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For anyone else with a similar problem a simple test is to pull the fuel line off the top of the fuel filter. Attach a pipe to the top of the fuel filter and run it into a container. Turn the key enough to hear the fuel pump start and measure the amount that ends up in the container after 1 minute.
Mine had pumped a mere 200ml at most in 1 minute. From what I can find online it should be closer to 900ml - 1 litre in 60 seconds.
Based on this it seemed the fuel pump was the likely cause since I had replaced the fuel filter and left the fuel tank Cap off when testing to ensure there wasn't an issue with negative pressure etc.
If you get enough volume into the container I would then be looking at the fuel return solinoid, carby inline fuel mesh filter (banjo bolt) or the carby itself as these bits are all after the fuel filter which is where the above test tests up to.as such.
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