probably the line that is normal to be bulged, cant think of the name of it.

i would check glow plug function and possibly change both fuel filters and if there are black dots in the clear filter, i would treat the fuel with fungicide.

after that it gets a little more complicated. if none of that does it check back and tell us what it is doing.

good luck

tom w

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.