These adapter fittings are available in 3/8" and 5/16" sizes. They push-on and secure to most modern USA, European, Japanese, etc. fuel injection systems and are used to convert an OEM SAE hard line connection to -6AN male or 5/16" barb.
The fitting needed for Evo 4-9 feed and return from top of the sender unit is 3/8 Female PN: 14-0145
The billet fittings are machined from 6061 aluminum and bright dipped type-II anodized to resist corrosion. The female fittings are black and the male fittings are Radium green. Radium 14-0227 uses a 3/8" SAE female connection with a 90 degree 5/16" nylon barb (shown below).
NOTE: To determine the required size, simply measure the outside diameter of the male fitting.