Holley Black died over the weekend. It was probably three years and 400 plus hours old. I may just replace it with same but any other recommendations for this type of pump?

I have no anti siphon valve, is there some sort of check valve that an electric pump will tolerate on the suck side? Something easy for it to overcome while pulling fuel? The supplied USCG approved anti siphon is very hard to pull off and is a restriction. All I need is a valve to prevent fuel from back-flowing into the tank when the electric fuel pump turns off. I have it mounted about mid tank height but cannot get it any lower than that for clearance reasons.

Would anything on these pages work?
http://www.mcmaster.com/#catalog/115/471/=34mxrv
see last one in above link
http://www.mcmaster.com/#catalog/115/476/=34mw5m
http://www.mcmaster.com/#catalog/115/475/=34mwyf

Anyone care to explain the Cv factor? I think higher is better for a given pipe size. Would a cracking pressure of .22 piss off the Holley Black fuel pump?
See Type 316 Stainless Steel Swing Check Valves on this link;
http://www.mcmaster.com/#catalog/115/475/=34n54a
in either a 3/8 or half inch. I could use the half and use an adapter on end to get things to line up.

It seems many of have removed the check valves for various reasons. Let's see if we can pick through these pages and come up with a product that although not USCG approved would be better than nothing yet allow us the goal of why it was removed in the first place.
Things to consider;
Cracking Pressure
Cv
material
fluid compatability
cost
installation orientation

Two heads are better than one.

no ones fuel pump likes to have a check valve in front or suction side. we are a S-X dealer and we put them on the discharge side. we also make a soft seat size #10 an check for this . we have them on air boats and power boats all over the US with out any drain back problems.