Hey,


Flare wrenches are designed to hold all sides of the line fitting, not just the 2 sides like a regular wrench. Keeps from rounding off the soft brass or other metal fittings.

heres the address of an example on the craftsman site:
http://www.sears.com/sr/product/summary/displayimage.jsp?BV_SessionID=@@@@2018720940.1011537375@@@@&BV_EngineID=eladcddiegmfdbggcmgclchm.0&oid=1073754921&path=%2fdata%2fproduct_images%2ftools%2flarge%2f00944176000-dlv.jpg&searsno=44176&name=10+x+12mm+Flare+Nut+Metric+Wrench


One last thing, you could probably also benefit from a "ball end" style allen wrench, because you will have to kinda angle the allen wrench on cylinder 3 or 4 as I remember.... been a while but I think something mildly obstructed access to the injector retainer.
http://www.sears.com/sr/product/summary/displayimage.jsp?BV_SessionID=@@@@2018720940.1011537375@@@@&BV_EngineID=eladcddiegmfdbggcmgclchm.0&oid=1073755204&path=%2fdata%2fproduct_images%2ftools%2flarge%2f00946767000-dlv.jpg&searsno=46767&name=1%2f4+in.+Ball+End+Hex+Key
Take Care


Jason