bought this to fix fuel drain back problem

not a fuel drain back problem..it is lousy gas that evaporates ...and a lousy eddy/carter design carb...that has the accelerator pump well higher then the bottom of the fuel bowl...

my holley 2300 2 barrel which is half of a 4 barrel...the motorhome has not run since april 20, ...fired right up with a pump of the gas....holley has acelerator pump inlet on bottom of bowl...my eddy 1406 on my duster....two days and no pump action....