CK35H Fuel tank collapsed

[zarashep]

I lost my original cap that looked like the one you showed me. The replacement tank the dealer sold me looks different - and evidently is not venting. I even phoned back to ask if there should be a hissing sound whenever I removed the cap - a sound I didn't recall from the first cap. I was told (incorrectly, I guess) that it was normal. Thanks for the photo.

 

[zarashep]

I was hoping I could re-inflate it. I worried that the pressure could blow the cap off. Do you know what PSI I should apply? Would you remove the tank first?

 

[lilranch2001]

I was hoping I could re-inflate it. I worried that the pressure could blow the cap off. Do you know what PSI I should apply? Would you remove the tank first?

I dont think I would put any more than 3-5 psi in it

 

[zarashep]

Thanks WhiskeyWizard. What dangers are there in re-inflating? If I replace the tank, I will need help in how to do it. The shop manual does not give much of a clue.

 

[blueriver]

How about filling it as full as you can and park it on the south side of a building ... the sun should expand things back into shape.

My Montana tank collapsed because the cap vent was plugged and it came back to shape this way ... may or may not work for you.

 

[MotorSeven]

I like BlueR's idea, but since it's wintertime might or might not work depending on Zara's location.
Plastic gets brittle in cold, so before trying to "inflate" it I would get it inside a heated shop and warm it up. The warmer the better and the easier it will be to get back into shape. I'm thinking pointing a kero salamander at the tractor for a couple of hrs until it's warm to the touch. If you fill to the brim when cold, then warm it up remember you will spill some fuel when you open the cap so have a catch pan underneath(oh and you might want to turn that salamander off).

 

[blueriver]

I like BlueR's idea, but since it's wintertime might or might not work depending on Zara's location.
Plastic gets brittle in cold, so before trying to "inflate" it I would get it inside a heated shop and warm it up. The warmer the better and the easier it will be to get back into shape. I'm thinking pointing a kero salamander at the tractor for a couple of hrs until it's warm to the touch. If you fill to the brim when cold, then warm it up remember you will spill some fuel when you open the cap so have a catch pan underneath(oh and you might want to turn that salamander off).

Yes I don't know his location either ... the salamander is a good idea. I know when mine happened it was summer time so thats why I threw in "South" side forthis time of year.

Next examin the cap ... for some reason its not breathing.

 

[VictorW]

Does anyone know the price of a new tank? If it's expensive, I'd go through the extra work of removing the old tank to make sure you could get it warm enough before blowing it back into shape. This would also allow you to warm the collapsed areas more so hopefully these would respond to the air pressure. If a new tank is reasonably cheap, then giving it a try in the tractor would save time if it works.

In the meantime, unless you get a new cap, loosen your fuel cap a little if running the tractor. That may save you having to spend @$60 on a new fuel pump. And the dealer that said the hissing was normal when opening the cap, :confused2: maybe he was thinking of the sealed system in todays road vehicles.

 

[mguitas]

I never heard of a fuel tank collapsing. Very odd.

 

[ritcheyvs]

Does anyone know the price of a new tank? If it's expensive, I'd go through the extra work of removing the old tank to make sure you could get it warm enough before blowing it back into shape. This would also allow you to warm the collapsed areas more so hopefully these would respond to the air pressure. If a new tank is reasonably cheap, then giving it a try in the tractor would save time if it works.

In the meantime, unless you get a new cap, loosen your fuel cap a little if running the tractor. That may save you having to spend @$60 on a new fuel pump. And the dealer that said the hissing was normal when opening the cap, :confused2: maybe he was thinking of the sealed system in todays road vehicles.

According to these guys:
OEM Parts

or OEM Parts it's about $200. But shipping and work to remove and replace could be more substantial. An unvented fuel system absolutely will collapse the tank. I'd say you have a bone to pick with the guy that sold you the unvented cap.