The adjustable end (with flanged hex) of cable should always go to the fuel pump end in the race car.
When installing the X-Large fuel pump cable in the race car, please make sure you attach the cable to the chassis or solid components on the chassis every 5".
These cables can spool up, especially when starting the engine. If the cable isn't securely attached to the chassis, it can come disengaged from the hex drive end.
Do not use plastic zip/cable ties. Stainless steel zip ties will work fine. The best clamps are the rubber-lined 3/4" Adel clamps. You can install the clamps with pop rivets, self-tapping screws, or bolts.
You must keep both ends of the first 4"-5" of cable straight and level coming out of the fuel pump, oil pump, or off the belt-drive bracket. If you can't tie the cable up every 7 or 5", you can split an aluminum tubing in half and install it around the cable casing, then hose-clamp it tight. Then secure tubing to a solid item on the car chassis or motor.
If the cable is longer than 14', we would recommend that you attach it to the chassis every 4".