I have nasty tick at idle. Searched here for a while and found 3 possibilities: lift pump, of valve, and maybe fuel ines getting air in them. I alreay have new rubber line to put in. Could that be the problem? It sorta sounds like a pulse back near the cab. I read in another thread about a return line tick. I can't tell of any performance loss, but it does crank a little longer when starting.

 

Yep, its the fuel lines. Replace those problem lines and the tick will be gone. Worked for me, I had the same problem. I could hear it real good standing on the drivers side of the cab near the door.

 

I will be replacing those line this Saturday. I've had them for 3 weeks. Just been putting it off My nuckles are large and already pretty beat up.

 

Mine was the overflow valve.
Made alot more noise when the fuel filter was dirty too.....

SFB