I noticed a fuel leak on my truck after putting in new injectors and it seems to be coming from a banjo bolt on the back of the head. What is this fuel line for? Im guessing it circulates fuel through the head to heat it but I dont see any lines coming out!

Thanks,
Josh

 

It's the fuel return back to the tank.

 

Where is it getting fuel from? The injectors and supply lines look like a one way street... Sorry just trying to understand this thing.

 

There are two lines going into the side of the injection pump.
The rear-most one is the feed from the fuel filter, the other is the fuel return.

1. Fuel Transfer (Lift) Pump
1. Lift Pump
2. Fuel Return Line (to Fuel Tank)
3. Fuel Supply Line (Low Pressure, to Engine)
4. Fuel Heater
5. Water-in-Fuel (WIF) Sensor
6. Fuel FilterlWater Separator
7. IA T Sensor
8. Map (Boost) Sensor
9. Fuel Drain Manifold
10. CKP Sensor
11. CMP Sensor
12. Overflow Valve
13. Drain Valve
14. Fuel Pressure Test Potts
15. ECM
16. ECT Sensor
17. Fuel Injection Pump
18. Throttle Lever Bell Crank and Apps
19, High-Pressure Fuel Lines
20. Fuel Injectors
21. Fuel Heater Temperature Sensor (Thermostat)
22. Oil Pressure Sensor
23. Fuel Injector Connector
24. Drain Tube
25. Intake Manifold Air Heater/Elements

 

So there is fuel flowing through the head?

 

Yes, but not much.