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S/V/C Gas Tank Reinforcement

Rusty_ratchet

Rusty_ratchet

Member
Joined
Apr 14, 2015
Location
Southwest
1997 Volvo S90

I had to cut off the head of a bolt at the driveshaft/differential. I got out the bolt, but had some collateral damage when I gouged the gas tank with my angle grinder (see photo below). It can be seen that I didn't puncture the gas tank, but would feel better reinforcing/patching it. I found three ways to do this, and would appreciate thoughts on their effectiveness or alternatives to the methods below.

1. Fiberglass patch kit
2. JB Weld
3. Poly tubing / heat gun, although some report that this is not always successful.



IMG4044.jpg
 
JB weld. Clean the surfaces with abrasives and then compatible solvents and then just put a nice bead of JB weld over the crack and be sure to extend at least 3/16" beyond the damage in all directions.
 
Another tip:

If the damage is ona vertical or downward facing surface, let the epoxy pot for a few minutes before applying, otherwise it will drop and distort.
 
Thanks for the replies. I'll forward the thread to my dad and see what he want's to do with the tank.

Kjets: That's too bad about the guy cutting through the fuel line. I hope never encounter anything like that :nod:
 
Rusty_ratchet said:
Thanks for the replies. I'll forward the thread to my dad and see what he want's to do with the tank.

Kjets: That's too bad about the guy cutting through the fuel line. I hope never encounter anything like that :nod:
Click to expand...

Dab of undercoating on the scratch.

It was just a grandpa series. No loss.

Gasoline fires grow fast when fed compressed air! Better to piss on the fire.
 
The tank is HDPE so fiberglass or JB weld is not going to stick to it.

If it was deep enough to worry me I would run a weld down the cut.

You can make GRP stick by heating the plastic and pressing in a cloth roll so the cloth sticks to the plastic and the GRP will then stick to teh cloth
 
classicswede said:
The tank is HDPE so fiberglass or JB weld is not going to stick to it.

If it was deep enough to worry me I would run a weld down the cut.

You can make GRP stick by heating the plastic and pressing in a cloth roll so the cloth sticks to the plastic and the GRP will then stick to teh cloth
Click to expand...

How deep and you would/wouldn't worry? I think the cut is about 1/16" (1.6mm) deep.
 
Thinnest parts of the tank are around 4mm going up to just over 6mm going off ones I have cut through.

At that depth I'd not be loosing any sleep over it.

If you want it welding any bodyshop that does bumper repairs could weld it - unless you know someone who does chemical plant plastics as they would have the gear and be used to doing quality welds
 
classicswede said:
Thinnest parts of the tank are around 4mm going up to just over 6mm going off ones I have cut through.

At that depth I'd not be loosing any sleep over it.

If you want it welding any bodyshop that does bumper repairs could weld it - unless you know someone who does chemical plant plastics as they would have the gear and be used to doing quality welds
Click to expand...

This is helpful. Thanks!
 
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