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ELAhrens wrote:
>
> Hello,
>
> A friend has a CJ?? with a plastic or fibreglass type fuel tank in it that
> has a crack.
> Is there any way to repair it?
>
> TIA
>
> Erik

 

Polyethylene polymer is very subject to fatigue failure. Plastic Welding
can be accomplished with GREAT difficulty and required an EXTREME
'artist' to do the repair, .... but since a crack signifies either
flexure failure or poor tankage design, the repair will be also
vulnerable to the same forces that allowed the failure in the first place.
Rotomolded replacement fuel tanks are fairly cheap.... and just as labor
intensive to replace as to remove and repair a 'gone' tank.
I usually search roncoplastics.com before even thinking of repairing or
rebuilding a (marine fuel) tank.
If you 'handy' with FRG layup you can bujiuld your own using/buying
polethylene lined fiberglass sheets and then forming the joints, etc.
with straight epoxy/cloth - cheaper to buy.

Earle Horton wrote:
> I drove around for six years in an A100 Dodge van with a patch on the bottom
> of the tank, but that was a metal tank patched with fiberglass body filler.
> Fiberglass body filler is great stuff, by the way. I miss that van
> sometimes. I think that it was the only vehicle I have ever gotten laid in.
> There was that one other time I almost got laid in a Chevy station wagon in
> the sixties, but I guess that doesn't count, because I was so drunk I fell
> out of the car before I was able to consumate the encounter, but I
> digress...
>
> Anyway, I *think* that these tanks are polyethylene (polythene to our
> British friends), and I *think* that in principle polyethylene can be welded
> with heat. However, age and exposure to fuel are likely to make the
> material more brittle and therefore make welding problematical. If it were
> mine I would rough up the surface around the crack using a wire brush and
> try to make a patch using silicon sealer, the good stuff.
>
> Earle
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3F953F23.8D7BC350@sympatico.ca...
>
>>In theory yes.
>>
>>When I dropped my tank on a trail and tore a hole in the corner I called
>>around to plastics places and tank makers and found one who said they
>>could 'try' and fix it, but they wouldn't offer a warranty for the work.
>>
>>I found a used tank instead.
>>
>>Mike
>>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>88 Cherokee 235 BFG AT's
>>
>>ELAhrens wrote:
>>
>>>Hello,
>>>
>>>A friend has a CJ?? with a plastic or fibreglass type fuel tank in it
>>
> that
>
>>>has a crack.
>>>Is there any way to repair it?
>>>
>>>TIA
>>>
>>>Erik
>>
>
>

 

Polyethylene polymer is very subject to fatigue failure. Plastic Welding
can be accomplished with GREAT difficulty and required an EXTREME
'artist' to do the repair, .... but since a crack signifies either
flexure failure or poor tankage design, the repair will be also
vulnerable to the same forces that allowed the failure in the first place.
Rotomolded replacement fuel tanks are fairly cheap.... and just as labor
intensive to replace as to remove and repair a 'gone' tank.
I usually search roncoplastics.com before even thinking of repairing or
rebuilding a (marine fuel) tank.
If you 'handy' with FRG layup you can bujiuld your own using/buying
polethylene lined fiberglass sheets and then forming the joints, etc.
with straight epoxy/cloth - cheaper to buy.

Earle Horton wrote:
> I drove around for six years in an A100 Dodge van with a patch on the bottom
> of the tank, but that was a metal tank patched with fiberglass body filler.
> Fiberglass body filler is great stuff, by the way. I miss that van
> sometimes. I think that it was the only vehicle I have ever gotten laid in.
> There was that one other time I almost got laid in a Chevy station wagon in
> the sixties, but I guess that doesn't count, because I was so drunk I fell
> out of the car before I was able to consumate the encounter, but I
> digress...
>
> Anyway, I *think* that these tanks are polyethylene (polythene to our
> British friends), and I *think* that in principle polyethylene can be welded
> with heat. However, age and exposure to fuel are likely to make the
> material more brittle and therefore make welding problematical. If it were
> mine I would rough up the surface around the crack using a wire brush and
> try to make a patch using silicon sealer, the good stuff.
>
> Earle
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3F953F23.8D7BC350@sympatico.ca...
>
>>In theory yes.
>>
>>When I dropped my tank on a trail and tore a hole in the corner I called
>>around to plastics places and tank makers and found one who said they
>>could 'try' and fix it, but they wouldn't offer a warranty for the work.
>>
>>I found a used tank instead.
>>
>>Mike
>>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>88 Cherokee 235 BFG AT's
>>
>>ELAhrens wrote:
>>
>>>Hello,
>>>
>>>A friend has a CJ?? with a plastic or fibreglass type fuel tank in it
>>
> that
>
>>>has a crack.
>>>Is there any way to repair it?
>>>
>>>TIA
>>>
>>>Erik
>>
>
>

 

Polyethylene polymer is very subject to fatigue failure. Plastic Welding
can be accomplished with GREAT difficulty and required an EXTREME
'artist' to do the repair, .... but since a crack signifies either
flexure failure or poor tankage design, the repair will be also
vulnerable to the same forces that allowed the failure in the first place.
Rotomolded replacement fuel tanks are fairly cheap.... and just as labor
intensive to replace as to remove and repair a 'gone' tank.
I usually search roncoplastics.com before even thinking of repairing or
rebuilding a (marine fuel) tank.
If you 'handy' with FRG layup you can bujiuld your own using/buying
polethylene lined fiberglass sheets and then forming the joints, etc.
with straight epoxy/cloth - cheaper to buy.

Earle Horton wrote:
> I drove around for six years in an A100 Dodge van with a patch on the bottom
> of the tank, but that was a metal tank patched with fiberglass body filler.
> Fiberglass body filler is great stuff, by the way. I miss that van
> sometimes. I think that it was the only vehicle I have ever gotten laid in.
> There was that one other time I almost got laid in a Chevy station wagon in
> the sixties, but I guess that doesn't count, because I was so drunk I fell
> out of the car before I was able to consumate the encounter, but I
> digress...
>
> Anyway, I *think* that these tanks are polyethylene (polythene to our
> British friends), and I *think* that in principle polyethylene can be welded
> with heat. However, age and exposure to fuel are likely to make the
> material more brittle and therefore make welding problematical. If it were
> mine I would rough up the surface around the crack using a wire brush and
> try to make a patch using silicon sealer, the good stuff.
>
> Earle
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3F953F23.8D7BC350@sympatico.ca...
>
>>In theory yes.
>>
>>When I dropped my tank on a trail and tore a hole in the corner I called
>>around to plastics places and tank makers and found one who said they
>>could 'try' and fix it, but they wouldn't offer a warranty for the work.
>>
>>I found a used tank instead.
>>
>>Mike
>>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>88 Cherokee 235 BFG AT's
>>
>>ELAhrens wrote:
>>
>>>Hello,
>>>
>>>A friend has a CJ?? with a plastic or fibreglass type fuel tank in it
>>
> that
>
>>>has a crack.
>>>Is there any way to repair it?
>>>
>>>TIA
>>>
>>>Erik
>>
>
>

 

chewing gum works. I did a trail repair with 10 sticks on a Landy, and it
worked so well that I [blush] never got round to doing it properly. That was
15 years ago ...


Dave Milne, Scotland
'99 TJ 4.0 Sahara

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F954EE2.91830DF1@sympatico.ca...
: Silicone will not work.
:
: Silicone goes jelly in the presence of raw gas. Real fast too!
:
: I tried to put a patch on my tank when I tossed it in the back torn
: corner up with the filler tubes plugged with chunks of trees. I ran my
: front diff vent line as a gas line extension up around and into the hole
: and tried RTV to stop the splashes and smell. It went jelly. So did
: duct tape so I just stuffed a plastic bag in the hole to slow down
: splashing.
:
: Mike
:
: Earle Horton wrote:
: >
: > I drove around for six years in an A100 Dodge van with a patch on the
bottom
: > of the tank, but that was a metal tank patched with fiberglass body
filler.
: > Fiberglass body filler is great stuff, by the way. I miss that van
: > sometimes. I think that it was the only vehicle I have ever gotten laid
in.
: > There was that one other time I almost got laid in a Chevy station wagon
in
: > the sixties, but I guess that doesn't count, because I was so drunk I
fell
: > out of the car before I was able to consumate the encounter, but I
: > digress...
: >
: > Anyway, I *think* that these tanks are polyethylene (polythene to our
: > British friends), and I *think* that in principle polyethylene can be
welded
: > with heat. However, age and exposure to fuel are likely to make the
: > material more brittle and therefore make welding problematical. If it
were
: > mine I would rough up the surface around the crack using a wire brush
and
: > try to make a patch using silicon sealer, the good stuff.
: >
: > Earle
: >
: > "Mike Romain" <romainm@sympatico.ca> wrote in message
: > news:3F953F23.8D7BC350@sympatico.ca...
: > > In theory yes.
: > >
: > > When I dropped my tank on a trail and tore a hole in the corner I
called
: > > around to plastics places and tank makers and found one who said they
: > > could 'try' and fix it, but they wouldn't offer a warranty for the
work.
: > >
: > > I found a used tank instead.
: > >
: > > Mike
: > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
: > > 88 Cherokee 235 BFG AT's
: > >
: > > ELAhrens wrote:
: > > >
: > > > Hello,
: > > >
: > > > A friend has a CJ?? with a plastic or fibreglass type fuel tank in
it
: > that
: > > > has a crack.
: > > > Is there any way to repair it?
: > > >
: > > > TIA
: > > >
: > > > Erik

 

chewing gum works. I did a trail repair with 10 sticks on a Landy, and it
worked so well that I [blush] never got round to doing it properly. That was
15 years ago ...


Dave Milne, Scotland
'99 TJ 4.0 Sahara

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F954EE2.91830DF1@sympatico.ca...
: Silicone will not work.
:
: Silicone goes jelly in the presence of raw gas. Real fast too!
:
: I tried to put a patch on my tank when I tossed it in the back torn
: corner up with the filler tubes plugged with chunks of trees. I ran my
: front diff vent line as a gas line extension up around and into the hole
: and tried RTV to stop the splashes and smell. It went jelly. So did
: duct tape so I just stuffed a plastic bag in the hole to slow down
: splashing.
:
: Mike
:
: Earle Horton wrote:
: >
: > I drove around for six years in an A100 Dodge van with a patch on the
bottom
: > of the tank, but that was a metal tank patched with fiberglass body
filler.
: > Fiberglass body filler is great stuff, by the way. I miss that van
: > sometimes. I think that it was the only vehicle I have ever gotten laid
in.
: > There was that one other time I almost got laid in a Chevy station wagon
in
: > the sixties, but I guess that doesn't count, because I was so drunk I
fell
: > out of the car before I was able to consumate the encounter, but I
: > digress...
: >
: > Anyway, I *think* that these tanks are polyethylene (polythene to our
: > British friends), and I *think* that in principle polyethylene can be
welded
: > with heat. However, age and exposure to fuel are likely to make the
: > material more brittle and therefore make welding problematical. If it
were
: > mine I would rough up the surface around the crack using a wire brush
and
: > try to make a patch using silicon sealer, the good stuff.
: >
: > Earle
: >
: > "Mike Romain" <romainm@sympatico.ca> wrote in message
: > news:3F953F23.8D7BC350@sympatico.ca...
: > > In theory yes.
: > >
: > > When I dropped my tank on a trail and tore a hole in the corner I
called
: > > around to plastics places and tank makers and found one who said they
: > > could 'try' and fix it, but they wouldn't offer a warranty for the
work.
: > >
: > > I found a used tank instead.
: > >
: > > Mike
: > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
: > > 88 Cherokee 235 BFG AT's
: > >
: > > ELAhrens wrote:
: > > >
: > > > Hello,
: > > >
: > > > A friend has a CJ?? with a plastic or fibreglass type fuel tank in
it
: > that
: > > > has a crack.
: > > > Is there any way to repair it?
: > > >
: > > > TIA
: > > >
: > > > Erik

 

chewing gum works. I did a trail repair with 10 sticks on a Landy, and it
worked so well that I [blush] never got round to doing it properly. That was
15 years ago ...


Dave Milne, Scotland
'99 TJ 4.0 Sahara

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F954EE2.91830DF1@sympatico.ca...
: Silicone will not work.
:
: Silicone goes jelly in the presence of raw gas. Real fast too!
:
: I tried to put a patch on my tank when I tossed it in the back torn
: corner up with the filler tubes plugged with chunks of trees. I ran my
: front diff vent line as a gas line extension up around and into the hole
: and tried RTV to stop the splashes and smell. It went jelly. So did
: duct tape so I just stuffed a plastic bag in the hole to slow down
: splashing.
:
: Mike
:
: Earle Horton wrote:
: >
: > I drove around for six years in an A100 Dodge van with a patch on the
bottom
: > of the tank, but that was a metal tank patched with fiberglass body
filler.
: > Fiberglass body filler is great stuff, by the way. I miss that van
: > sometimes. I think that it was the only vehicle I have ever gotten laid
in.
: > There was that one other time I almost got laid in a Chevy station wagon
in
: > the sixties, but I guess that doesn't count, because I was so drunk I
fell
: > out of the car before I was able to consumate the encounter, but I
: > digress...
: >
: > Anyway, I *think* that these tanks are polyethylene (polythene to our
: > British friends), and I *think* that in principle polyethylene can be
welded
: > with heat. However, age and exposure to fuel are likely to make the
: > material more brittle and therefore make welding problematical. If it
were
: > mine I would rough up the surface around the crack using a wire brush
and
: > try to make a patch using silicon sealer, the good stuff.
: >
: > Earle
: >
: > "Mike Romain" <romainm@sympatico.ca> wrote in message
: > news:3F953F23.8D7BC350@sympatico.ca...
: > > In theory yes.
: > >
: > > When I dropped my tank on a trail and tore a hole in the corner I
called
: > > around to plastics places and tank makers and found one who said they
: > > could 'try' and fix it, but they wouldn't offer a warranty for the
work.
: > >
: > > I found a used tank instead.
: > >
: > > Mike
: > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
: > > 88 Cherokee 235 BFG AT's
: > >
: > > ELAhrens wrote:
: > > >
: > > > Hello,
: > > >
: > > > A friend has a CJ?? with a plastic or fibreglass type fuel tank in
it
: > that
: > > > has a crack.
: > > > Is there any way to repair it?
: > > >
: > > > TIA
: > > >
: > > > Erik