If the engine starts without difficulty in the cold it's probably OK so
the fuel system is the prime suspect. The fuel filters may be OK but
there's a screen inside the tank and after almost 30 years .....
Ever have an algae problem - it grows in the condensation inside the
fuel tank and no, #2 diesel doesn't kill it, an algaecide kills it. But
that's the next step, first consider the tank's screen.
Anyone put gasoline into the fuel tank? Or if this is a sudden event the
#2 diesel may just be lousy.
Finally, the ultra low sulfur #2 diesel may be causing the old fuel
hoses to swell and close up - a possibility to consider for they'll
eventually start leaking (sweating first).
© 2007 T.G.Lambach. Publication in any form requires prior written
Click to see the full signature.