Um... Expansion Tank?

[350SL4spd]

See anything wrong in the is picture?



Where'd my expansion tank go? I pulled my fuel tank to change the tank filter & found no expansion tank there at all. Any chance that the early R107's didn't have one?

Any potential trouble from a lack of expansion tank? Any dangers? Do I need to get one?

[meltedpanda]

its gone , and yes you should have one

[350SL4spd]

Of all the damned things to disappear...

I don't suppose anyone has a nice used one they want to sell?

[DieselPaul]

The lines being plugged back into themselves tells me yours is missing.

And yeah, you should get one, I guess if the car doesn't reek or hasn't exploded yet, it's not a huge deal, but yeah find one on a forum, I checked ebay when I was looking for a fuel tank and some guy wanted like $300 for one.

[rowdie]

There is a '72 SL being parted out on BW.
http://www.benzworld.org/forums/r-c107-sl-slc-class/1580973-1972-350sl-part-out.html

[Graham]

Originally Posted by 350SL4spd

See anything wrong in the is picture?



Where'd my expansion tank go? I pulled my fuel tank to change the tank filter & found no expansion tank there at all. Any chance that the early R107's didn't have one?

Any potential trouble from a lack of expansion tank? Any dangers? Do I need to get one?

If that is an early Euro model, I suppose there is a chance that they didn't have them back then? Where does the vent go? Looks like it goes through trunk floor to under car? Does it then connect to anything?

I looked on Russian parts site - the fuel tank design has been changed many times.

I have an old parts book. On page 47/2, it shows a tank with no expansion tank. The vent goes straight from the top of tank to a canister in the engine bay, via an under car valve. On Page 47/4 it has a similar diagram, but with an expansion tank. But the early cars don't have those canisters, do they?

Then, on Page 47.1 11-700/5 of engine manual it again shows a tank without an expansion tank. It says later that models 107.02 and 116 have an expansion tank integrated into the actual tank. But then this isn't a 107.02 is it. But maybe someone changed the tank?

On page 706/1 it says that for the 107.043, starting Sept 1971 chassis 0003443, an expansion tank with 5 connections was fitted. Prior to that the expansion tank had 3 connections. This seems to say that even early cars did have an expansion tank, but one with 3 connections.

So depending on chassis number, you may need either a 3 or 5 connector expansion tank.

One more little mystery....

[rowdie]

I looked on the EPC and got a head ache trying to figure it out. I am not sure it ever had one.There should be two holes in the panel behind and above the tank where it would have been mounted.
My 107.044 #2913 built 2/72 had one with the 5 connections.

[Stretch]

Just so you know my Euro 300D doesn't have an expansion tank.

My fuel vent comes out just in front of the left hand rear wheel - it might be the same on your car.

[350SL4spd]

Originally Posted by Graham

If that is an early Euro model, I suppose there is a chance that they didn't have them back then? Where does the vent go? Looks like it goes through trunk floor to under car? Does it then connect to anything?

I looked on Russian parts site - the fuel tank design has been changed many times.

I have an old parts book. On page 47/2, it shows a tank with no expansion tank. The vent goes straight from the top of tank to a canister in the engine bay, via an under car valve. On Page 47/4 it has a similar diagram, but with an expansion tank. But the early cars don't have those canisters, do they?

Then, on Page 47.1 11-700/5 of engine manual it again shows a tank without an expansion tank. It says later that models 107.02 and 116 have an expansion tank integrated into the actual tank. But then this isn't a 107.02 is it. But maybe someone changed the tank?

On page 706/1 it says that for the 107.043, starting Sept 1971 chassis 0003443, an expansion tank with 5 connections was fitted. Prior to that the expansion tank had 3 connections. This seems to say that even early cars did have an expansion tank, but one with 3 connections.

So depending on chassis number, you may need either a 3 or 5 connector expansion tank.

One more little mystery....

Man, I run into this s@%t all the time on this car. My fuel pump/filter set-up is a pre-1st generation set-up for the R107. I played hell getting the pieces that would work...

My chassis is 107.043 #4542, so after the number that you mentioned, but it lists the build date as Dec 71 (not that probably correlates to a .043...). The tank has all the connections for the expansion tank: the 2 on the left are connected to each other in a loop, the one furthest to the right vents to behind the filler door & the one right next to it is capped off w/ a bolt in the hose. The one in the middle goes under the car to a line that runs to the charcoal canister under the hood. That last one was completely bodged & I think it was originally the one that just vented open under the car: for one: the hose was rubber 1/2 way & then hardware store steel line the rest of the way to the front of the car and 2: the line that goes under the car has one of those plastic nipples that MB only puts on drains & not on connections.

I can say that all the hoses/connectors on the tank are correct period MB bits & everywhere else on the car where things have been messed with it's rubber lines & 1/4" US hose clamps...

[DieselPaul]

Originally Posted by Army

Just so you know my Euro 300D doesn't have an expansion tank.

My fuel vent comes out just in front of the left hand rear wheel - it might be the same on your car.

AFAIK Euro and US 300Ds don't have expansion tanks, the 3 I had didn't have expansion tanks.

[meltedpanda]

I think I have one off an 83 380 wonder if it would work?
I need to get over to the field its in if you think it will, let me know

[nobby]

Maybe your car never had one BUT had the tank replaced with a newer model?


this is what it should look like.

[rowdie]

What happened to the one over on BW?
AFAIK you should not have a charcoal canister. Never seen one on an early 107.

[350SL4spd]

Originally Posted by rowdie

What happened to the one over on BW?
AFAIK you should not have a charcoal canister. Never seen one on an early 107.

Got it in the mail yesterday. I'm sure the charcoal canister was added on mine when it was federalized. Trying to figure out now how to elegantly delete it.

[rowdie]

OOops. You said elegantly.