Facet Pumps in series.... If you are buying these pumps from another source, say a racing shop or something, you have to watch the model you buy. Facet implements 2 feature options that will prevent them from being used in series. Most of their pumps have check valves in them that ensures fuel moves only one direction. That's not a problem for us generally. The other feature is the positive shut off integral to some models. In these models, if the pump is off you can not push or pull fuel through them....I will point you to their web site for a matrix....the PSO column indicates the presence of the Positive Shut Off...
http://www.facet-purolator.com/cube-fuel-pumps.php Phill Hill Collinsville, IL
