BSA B33 1955 Fuel Pipe/Tap configuration

SimonJH · 02 June, 2025, 20:30:34

Hi,
I'm a novice on my first project so this may be a dumb question but I'm struggling!

I'm rebuilding a B33 1955 Swinging Arm from boxes of bits. I'm at petrol tank stage.

The tank I have, which I'm sure is original (4 gallon), has 2 fuel outlets, one on each side of the tank (see picture). But the original parts manual, and draganfly etc all show this model/year with a single tap/pipe outlet. Everything else about the tank looks right apart from the 2 outlets. So my problem is what is the best way to configure this? Do I have 2 pipes/taps with 1 as the main a 1 reserve, or some sort of 'balance pipe between them, but then how do I fit the tap?

Any ideas would be appreciated.

I know it looks a mess underneath - previous owner had 2 plates with very bad welding so the chap who sprayed it has to seal it, and I know it should be chrome, but could only afford to get it sprayed silver for now.

Many thanks
Simon

Derek996 · 03 June, 2025, 11:26:06

Assuming the bike has a Monobloc carb, fit a double banjo to it with one tap connected to each leg.

DAVE BRADY · 03 June, 2025, 14:58:24

Hi,

As said re double banjo.
If you look at the base of the tank you will see that what is the lefthand side has a lower base and so carries a bit more fuel to act as a reserve.

Dave.

V500 · 03 June, 2025, 15:48:09

Or one pipe from each tap into a T piece, then a single pipe going to the carb via an in-line filter.

SimonJH · 03 June, 2025, 17:45:41

Quote from: Derek996 on 03 June, 2025, 11:26:06Assuming the bike has a Monobloc carb, fit a double banjo to it with one tap connected to each leg.

Thanks. It is a monoblock so that sounds perfect.
Thanks for quick response

SimonJH · 03 June, 2025, 17:46:38

Quote from: DAVE BRADY on 03 June, 2025, 14:58:24Hi,

As said re double banjo.
If you look at the base of the tank you will see that what is the lefthand side has a lower base and so carries a bit more fuel to act as a reserve.

Dave.

Thanks Dave - I did notice that the left had has a lower base - so that explains it !
Thanks for quick response.

SimonJH · 03 June, 2025, 17:48:22

Quote from: V500 on 03 June, 2025, 15:48:09Or one pipe from each tap into a T piece, then a single pipe going to the carb via an in-line filter.

Thanks - I'll try the double banjo option but If I can't get one this will be as good I think.

Many thanks for quick response

V500 · 03 June, 2025, 21:23:17

T pieces are cheaper than Amal banjo's, and you can use a single filter.