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Re: [GMCnet] New plastic gas tanks needed [message #336684]

Mon, 03 September 2018 17:08

k2gkk

Messages: 4452
Registered: November 2009

Karma: -8

Senior Member

Ethanol-poisoned gasoline has reportedly ruined hundreds (maybe more) of boat plastic/fiberglass fuel tanks and taken the engines down with them. I would be VERY leery of plastic fuel tanks unless proven to be immune to deterioration by ethanol-added gasoline.

D C "Mac" Macdonald
Amateur Radio K2GKK
Since 30 November '53
USAF and FAA, Retired
Member GMCMI & Classics
Oklahoma City, OK
"The Money Pit"
TZE166V101966
'76 ex-Palm Beach
k2gkk + hotmail dot com
________________________________
From: Gmclist on behalf of Mike Kilroy
Sent: Monday, September 3, 2018 17:07
To: gmclist
Subject: [GMCnet] New plastic gas tanks needed

We have a perfectly good 1973 GMC we rebuilt to perfection... 10 years ago... We made it mechanically sound. I removed and coated both rusted gas tanks. That lasted a few years. Now they leak again. If I fill them, the engine runs fine but then leaks all over.

It is a dang shame to have a good GMC motorhome sitting in the barn not able to even be driven into town.

Does anyone have a source yet of reasonable priced replacement bolt in tanks? $ 500.00 is not reasonable. Plastic preferred?

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Re: [GMCnet] New plastic gas tanks needed [message #336687 is a reply to message #336684]

Mon, 03 September 2018 17:40

Mike Kilroy

Messages: 80
Registered: July 2006
Location: Farmersville, OH (near D...

Karma: 0

Member

Isn't every car fuel tank some form of plastic today? How can millions of cars survive the ethanol?

From: "D C _Mac_ Macdonald"
To: "Mike Kilroy" , "gmclist"
Sent: Monday, September 3, 2018 6:08:20 PM
Subject: Re: New plastic gas tanks needed

Ethanol-poisoned gasoline has reportedly ruined hundreds (maybe more) of boat plastic/fiberglass fuel tanks and taken the engines down with them. I would be VERY leery of plastic fuel tanks unless proven to be immune to deterioration by ethanol-added gasoline.

D C "Mac" Macdonald
Amateur Radio K2GKK
Since 30 November '53
USAF and FAA, Retired
Member GMCMI & Classics
Oklahoma City, OK
"The Money Pit"
TZE166V101966
'76 ex-Palm Beach
k2gkk + hotmail dot com

From: Gmclist on behalf of Mike Kilroy
Sent: Monday, September 3, 2018 17:07
To: gmclist
Subject: [GMCnet] New plastic gas tanks needed
We have a perfectly good 1973 GMC we rebuilt to perfection... 10 years ago... We made it mechanically sound. I removed and coated both rusted gas tanks. That lasted a few years. Now they leak again. If I fill them, the engine runs fine but then leaks all over.

It is a dang shame to have a good GMC motorhome sitting in the barn not able to even be driven into town.

Does anyone have a source yet of reasonable priced replacement bolt in tanks? $ 500.00 is not reasonable. Plastic preferred?

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Mike (AC8V) & Vickie Kilroy
'73 Canyon Land 26' sidebath
455/ceramic filled crossovers

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Re: [GMCnet] New plastic gas tanks needed [message #336691 is a reply to message #336687]

Mon, 03 September 2018 18:08

JerryW

Messages: 256
Registered: August 2018

Karma: 1

Senior Member

There are thousands of different plastics. Some will stand up to gasoline and ethanol. There are many very expensive ones that totally hold up but you’d have to refinance your motorhome (or house) to buy them. Fortunately a good plastic is cross linked high density polyethylene (HDPE). Both the high density and the cross linking of the plastic polymer is important. Regular polyethylene will not hold up.

I replaced a rusted steel Jeep gas tanks several years back and it seems to have held up well. It is made of high density cross linked polyethylene.

I don’t know who might have ones to fit a GMC motorhome but Jim Kanomata might.

The reason that GMC motorhome tanks rust out is due to water standing in them. That can easily happen from storing a partly filled tank. Water vapor in the air will enter through the vents. It is drawn in when the tanks cool down. However when the water vapor in the air cools it will condense and settle to the bottom of the tank as liquid water. Day after day this occurs as the air temperature warms and cools. A significant amount of water can build up and rust the tanks from the inside.
One way to prevent this is to fill your tanks before storing the motorhome.
However be aware that some gasoline cannot be stored for months. You can add a stabilizer to the gas but the best solution is to use the motorhome frequently and put in more new gasoline.

Perhaps Rob Mueller can tell us what he does when he leaves his GMC in Houston (where it is often very humid) when he goes off to Australia.

Emery Stora
77 Kingsley
Frederick, CO

> On Sep 3, 2018, at 4:40 PM, Mike Kilroy wrote:
>
> Isn't every car fuel tank some form of plastic today? How can millions of cars survive the ethanol?

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Re: [GMCnet] New plastic gas tanks needed [message #336697 is a reply to message #336691]

Mon, 03 September 2018 20:45

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

Karma: 10

Senior Member

Every tank that I have worked on since model year 1996 has been plastic.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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Re: [GMCnet] New plastic gas tanks needed [message #336710 is a reply to message #336697]

Mon, 03 September 2018 23:13

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

It is all about numbers.
Tooling up is the big cost,
I have dumped money on few projects, but not worth it as I am now 75 and I
need to put more emphases on our Air Filter side as it is the profit center
and GMC is a division that will taper down should I pass.
Currently we are growing the SOB RV side as it has better growth potential.
We are a multi Million Corp. so contrary to belief, are stuctured to
continue.

On Mon, Sep 3, 2018 at 7:02 PM Ken Burton wrote:

> Every tank that I have worked on since model year 1996 has been plastic.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
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--
Jim Kanomata
Applied/GMC, Newark,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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