My internal Walbro is kinda noisy and occasionally gets noisier (seems to be when it gets hot). I can only imagine an external one will be noisier, and I've also noticed that stripping the interior makes a huge difference to noise levels - have you got any missing carpet/trim/seats?
Without being able to hear how much noise there is it's hard to make a judgement, but it may not be anything to worry about.![]()
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