hello all. i have an '81 rabbit diesel that will not start. i've noticed in the past couple months that it has progressively gotten harder to start and now it will not start at all. new fuel filter, pulled a return line off of the first injector and got fuel flow when trying to start (not a lot but there was some), i've jumped the fuel stop solenoid out to the battery to test that, checked the fuse for the glow plugs and verified voltage going to the glow plugs. i did replace the head gasket last year and the seal in the IP where the cold start lever assembly attaches. there doens't appear to be any leaking from the IP that would encourage air to get into the system. still will not start. any other ideas before i dump it off at the garage!? thanks!