fuel pump draining back to tank

Bought the thin one because I have a height issue. This includes the base plate and spacer and 3 gaskets. All in all it only goes up about 1/2", but I see a noticeable difference. Don't know about the blend, but this summer in Pennsylvania the gas sucks for old school cars, and I still blame the enathol!

My question was "better fuel pump recomandations?"