Is there such thing as a high flow spring and ball checkvalve? Where do buy these things, I cannot find them anywhere. I would like to eliminate the one on my tank and put one after the electric booster pump, which is the highest point in my fuel system.

Your local speed shop look in an EARLs catalog

Not sure if there is such thing as a high flow version. We carry a 3/8 anti siphon valve for $9.99 (#620-1438). Give our tech department a call and see what they have to say.

Good Luck,
Brad

I have seen the Earl's valves but they are not spring and ball from what I read.

Can you link that part. It shows nothing when searching for that part number on your website.

Contact Imco. I believe they have a 1/2" check valve that is the largest I know about in the industry and it is what we require and recommend for any high performance marine engine over 525HP.
the smaller sizes can seriously restrict fuel flow and lean out the engine,when the engine is fuel injected and do serious engine damage under high loads.

Best Regards,
Ray @ Raylar

Aeromotive. It's in the Summit catalog.

those things are terribly restrictive, have had lots of issues with mine getting clogged with small peices of aluminum for what looks to be where they tapped the inlets...it's a wonder the engines would run at all with these things...Rob