Sytec One Way Valves are manufactured to the highest stand, they are for use with petrol and diesel in both carburettor & fuel injection systems.  They have a wide variety of applications including , motorsport, rallying, racing, grass track, motorcycles, marine, boats, industrial plant, agriculture, tractors, lorries and custom fuel applications. 

These One Way Valves prevent fuel returning back through the system when the vehicle is non-operational. They are compatible with Petrol / E10 / E85 & Diesel and have advantage of being lightweight and compact.
 

The above figures obtained from independent testing