type of bolts used on a Mk2 fuel sender

[Lynn Eades]

If I have read the parts book book correctly (1941 MkI*book), they should be 2BA.
Although the MkII* is later, I think they would have stuck with the same threads. I don't actually know.
The following might help?
2BA is not the same as 10-32 but it is sort of close.
2BA is about 0.182 dia. (these are actual measurements on screws, not from a reference book)
10-32 is about 0.189 dia.
Over about 4 threads one will NEARLY lay into the other
Reality is they don't fit and I can imagine that what probably happens is that they go tight in the thread before the head takes up any real clamping load.(this will depend on how good a condition the thread is in)
If you can't locate the 2BA screws then maybe tapping to 10-32 is an answer.
Keep in mind that the screws go into a blind hole in most tanks, so a plug (bottom) tap is in order.
The holes are blind because the mounting ring is welded to the top of the tank after the ring is made.

[brengunman]

My Illustrated Parts Catalogue, FUC-03, Carrier Universal MkI* and MkII* 1941-4 by Ford Canada page 199 and illustration no. 38 shows under Gauge - tank unit:

P/N 27068 S2, Screw - #10-32 x 5/8" round head, quantity 6 on the Welsh Guard Models only.

It also has an obscure note under the heading "Interchangeable Proprietary or M.T. Part Number" NA/AN44222.

George

[Lynn Eades]

And on page 204 it says it again for the fuel sender screws,10-32, but then it also says for the "Cap and tube outlet", Screw # 2BA x 3/8 round head qty 4.

Isn't that Irish, to have two different, but visibly indistinguishable standards melded together in one fuel tank.

How stupid of me to think they would be the same!

[Stew Robertson]

It must of been engineered by two different engineers

[Stew Robertson]

no matter what size, the 10 /32 will work, as by the time the thread is cleaned with a 10/32 tap the screw will have enough pull to hold and seal
But that is just my opinion /millwright for the last 50yrars/Fixer of engineers mistakes

[rob love]

Originally Posted by Stew Robertson

It must of been engineered by two different engineers

Agreed: the filler neck is original British, so would be British threads. The sending unit flange is a Cdn design, so would be North American threads. Makes perfect sense.

[Bob Carriere]

We have used 10/32 on many tanks with good sealing and no thread issues.

[Richard Farrant]

As the British design only used dipsticks in petrol tanks, the addition of the sender units in the Canadian design, would obviously use hardware and tooling that they had to hand in their country. As much as possible was kept interchangeable.
I have come across differences in the axle pinion shafts though, the threaded hole in the end of the pinion shaft, I have found with both NF and NC threads, anyone come across that?