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Are you clamping the exit line also, as it's not uncommon to find that the leak is from your catch pot set-up?
You should be performing a 'drop-test' prior to infusing your parts - clamp the exit line and leave for 20-30 minutes before unclamping the line (ensuring that you've used the pump to evacuate air from the catch pot side first). If the vacuum level doesn't change, then you're good to go. If it does, then you'll need to go around the perimeter of your part and exert some pressure on the taped edges, especially around the pleats, to try and eradicate the leak source. Then perform another drop test to see if this has worked.
If you're not using a catch pot with integral gauge, then if you switch on your pump before unclamping at the end of the drop test you'll hear crackling from the pump as it evacuates air from the bag if the loss of vacuum isn't visibly noticeable
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