Metal injection lines breaking (2x) 1.6na

[purvisgs]

One of the metal injection lines (#2 cyl) cracked right by the injector nut a couple of wees ago, and I assumed previous owner may have not tightened correctly , or just old metal line, bad motor mounts etc. 

I replaced with a used one and made sure the line clamps were on correctly and tightened the lines down correctly.  I just had the replacement line break in the same spot -after about 50 miles driving it.

Any advice?  Injector is not obviously "loose" or anything, threads look fine, and I know it vibrates a little more than average (could use motor mounts). but ?

Anything I might be missing, even the obvious..would be greatly appreciated.

Thanks!

[745 turbogreasel]

You need the dampers that clip the lines together.
You must loosen the lines before  rotating the pump to relieve torsional stress.
If a ham fisted gorilla sits on them, they may crack later.

That's all I got.

[CRSMP5]

the admin of the kubvan fourms has just broken 3 in the past few mo.. il tell you what i told him...

loose pump, motor mount bracket bolts need checked too..
no clamps between the lines
no one loosened/retightened the lines after a pump adjustment..

those are the 3 things i know of... a injector sticking.. i highly doubt it...

[CRSMP5]

http://www.ebay.ca/itm/Emergency-Diesel-Fuel-Injection-Injector-Line-/221034658907?pt=Motors_Car_Truck_Parts_Accessories&hash=item3376b13c5b