Field Guides / Worksheets & decision tools
Photographs are most valuable when taken before contamination evidence is cleaned or parts are replaced. A wide view proves where the object came from; a labeled close-up shows the observation. Neither image by itself proves the chemical identity of debris or the root cause. This checklist helps technicians collect useful evidence and mark what is actually documented.
Plan safe evidence collection
Only qualified personnel should take fuel samples and inspect high-pressure components using manufacturer-approved precautions. Do not place hands near fuel spray or work on live lines. Preserve original labels, tank/vehicle source, time and sampling method. Keep personal identifying information out of photos intended for publication without appropriate consent.
The checklist does not upload images and does not certify that a visible mark is metal, corrosion or a specific failure mode. Use qualified laboratory or component testing when the identification matters. The public DCT site uses real-case labels only when authentic records support them.
Prepare an evidence record
Share findings appropriately
Attach the completed list to the internal work order and discuss relevant evidence with the specialist through an authorized service inquiry. If supplier responsibility is disputed, preserve sample custody information and refrain from guessing at blame.
Contact DCT about a specific component
Use the authorized service inquiry to ask about testing or repair eligibility. A worksheet does not submit an inquiry or approve shipment.