MG
The Classic Marque

Mechanical, Guy. Just like the old original, except that it doesn't have the useful manual lever (though fuel doesn't flow back through the pump, so I haven't missed it yet).

The overflowing on the way back from Northumberland was with the old pump, in fact the whole fuelling setup we'd had for twenty years.

What fuel pump are you using, Nick?

Yes, done most of that.
When we got home, I dismantled the entire fuelling setup: new pump, new filter, new soft pipes, carbs cleaned up and all linkages taken apart. But I broke one of the little pedestals in the rear float chamber lid, that the spindle goes through.
Ebay found me a lid, in good nick, and I put it in. I had a spare needle and jet, so I've been trying the combinations. Tho...

Your perseverance is an inspiration to us all! Good luck on the endeavor.
Ed

I recently went to move my B and noticed a strong smell of petrol, having moved the car there was a trail of petrol. A quick look revealed it was coming from the flexy pipe on the outlet of the pump. Today I took the flexy pipe off and dissembled it, it was one of the braided type. Having removed the outer metal braid it showed a cotton braided pipe marked Cohline 2122. I removed the cotton braid ...

1. Intermittent failure suggests crud in the fuel line.

Blow out the fuel line between pump and carbs - both ways

Might also be worth removing the jets and the pipes on the float bowls, check nothing is obstructing in there.


2. Float appears not to be leaking, but . . .

But what ?

3. Lever is carefully set to 7/16" from lip of chamber to apex of curve.

The fuel level in the float defines the fuel level in the carb, so if you change the float level, it will change the height you set the jet to, but provided you have adjusted the mixture after messing with the float- that IMO is non issue.

Have you had the top off the float chamber and checked for the white crud that builds up in the bottom ?

As it's the rear float chamber - I am...

In June I reported that we had to be recovered from North Yorkshire because of a fuel leak. It was entirely down to the rear float chamber overflowing, and the fuel had somehow found its way into the passenger footwell.

Since then, I have a new pump and all new flexible plumbing, and have sent for new jet and needle.
These were no use, being too big to allow the float lever to be fitt...

Anam 🤣. Although you want something that goes round corners..... (apologies to Dave and others).

Get an MGB. 😉.