Fuel pressure dropping while driving and under acceleration to zero at idle runs 4 lb electric Blue

I looked for details on the Mallory 250 and came up with an instruction sheet. It does not say if it will pull fuel, but it doesn’t say it won’t either.
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I’m sure someone somewhere has done some testing on it but a quick google search didn’t turn up what I was looking for. @Rat Bastid i know you’ve used those, have you done any testing on them to see if they’ll pull fuel?