Nemesis_152

ok, we all know that later c3s had bladders, but if you have a desire to replace the outlet fittings (with larger ones...there's a *bit* of horsepower to be developed) while retaining the bladder, how would you do it? do i need to replace the bladder with a new one? or should i just scrap the bladder and seal and sponge the tank? i want to keep from moving to a fuel cell if possible.

noonie

All your mods can be made with the bolted on oval filler assembly. No need to touch the bladder.
The bladder opening is roughly the size of the bolts ring you see.

Nemesis_152

awesome, thanks! i'm 2000 miles from the car right now, so i just needed to get my bearings on the subject...can't wait to get home now.

Nemesis_152

alright, next question: do you absolutely have to run vacuum back to the tank? will we be sucking the bladder out of the tank if we dont?

mdbelanger

Its a yes and no. If I am right? Others will confirm. The vac to the charcoal canister is to burn off contained gases. Yet there is a balance of pressures. The bladder will not collapse unless there is a bad seal as shown in the cover in the pic on the above post, or there is a rust hole in the metal tank. The bladder is just a liner to save ya *** in a rear end hit. It does'nt collapse as you burn gas.

Pic of inside.


When I cleaned this out I found 14 cents.
Someone please correct me if wrong.

Michael.

Nemesis_152

yeah, i knew it isnt designed to collapse, but i thought the vac line would be set up to keep vacuum OUTSIDE of the bladder to prevent collapse. i suppose it makes more sense that it is just a vapor removal system.

mdbelanger

Thats the way I understand it. Hopen to be confirmed,

noonie

Now that you mention it. the tee'd fitting to the canister is attached to the tank itself. That opening is sealed between the tank and the bladder. So if you put enough vacumn on that fitting and the bladder was intact, you should be able to expand a collapsed one.
Second thought, since it's tee'd, it just must equalize the pressures.


You might be onto something.

BTW
The tank pic I posted above didn't have a collapsed bladder, but I did remove it and use it to cut strips to mount the tank with.

Nemesis_152

i guess we'll jsut run it without vacuum and pull it out and sponge/seal the tank if it collapses (or go fuel cell)