kegserv

Hello - I've just fixed such a problem on a 1989 2.5TD 90. As Les said, it was the Injection pump boost diaphragm, and after changing it (1 hour, following the instructions posted by Les), the engine is transformed, with top speed up from 60 to 75 and far more power with less smoke and easier starting. Drilling holes in the fuel cap to stop pressurising seems like treating the symptom rather than the cause. I followed a post on another forum to find the part, and I got mine easily from Atlantic Diesel Services in Southampton - tel 023 8066 3990. Cost was £21.95 including postage. They know the part number, but it was a Delphi - 7243-006 / ADNSCJ 595699. As a footnote, to help diagnosis, I held the revs high for a minute whilst stationary, then stopped the engine and removed the fuel cap, which almost blew off, which confirmed pressure.