Fuel Lab. Newish pumps on the market, they are in line but the manual with mine says they can be mounted in tank. Apparently they run lower current. Can't vouch for them yet as I only got mine today and don't have an engine to test it with. This is their 255lph one, although I think they are also flow more then they say according to a few reviews I read.
http://fuelab.com/prodigy-fuel-pumps...line-fuel-pump