Petrol in the engine case.

[uniqueinteriors]

Vw heritage do a fuel pump to fit you just have to rotate the top so it fits

[Rosie n' Jim]

There are electric pumps from Facet that give different fuel pressures. Mine is the 2.5 lbs version, works well with no issues.

[uniqueinteriors]

Another thing I've noticed is that the fuel pressure gauge is reading zero.
also if the float bowl was over filling wouldn't petrol be coming out of the pipe that comes out of the fuel bowl. Currently it doesn't 

[Rosie n' Jim]

The gauge would give a reading of the fuel pressure when pushing against a closed valve. If the valve didn't close pressure wouldn't build up.
The lowest exit from the fuel bowl would be the output in the center of the venturi. It might also seep out via an air jet.
I think I'd try clamping the feeds to both cars to see if you get a pressure reading. If you do, release one clamp to see if it drops, if not, try the other. That would at least identify which car is the problem. 

[uniqueinteriors]

Great idea Rosie and Jim!

[simonmarsh]

At the risk of confirming my stupidity / ignorance, I had this issue as our drive slopes quite steeply and I made the mistake of parking with the rear of the van (and therefore engine) lower than the petrol tank. I've since started parking it elsewhere and also had a shut off valve fitted in the petrol line so petrol only flows from the tank when the ignition is on. Probably unrelated to your question but is there a small chance could be similar?

[davidoft1]

Another thing I've noticed is that the fuel pressure gauge is reading zero.
also if the float bowl was over filling wouldn't petrol be coming out of the pipe that comes out of the fuel bowl. Currently it doesn't 

I
Would say your gauge is faulty and suspect the fuel pressure to be incorrect too, there’s no overflow on those carbs , it will run directly into the inlet manifolds and fill the cylinders then leak down into the sump , get a known good gauge and regulator or the correct pump

[uniqueinteriors]

So I have just spent a couple of hours playing with fuel system. I found a small fuel leak which I have remedied. I've taken my regulator apart and all is spot on with that. The engine now runs but the fuel pressure is only 1psi which I would assume is not enough!. So I'm now thinking my cheap £14 amazon fuel pump is faulty or just not up to the job. Thoughts please everyone I think we're getting close!

[Rosie n' Jim]

It will run on 1psi, and probably cruise gently, but will struggle under load. Also, if the float valves are good, it will not push past them, which is what seems to be your problem.
​​​​​​The problem Simon mash refers to is a little different.  The float chamber is forward of the venturi. It's a very simple way to enrich the fuel flow when going uphill, bdcause the fuel is higher, and leaning it off downhill, fuel level being lower. I try to avoid parking nose up as it tends to be too rich when starting a warm engine. No problem on cold mornings though!
 

[davidoft1]

So I have just spent a couple of hours playing with fuel system. I found a small fuel leak which I have remedied. I've taken my regulator apart and all is spot on with that. The engine now runs but the fuel pressure is only 1psi which I would assume is not enough!. So I'm now thinking my cheap £14 amazon fuel pump is faulty or just not up to the job. Thoughts please everyone I think we're getting close!

What have you used to calibrate your fuel
Pressure regulator and gauge ?

[Rosie n' Jim]

Keep it simple, buy and fit one of these to replace your pump and filter king.
https://www.mcgillmotorsport.com/facet- ... -17-p-5875
Beware copies though, buy from UK specialist company, not eBay.  This is from personal experience.