Help identify those fuel level Senders? 2002 Tii?

[Toga]

Hi gentlemen,

I'm in the process of reassembling my 74 Tii after a "serious" restoration to bare metal. And unexpectedly I find 2 different fuel senders in a box! Could you help me identify which is what? My fuel tank is supposed standard for the year 74 and should be a 51 liters.The short sender has those numbers:817-004 001 and a 12.1 and fits in. So that's the one.
The long one has 81714112  21/314 217/318 VDO 2.83...and is too long to fit. would that be for a Touirng fuel tank?

 

Thanks for your help, take care.

JP

Edited May 10, 2020 by Toga

[jgerock]

The short one is similar to what I have in my 69 2002.  I tried installing a newer one and it was too long.  46 to 51 liter capacity change I believe.

[dlacey]

The long one has a mesh filter on the bottom, thats a fuel pickup...from a carb car...theres a metal tube coming out the top of the sender.

The tii sender has no pickup tube, just 3 electrical connectors on-top (Fuel level, reserve, earth)

Edited May 10, 2020 by dlacey

[Toga]

dlacey both have a fuel pickup on top...but one was closed with a ruber tube and a screw! Now I understand that I never had an original Tii part on that tank! Car was running though. So I'll keep that solution until I find a better solution. Thanks to both of you for your help!

[Swiss 2002Tii]

Hi Toga,

 

My '72 Tii's fuel sending unit was a real mess and leaking fumes like a sieve.  You can see that it has the fuel line pinched off.

Old unit with low fuel contact (BR-SW, left)

BR-YEL is signal wire to gauge

The gasket underneath was totally disintegrated.

So I ordered what appeared to be the correct sending unit from BTS in Germany.  It has only two sensor terminals, no fuel line.  The third connector would be for the low fuel indicator that shares the light with the emergency brake in the instrument cluster.  

 

Unfortunately, it was shorter, as one of your is.  My fuel tank must be deeper than yours (BTS said mine was the 51 liter tank, "wrong for my '72 version Tii).  51 liters sounds right based on my fill-ups.

 

Anyway, BTS wouldn't take it back, as Customs and duties between Switzerland and Eu are complicated.  I found a nice FAQ member in search of that unit, so we both ended up happy.

 

I ended up cleaning all of that RTV mess off of mine, sealing the fuel tube with POR-15, and replacing the rubber gasket underneath to solve (well, reduce) my fuel smell in the trunk.

 

Since I measured the resistance of the wires on the respective units, I include them here:

Long unit:

 

Short unit:

 

Full reading (same on both):

 

Hope that helps.

 

 

[Hans]

Perhaps NK sender?

[Toga]

Swiss 2002Tii thanks for all those references.This gave me the idea to measure mines today, and here are the figures I found : long version 3.8ohms full and 77.0 empty; the short version (the one that fits to my tanks) 68.3 empty and 4.1 full.
The values being very close to each other this make me thing the long one is also for a 51ltr tank but deeper.
By the way you car looks in great shape on the pics!
attached some pics of my confinement occupation

[Henning]

Please give us the lengths, Toga. I remember some values but not sure enough to post.

There are six sender units: 2002 and tii -73, 2002 and tii -76 and the tourings and touring tiis. The turbos have -iirc- the touring senders. Corrections welcome!

hen

 

[Swiss 2002Tii]

22 hours ago, Toga said:

attached some pics of my confinement occupation

Great color!  Yep, I'm finding more time for long-awaited projects these days!?

[Toga]

Hi Henning, tks for your post. The long one is 23cm total. I don't have access to the short one tonight. I'll post that Saturday. But it should be around 19cm.

JP

[Toga]

Back to you Henning. The short one which fits on my tanks is 21cm total length. The long one as written above is 23cm.