Injection Line Flare Socket / Wrench / Tool After replacing and dynamically timing my IP, a couple of fuel line nuts at the pump got loose. That sent me looking for an SAE 5/8" (or 16mm) flared wrench or slotted tool to tighten fuel line nuts on the IP with the pump installed on the truck. Maybe I didn't look in the right place but it seemed like the answers were all over the place so I offer this as a consolidated report of all my OCD inspired findings. Please correct and add as needed: THE SEARCH FOR A FRUGAL (sub $30) Off The Shelf TOOL: Bupkus. Zip. Nada. Save some time. Hours of searching revealed there are a crap-ton of these tools available to service Cummins, MB, BMW, etc, but none of the commonly manufactured no-name tools or sets I found are SAE 5/8" . None of the metric sets even had a 16mm. Apparently our Stanadyne DB2 pumps are the ONLY ones that use a 5/8" fuel line nut. GRRR. THE OFFICIAL TOOL: OTC-7460 by lakesurfer posted Dec 31, 2019 at 1:09 PM OTC made the Ford "Rotunda" tool and continue to sell the same tool under their part number. It used to be $50-60 and now is a ridiculous $138-170!!! As of this writing it is available online from multiple sources. Size: SAE 5/8" (6-point) Drive: 3/8" Overall length: 2.6" Part numbers: OTC-7460 OTC7460 OT7460 7460 303-230 T83T-9396A T83T-9396-A THE SNAP-ON TOOL: SnapOn-02 by lakesurfer posted Dec 31, 2019 at 1:53 PM SnapOn-01 by lakesurfer posted Dec 31, 2019 at 1:12 PM Avalable online from Snap-On for $60. I bought one used on eBay for $38 that included shipping. Size: SAE 5/8" (6-point) Drive: 3/8" Overall length: 2-27/32" (almost 3") Part number: FRX201 DIY: Many have apparently had good results using a 5/8" deep-well *impact* socket and cutting/grinding away material to create the tool. Research indicates it should be an impact socket to have enough material and rigidity so the flare doesn't flex when torqued. The donor socket probably needs to be at least 2.5" long. Some say cut out on a flat. The OTC and Snap-On tools cut out on a point though so one has to wonder if that was on purpose for strength. It is worth noting that at least one fortunate member here has posted a pic of an IDI-specific tool kit they own that includes another variation of the IP fuel line flare socket. I would love to know more about the manufacturer and part number of that entire kit. I appreciate this forum and have benefited greatly from your advice. I hope this is helpful to the group.