fuel draining back into tank

my fuel is draining back into the tank after she sits for a few hours or overnight so in the morning i got to re prime the fuel system by cranking her its annoying i am thinking an purchasing the mr gasket micro electronic fuel pumps they are 40 buck in stead of the 150 200 pumps i see available and they are available at the local parts store
has any one used these pumps or should i go with the oem replacement fuel pump im currently using one for a 360 on my 318 i don't have any fuel starvation issues with this pump i just think its the cause of the drain back to the tank:think:
any input would be appreciated :)

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File Type: jpg mrg-12s_w.jpg (11.0 KB)
Author: Gorts 5th