A friend has a 2003 and I am not familiar with that fuel injection system as I have a 2001.

His dealer tells him that his #3 cylinder line leaks down and they want to replace his high pressure lines at a cost of $1,200. They think that will fix it but seem candid in admitting they are not certain.

If this is a so-called common rail, does it make sense that one cylinder's fuel circuit could leak down, and not the others? Must this line set be replaced in one assembly?

Any thoughts here? Thank you.