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Cannot seat fuel overflow tanks
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wpicotte
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PostPosted: Tue Jun 24, 2025 2:13 pm    Post subject: Cannot seat fuel overflow tanks Reply with quote

I've resealed my 87 Vanagon gas tank and have replacement fuel overflow / vapor tanks, as well. I'm struggling mightily to seat the overflow tanks, especially on the passenger side.

The hard plastic line is running over the inside, angled corner and best I can tell, is not creating interference. However, after running the bolt though the forward slot, I cannot get adequate force on the tank to mate the rear side notch. I've tried from every angle and it just doesn't want to go.

I'm tempted to elongate the bolt slot slightly so that with a little flex, the bolt can thread through with the rear notch is already in place.

Is there a trick to these things that I'm missing?
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MarkWard
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PostPosted: Tue Jun 24, 2025 2:46 pm    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

They do fight. Clean the rectangular recess in the fender well, and use a liberal spray of silicone on the fender and the tank. That usually will let them fully seat.
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AlfromNH
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PostPosted: Tue Jun 24, 2025 3:43 pm    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

I recently struggled with this. I found by putting the tank over the bolt first, I was then able to jam it up into the “pocket” in the fender well.
Like everything else related to the tank reseal, it was way more trouble than it would be for someone with an actual lift…
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wpicotte
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PostPosted: Tue Jun 24, 2025 5:52 pm    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

AlfromNH wrote:
I recently struggled with this. I found by putting the tank over the bolt first, I was then able to jam it up into the “pocket” in the fender well.
Like everything else related to the tank reseal, it was way more trouble than it would be for someone with an actual lift…


Yah, that's the only way to install it, I believe.

I have not been able to get the new tanks in. They're plastic replacements from Van Cafe. I was able to snap the original right into place.
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Wildthings
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PostPosted: Tue Jun 24, 2025 8:30 pm    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

Figure out a lever system to force the tank into position, and yes use some kind of lube like spray silicone or even dish soap.
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vanis13
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PostPosted: Tue Jun 24, 2025 8:39 pm    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

remembering from last time I did this job, I elongated the hole that takes the threaded stud and that helped a ton.
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Timwhy
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PostPosted: Wed Jun 25, 2025 2:36 am    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

Have seated these tanks a few times on my Vans. I used a block of wood and rubber mallet to pop them back in place.

Image may have been reduced in size. Click image to view fullscreen.

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jlrftype7
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PostPosted: Wed Jun 25, 2025 5:45 am    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

TO quote Alfrom NH
""""""I recently struggled with this. I found by putting the tank over the bolt first, I was then able to jam it up into the “pocket” in the fender well.
Like everything else related to the tank reseal, it was way more trouble than it would be for someone with an actual lift…"""""

I installed the Aluminum Tanks from Van Cafe. If you thought the old plastic tanks didn't flex much when reinstalling, try welded Alloy tanks... Razz Razz

And I WAS on a lift with the Vanagon. Anyway, it's not an easy job, but this technique ^^^^ was what worked for me as well.
I added White Lithium Grease on the backside of the tanks and the mating body since the tanks were metal.
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wpicotte
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PostPosted: Wed Jun 25, 2025 8:55 am    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

vanis13 wrote:
remembering from last time I did this job, I elongated the hole that takes the threaded stud and that helped a ton.


Yep, did the same on the passenger side but still no joy.
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wpicotte
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PostPosted: Wed Jun 25, 2025 8:55 am    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

Timwhy wrote:
Have seated these tanks a few times on my Vans. I used a block of wood and rubber mallet to pop them back in place.

Image may have been reduced in size. Click image to view fullscreen.


Is this with the original tanks or replacements?
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wpicotte
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PostPosted: Wed Jun 25, 2025 8:58 am    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

jlrftype7 wrote:
TO quote Alfrom NH
""""""I recently struggled with this. I found by putting the tank over the bolt first, I was then able to jam it up into the “pocket” in the fender well.
Like everything else related to the tank reseal, it was way more trouble than it would be for someone with an actual lift…"""""

I installed the Aluminum Tanks from Van Cafe. If you thought the old plastic tanks didn't flex much when reinstalling, try welded Alloy tanks... Razz Razz

And I WAS on a lift with the Vanagon. Anyway, it's not an easy job, but this technique ^^^^ was what worked for me as well.
I added White Lithium Grease on the backside of the tanks and the mating body since the tanks were metal.


Good to know. I had a leak from the overflow on the driver side prior to this most recent escapade. Hoping it came from some of the old hoses I've relaced, but if the leak persists then plan B is an aluminim tank.
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Timwhy
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PostPosted: Wed Jun 25, 2025 9:05 am    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

wpicotte wrote:
Timwhy wrote:


Is this with the original tanks or replacements?


Original tanks
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wpicotte
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PostPosted: Wed Jun 25, 2025 9:10 am    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

Timwhy wrote:
wpicotte wrote:
Timwhy wrote:


Is this with the original tanks or replacements?


Original tanks


Thanks. I was able to snap the originals back into place by hand. The dimple on replacements look slightly different, in that their edges are more rounded. This may be part of the issue, not sure. Regardless, no amount of force that I've applied has gotten them into place.
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bobbyblack Premium Member
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PostPosted: Wed Jun 25, 2025 12:44 pm    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

Like others answering in this thread, I have had multiple difficulties getting my tanks reinserted into the dimple. I used a 5 foot piece of 2x4, and made a fulcrum on the tire or another piece of wood to create massive force. They did pop in, I am pretty sure at near breaking points. I'm glad there are replacement options.
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SCM
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PostPosted: Wed Jun 25, 2025 1:23 pm    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

jlrftype7 wrote:
If you thought the old plastic tanks didn't flex much when reinstalling, try welded Alloy tanks... Razz Razz
.


I'm glad to hear it wasn't just my own ineptitude.

I battled with my alloy tanks for quite some time then pulled out the utility knife, cut away some undercoating that was in the recesses and added a few thick washers to the bolts between the tank and wheel well so that I could tighten the bolts without popping the tanks out of the recess.

Why those fine German Engineers didn't just use TWO bolts to attach the tanks is beyond me.
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jlrftype7
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PostPosted: Thu Jun 26, 2025 5:32 am    Post subject: Re: Cannot seat fuel overflow tanks Reply with quote

SCM wrote:
jlrftype7 wrote:
If you thought the old plastic tanks didn't flex much when reinstalling, try welded Alloy tanks... Razz Razz
.


I'm glad to hear it wasn't just my own ineptitude.

I battled with my alloy tanks for quite some time then pulled out the utility knife, cut away some undercoating that was in the recesses and added a few thick washers to the bolts between the tank and wheel well so that I could tighten the bolts without popping the tanks out of the recess.
Why those fine German Engineers didn't just use TWO bolts to attach the tanks is beyond me.


"""Why those fine German Engineers didn't just use TWO bolts to attach the tanks is beyond me."""
Those bolt costs add up when you're making tens of thousands of vehicles.... Razz Razz
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