Installing a 1974 Tii Gas Tank in a 1976

[Mike Nance]

Thanks @bergie33

[John76]

@JohnS Thank you for the reminder of the "jumpy fuel gauge" syndrome when the right turn signal is used.

The fuel sender ground is bunched with the right rear taillight, and despite careful cleaning, still made the fuel gauge jump in rhythm with the turn signal flasher. The extra ground wire (green in my picture) solved this issue completely.

John

 

[tech71]

4 hours ago, Mike Nance said:

Do you know if there are any reproduction ‘74 takes available?

MVP

Manufacturer of Vintage Car Parts,MVP,BMW2002,BMW,bmwclassiccars,bmwclassic,bmw2002classic,bmw02club,mvpvintageparts,recreate a legacy

WWW.MVPVINTAGEPARTS.COM

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Manufacturer of Vintage Car Parts,MVP,BMW2002,BMW,bmwclassiccars,bmwclassic,bmw2002classic,bmw02club,mvpvintageparts,recreate a legacy

 

[Conserv]

10 hours ago, bergie33 said:

Walloth Nesch has them.  So does Blunt.

Talk with Blunttech. If there is a problem, it’s probably easier to handle it within the U.S. rather than with overseas shipping. Here’s what happened with my Walloth und Nesch tank, which arrived with a defect.

 

First, the complicated ground of U.S. tii fuel tanks. From an earlier thread of mine, a summary of the tii tanks:

 

“Type I. VIN’s 2760001 through 2761963 (most 1972 models): tank (46 liters) = 16111107596; pickup (twist-in) = 16121107413; pickup seal = 16121105332; fuel sender = 62161354267; fuel sender seal = 62168782015

 

Type II. VIN’s 2761964 through 2764369 (some 1972 and all 1973 models): tank (46 liters) = 16111110614; pickup (screw-down) = 16121110621; pickup seal = 16121110598; fuel sender = 62161354267; fuel sender seal = 62168782015

 

Type III. VIN’s 2780001 through 2782927 (all 1974 models): tank (51 liters) = 16111111604; pickup (screw-down) = 16121111607; pickup seal = 16121110598; fuel sender = 62161358096; fuel sender seal = 62168782015

 

Type I. is used on 1972 models through VIN 2761963, which was built in early June 1972, just twenty cars after the initial switch to E12 heads and aluminum intake runners. Thus, a majority of 1972 tii’s have Type I tanks, with their twist-in fuel pickup. Later 1972 models, VIN’s 2761964 through 2762629, and all 1973 models received Type II tanks, with screw-down fuel pickups. Lastly, all 1974 tii’s, VIN’s 2780001 through 2782927, received Type III tanks, with screw-down fuel pickups and a cropped right rear corner, but having an additional 5 liters of fuel capacity (51 liters versus 46).”

 

No one seems to have the correct Type II tank I needed for my ‘73 so I bought the Walloth und Nesch tank they sell for 1974 U.S.-spec tii’s, among other possible models. It’s 51 liters, like original square taillight tanks and has a cropped right rear corner, so it fits with a U.S. square taillight — or most anything, since a square taillight tank is the “universal donor”.

 

But, the filler neck on my example was attached wrong: it was clocked about 15 degrees too far clockwise. Thus, you couldn’t, even with the late rubber filler neck, get the filler neck to align with the filler aperture in the right rear quarter panel. The tank went back. I never got an explanation whether my tank was a one-off boo-boo or whether they were making all that model tank with the badly-aligned filler neck. 
 

I found a new tank without the cropped corner — more round taillight in style — but it’s 51 liters, so my round taillight pickup and sender are too shallow in it.

 

Finally, here are photos of the Walloth und Nesch tank with the bad filler neck.

 

Tii fuel tanks: sheesh! 🙄

 

Regards,

 

Steve

 

 

 

[Conserv]

7 hours ago, tech71 said:

MVP

Manufacturer of Vintage Car Parts,MVP,BMW2002,BMW,bmwclassiccars,bmwclassic,bmw2002classic,bmw02club,mvpvintageparts,recreate a legacy

WWW.MVPVINTAGEPARTS.COM

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Manufacturer of Vintage Car Parts,MVP,BMW2002,BMW,bmwclassiccars,bmwclassic,bmw2002classic,bmw02club,mvpvintageparts,recreate a legacy

 

I found an MVP tank, on eBay, that is currently in my ‘73. It’s 51 liters, like a square taillight tank, but has no cropped right rear corner. So it wouldn’t fit a U.S. square taillight tii (1974), but it’s too deep to work correctly with my ‘73’s pickup and sender.  Four years in, I’m still looking for a correct 1973 tii tank (46 liters, screw-down pickup).

 

The trend I’m seeing is that the replacement fuel tanks are all becoming 51 liters. I suppose “why not”, assuming you’re replacing your 46-liter pickup and sender with 51-liter units. 
 

Best regards,

 

Steve

 

 

[Stevenc22]

Here is the tank you want

 

Fuel tank 51 Ltrs. with European ECE homologation for 2002 tii ( only for bolted-on suction/discharge unit, not for Touring models, not for 1974-1976 US spec. models) you need 1 for 1 car

WWW.WALLOTHNESCH.COM

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Fuel tank 51 Ltrs. with European ECE homologation for 2002 tii ( only for bolted-on suction/discharge unit, not for Touring models, not for 1974-1976 US spec. models) you need 1 for 1 car

 

Edited April 6 by Stevenc22

[bergie33]

2 hours ago, Conserv said:

 

But, the filler neck on my example was attached wrong: it was clocked about 15 degrees too far clockwise. Thus, you couldn’t, even with the late rubber filler neck, get the filler neck to align with the filler aperture in the right rear quarter panel. The tank went back. I never got an explanation whether my tank was a one-off boo-boo or whether they were making all that model tank with the badly-aligned filler neck. 

 

 

Steve, your issue was not a one-off boo-boo.  I had the same issue, documented here (starts about half way down the page):

https://www.bmw2002faq.com/forums/topic/306036-gas-tank-toast/page/2/

 

I kept it because of the great price, ease of the fix, and W&N willing to cover the cost to fix it.