I needed a reliable low pressure pump for a vintage car. The new alcohol additive in gasoline is causing many vapor lock problems in older, carburated cars. I run a restoration shop and have used Carter products for a long time now. Having tried all the other brands, Carter is my pump of choice. This pump is exceptionally quiet, as well as having very stable pressure. Many pumps will vary pressure widely with temperature changes. This one doesn't seem to do that. If you need a 4lb pressure fuel pump, buy this one from AutoPartsWAY. I couldn't beat the price from any of my other suppliers. Avoid the cheaper pumps, you won't be happy with them. This one will run well for a long time.