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I use a fuel filter on the intake side.https://www.ebay.co.uk/itm/2-x-Motorbike-Petrol-In-Line-Fuel-Filter-Dirt-Bike-Generator-Fits-6-or-8mm-Pipe/332429732507?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
I used this pump, as it has a suction of 1M, so eliminating the pump dry running when started up. No non return valve required.https://www.aliexpress.com/item/AIYIMA-Mini-Water-Pump-DC12V-Pumps-For-Medical-Equipment-Water-Purifiers-Fish-Tanks-Pumpping/32829009198.html?spm=2114.search0104.3.1.1fa84629YcvcCN&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10151_10065_10344_10068_10130_10324_10342_10547_10325_10343_10340_10548_10341_10696_10192_10190_10084_10083_10618_10307_10301_10303_5711211_10313_10059_10184_10534_100031_10103_10624_10623_443_10622_10621_10620,searchweb201603_41,ppcSwitch_7&algo_expid=c9e88dd0-35dc-4e05-8d0f-6f74fe1644a5-3&algo_pvid=c9e88dd0-35dc-4e05-8d0f-6f74fe1644a5&priceBeautifyAB=0