carbon canister mount Options

[partwerks]

On the carbon canister mount on the tank, I'm wondering how that band that goes around the canister mounts to that bracket?

The canister I have is the plastic one, and the tank is out of a 74, FWIW.

[Steve]

On the carbon canister mount on the tank, I'm wondering how that band that goes around the canister mounts to that bracket?

The canister I have is the plastic one, and the tank is out of a 74, FWIW.

I thought all the plastic ones were installed in the engine compartment?
http://www.914world.com/bbs2/index.php?showtopic=108524

[partwerks]

This one is plastic, but not sure if I have the correct canister for the tank? Not making sense how that band hooks up to that mounting bracket on the tank??

Do I have the correct canister, or do I need the metal one?

Any pictures of how it attaches to the bracket on the tank?

[wonkipop]

i could be wrong, but originally metal cans were in frunk.
plastic cans go with change to engine bay.

if you look close at frunk cans the mounting clip is different and seems to incorporate an extra ring clip off it for one of the hoses that goes around the can.

i'd say what you have in your boxes is an engine bay can set up.

[partwerks]

i could be wrong, but originally metal cans were in frunk.
plastic cans go with change to engine bay.

if you look close at frunk cans the mounting clip is different and seems to incorporate an extra ring clip off it for one of the hoses that goes around the can.

i'd say what you have in your boxes is an engine bay can set up.

I'm guessing that is why that bracket don't make any sense in how it would hook to the tab on the tank.


I wonder if the metal clamp on this canister would work on a metal canister?

[wonkipop]

the parts book says up to 73 is frunk.
and 74 is engine bay.

but we know they made some 74s with the frunk can.

---

what has become a little clearer with some other research amongst members with 1.8s is that it looks like 1.8 L jets don't start coming off production line until november 73.
about the time if i recall right from other reading that the change from front to engine bay happens.

i can't know this for sure, but i think its likely that (just about) all 74 1.8s had the engine bay can.
given dates.

and that its the 2.0 L from early in the 74 MY run that get the frunk tank?
going on what we found they only seemed to be making 2.0 L for the first few months of 74 MY production?

[partwerks]

the parts book says up to 73 is frunk.
and 74 is engine bay.

but we know they made some 74s with the frunk can.

---

what has become a little clearer with some other research amongst members with 1.8s is that it looks like 1.8 L jets don't start coming off production line until november 73.
about the time if i recall right from other reading that the change from front to engine bay happens.

i can't know this for sure, but i think its likely that all 74 1.8s had the engine bay can.
given dates.

and that its the 2.0 L from early in the 74 MY run that get the frunk tank?
going on what we found they only seemed to be making 2.0 L for the first few months of 74 MY production?

Does the steel tank have a different style of retaining strap?
Looks like it hooks in on one end, and bolts to the tab on the tank?

I'm not putting it in the engine bay.

[partwerks]

Looks like my candidate gas tank is missing some small tab next to the seam, that would hook one end of the carbon canister strap to, then the other would go to the existing bracket where it bolts into at?

http://www.914world.com/bbs2/index.php?showtopic=108524

[wonkipop]

sure looks like there is something on the seam it clips to.
strap looks like its got a slot in it which engages with a tab on tank seam?
then it just bolts down at the rear of the tank?

nothing like that on my gas tank which is a engine bay can.
must have deleted the tab.

lots of small little detail changes on these cars to trip things up hey. (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/beerchug.gif)

[partwerks]

sure looks like there is something on the seam it clips to.
strap looks like its got a slot in it which engages with a tab on tank seam?
then it just bolts down at the rear of the tank?

nothing like that on my gas tank which is a engine bay can.
must have deleted the tab.

lots of small little detail changes on these cars to trip things up hey. (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/beerchug.gif)

I could probably either get a tab from a junk tank, or try and make a hook for it, once I come up with the correct strap.

Can see the hook in this ad.

https://www.ebay.com/itm/113974121688?epid=...NoAAOSwvGtd0cfH

[wonkipop]

sure looks like there is something on the seam it clips to.
strap looks like its got a slot in it which engages with a tab on tank seam?
then it just bolts down at the rear of the tank?

nothing like that on my gas tank which is a engine bay can.
must have deleted the tab.

lots of small little detail changes on these cars to trip things up hey. (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/beerchug.gif)

I could probably either get a tab from a junk tank, or try and make a hook for it, once I come up with the correct strap.

Can see the hook in this ad.

https://www.ebay.com/itm/113974121688?epid=...NoAAOSwvGtd0cfH

looks like it has the hook, down the far end.
the other tab closer to the middle is for the expansion tank.
says its a 72 tank so it should be right.

its also got that bracket on the back for mounting the can.
that bracket is absent on my later 74 tank.

[wonkipop]

its interesting because your gas tank has the back bracket there to bolt the can to.
but its missing the little tab on the seam.
might have broken off at some stage.

mine does not have that back bracket.
which makes sense - why would you bother anymore.

EDIT
if you go here, page 2 of our thread looking at 1.8s.
randy had the earliest of the 1.8s amongst us.
a plastic can in the frunk.
i reckon they were using up gas tanks they had?
randy says his car is vey original.
it looks like very original in photos.
i think only a very few very early 1.8s in nov 73 would have got this frunk can.
maybe you can see enough in this photo.
or someone can photograph the detail for you off a frunk car.

http://www.914world.com/bbs2/index.php?sho...56961&st=20

[wonkipop]

looks like its a hook more or less.

[JamesM]

On the carbon canister mount on the tank, I'm wondering how that band that goes around the canister mounts to that bracket?

The canister I have is the plastic one, and the tank is out of a 74, FWIW.

There were 3 different straps/mounting positions used across production years. The strap you show in your picture hangs the plastic canister from a small stud on the rear firewall in the engine bay. This strap was only used on a portion of model year 74 cars. Early 74 cars mounted the canister on the gas tank and in 75 they moved the canister again using yet another style of bracket to mount the canister to the battery hold down bolt.

The plastic canister will work on the front tank however you will need the appropriate strap to mount it and only IF you have the early gas tank. Later gas tanks and some of the repos do not have the provisions to mount the canister to them.

An early canister mounting strap should be pretty easy to come by as there were a TON of them produced, I think I have a few spares myself. Please dont trash that 74 strap though as they seem to be the hardest to come by, at least it was when I had to find one for my Bumblebee.

[JamesM]

the parts book says up to 73 is frunk.
and 74 is engine bay.

but we know they made some 74s with the frunk can.

---

what has become a little clearer with some other research amongst members with 1.8s is that it looks like 1.8 L jets don't start coming off production line until november 73.
about the time if i recall right from other reading that the change from front to engine bay happens.

i can't know this for sure, but i think its likely that all 74 1.8s had the engine bay can.
given dates.

and that its the 2.0 L from early in the 74 MY run that get the frunk tank?
going on what we found they only seemed to be making 2.0 L for the first few months of 74 MY production?

I believe the vin number ranges for the front/rear canister change over in 74 are known (I swear I found them somewhere last time I had to look into this.)

I can confirm both exist though as I have had 2 74 2.0 cars, one that had the front mounted canister and and LE that has the rear mounted canister.

[wonkipop]

the parts book says up to 73 is frunk.
and 74 is engine bay.

but we know they made some 74s with the frunk can.

---

what has become a little clearer with some other research amongst members with 1.8s is that it looks like 1.8 L jets don't start coming off production line until november 73.
about the time if i recall right from other reading that the change from front to engine bay happens.

i can't know this for sure, but i think its likely that all 74 1.8s had the engine bay can.
given dates.

and that its the 2.0 L from early in the 74 MY run that get the frunk tank?
going on what we found they only seemed to be making 2.0 L for the first few months of 74 MY production?

I believe the vin number ranges for the front/rear canister change over in 74 are known (I swear I found them somewhere last time I had to look into this.)

I can confirm both exist though as I have had 2 74 2.0 cars, one that had the front mounted canister and and LE that has the rear mounted canister.

yes. thats pretty interesting stuff JamesM.

if you re-find that vin number change over please post it up.
i had a bit of a search but i couldn't get it to come up.
i know they were having a bit of a go at nailing it down for the last edition of the restorer's guide. but i couldn't find out if they succeeded. i don't have a latest ed of that, just my old and by now very obsolete edition 1.

as to the plumbing of the can in the engine bay - there is another argument. (IMG:style_emoticons/default/smile.gif)

[wonkipop]

On the carbon canister mount on the tank, I'm wondering how that band that goes around the canister mounts to that bracket?

The canister I have is the plastic one, and the tank is out of a 74, FWIW.

There were 3 different straps/mounting positions used across production years. The strap you show in your picture hangs the plastic canister from a small stud on the rear firewall in the engine bay. This strap was only used on a portion of model year 74 cars. Early 74 cars mounted the canister on the gas tank and in 75 they moved the canister again using yet another style of bracket to mount the canister to the battery hold down bolt.

The plastic canister will work on the front tank however you will need the appropriate strap to mount it and only IF you have the early gas tank. Later gas tanks and some of the repos do not have the provisions to mount the canister to them.

An early canister mounting strap should be pretty easy to come by as there were a TON of them produced, I think I have a few spares myself. Please dont trash that 74 strap though as they seem to be the hardest to come by, at least it was when I had to find one for my Bumblebee.

yes, are you listening partwerks.
don't trash the strap.
the reason they are a little hard to find is thats the shortest run of cans in that particular position. the best position. (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/beerchug.gif)

its fascinating the way they kept moving that can closer and closer to the fan bleed port?
what was happening there. first the frunk.

i dug up some stuff recently that makes me think the EPA was taking a real close look at VW in mid 73. they got charged with the first emission cheat. it got hushed up at the time and settled real quick behind the scenes. but one particular VW model for 74 got delayed. can't find out which one. but i've got a fair idea. there is a fair chance the EPA started taking a real close look at VW model range for 74. all aspects thereof?
there is always a reason they suddenly change something they have been doing for 3-4 years and then start fidgeting with it.

[JamesM]

yes. thats pretty interesting stuff JamesM.

if you re-find that vin number change over please post it up.
i had a bit of a search but i couldn't get it to come up.
i know they were having a bit of a go at nailing it down for the last edition of the restorer's guide. but i couldn't find out if they succeeded. i don't have a latest ed of that, just my old and by now very obsolete edition 1.

as to the plumbing of the can in the engine bay - there is another argument. (IMG:style_emoticons/default/smile.gif)

http://www.914world.com/bbs2/index.php?showtopic=346667

Doesn't have the exact VIN but looks like we have it nailed down as 2/74 sometime prior to the LE cars as when the production change over for the 2.0s occurred. George seems to agree that all the 74 1.8s had the rear canister.

The newer version of the PET online shows a VIN for the cutover but its a 73 VIN (4732924903) which we know that isnt correct, this may have been the VIN number I recall seeing.
https://www.porsche.com/all/media/pdf/origi...914_KATALOG.pdf


What @partwerks really should be looking at is what hoses are on his chassis as properly utilizing a front mounted charcoal canister is going to suck if his chassis isnt already cut for the larger vacuum hoses used on the earlier cars.

[wonkipop]

yes. thats pretty interesting stuff JamesM.

if you re-find that vin number change over please post it up.
i had a bit of a search but i couldn't get it to come up.
i know they were having a bit of a go at nailing it down for the last edition of the restorer's guide. but i couldn't find out if they succeeded. i don't have a latest ed of that, just my old and by now very obsolete edition 1.

as to the plumbing of the can in the engine bay - there is another argument. (IMG:style_emoticons/default/smile.gif)

http://www.914world.com/bbs2/index.php?showtopic=346667

Doesn't have the exact VIN but looks like we have it nailed down as 2/74 sometime prior to the LE cars as when the production change over for the 2.0s occurred. George seems to agree that all the 74 1.8s had the rear canister.

The newer version of the PET online shows a VIN for the cutover but its a 73 VIN (4732924903) which we know that isnt correct, this may have been the VIN number I recall seeing.
https://www.porsche.com/all/media/pdf/origi...914_KATALOG.pdf


What @partwerks really should be looking at is what hoses are on his chassis as properly utilizing a front mounted charcoal canister is going to suck if his chassis isnt already cut for the larger vacuum hoses used on the earlier cars.

ah no.
its way earlier than that.

we have 74 1.8s that are in nov 73, two weeks apart.
one had the frunk can.
one has the engine bay can.
and the engine bay can is 100% verifiable.
belongs to StarBear, he has had it since brand spanking new.
and the frunk can has almost similar status.

i have late jan car.
i'm the second owner since 89 and i bought a 35K one owner car back then.
unmolested.
i have never fu$ked with anything. engine bay can.

and we have a few more nov and dec cars.

dr 914 is close to right. but not 100%. there is at least one exception.
dr 914 was also close to right about another thing to do with distributor hook ups.
but again not 100%.
its more complicated. (thanks to a curved ball from mr. bowlsby we are still trying to get 100% to the bottom of).

its got something to do with the start up of making the 1.8 cars.
which i am pretty sure happens in nov 73.

i have always been interested in the 1.8s because i have one.
and the whole thing about L jet.
but only lately been a little more curious about it.

i'm not sure anyone has properly gotten to the bottom of what was happening in the second half of 1973 yet.

its got nothing to do with LEs.
or 2.0 litre cars.
its to do with the everyman base cars that no one really has ever been that much interested in. which i just can't really understand.
L jet is the birth of modern fuel injection. but ............. (IMG:style_emoticons/default/confused24.gif)

[JamesM]

its fascinating the way they kept moving that can closer and closer to the fan bleed port?
what was happening there. first the frunk.

i dug up some stuff recently that makes me think the EPA was taking a real close look at VW in mid 73. they got charged with the first emission cheat. it got hushed up at the time and settled real quick behind the scenes. but one particular VW model for 74 got delayed. can't find out which one. but i've got a fair idea. there is a fair chance the EPA started taking a real close look at VW model range for 74. all aspects thereof?
there is always a reason they suddenly change something they have been doing for 3-4 years and then start fidgeting with it.

My guess is it also may have been related to the production cost cutting that started occurring with the 74 cars as well. Moving the charcoal canister back to the engine bay reduced the materials used (and complexity) to run the 2 larger vacuum lines from the engine bay to the frunk along the driver side long. Coincidently (or possibly not) the changeover seems to align pretty close to when they transitioned from the glass faced gauges to the cheaper plastic face gauges.

More interesting stuff, the early strap was a 914 specific part number while the 74 strap was a repurposed VW part number. While you would think that would make it easier to source, in the VW application it was welded to the chassis (found this out the hard way in my attempts to source one). Guessing it was a quick fix for 74 using what they could easily get their hands on while they developed the 75 part.