum skinned foam insulation under the plywood come in contact with the aluminum
skin.
Can't remember when the insulation was installed.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: Matt Colie
Mark,
You are and you will not see it until you start to let the tanks down.
The way the tanks are mounted (at least in my '73) are such that getting the tank to install lower would not be practical. The
forward edge is secured by three bolts (screws) through the transverse frame. These fasteners are threaded into a piece of angle
that mounts the forward end of the support straps. While the after end is held by two J-hooks that hold the straps as that end
through a double bend in the strap, the tank has to be up against the inside of the after transverse frame to get the straps to make
up properly.
There is actually room over the tank top. I had to check this when I put in the compression fitting at the time I went to all metal
over the tanks. Even with the extra height of the fittings, there were no witness marks from those fittings.
Matt
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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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