a propane torch would be ok. if you watch myth busters they held a propane torch to diesel and it would not stay burning. i'd be more worried about the hoses as mentioned before.

__________________
-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto