Review on 🚗 Automotive-leader 6mm 1/4" Rubber Fuel Transfer Vacuum Hand Primer Pump Bulb – Black, Marine Boat Accessory for All Fuels by Justin Spoja

I bought two of these and both were smaller than advertised but with a tight clamp I was able to get them to work with my 1/4" fuel lines When I took over my boats, "choked" them under heavy loads. Basically they didn't let enough fuel through, probably because they were smaller than advertised. I checked their operation by taking them off as they didn't seem to help prime my units and upon checking them I found that one barely worked to move the fuel in the right direction and the other literally worked against the specified flow.