Be careful not to overtighten bajo bolts if you have one...they crack easily! Been there, done that...
If the jog ampngst injectors fits fine yet you are short (or long) on the injector to pump, filter or where ever it goes, perhaps a cut in the pipe, a section of hose and some hose clamps would be simplest...Low pressure side on many diesels are just little press on tubes between the injectors with no clamps. Measure the od of the steel
, copper or whatever it is and see if a fuel hose id can work.
Rinse out well (use diesel) after cutting and I'd stay away from sand in my fuel pump thanks...Careful even pressure over a suitible radius (piece of pipe) should do well for small diameter tube if you want to bend it. The sand thing can help with thin walled larger diameter tube but you really need some heat for it to be effective, allowing the outer material to stretch and the inner material to "upset" or thicken. Then the sand is all baked on the inside and not really suitible to this aplication IMHO.
Stay simple. If it can't be bent a little to be made to fit easily, use the ends as the fittings and hose between them...My Yanmar
,3 Mercedes, 2 VW, Allis Chalmers, 3 Cummins, Toyota, Kabota all have hose in various configurations on the low pressur return side. Only the Allis Chalmers has the funky steel link between injectors but then goes to hose to the pump/tank return T. The International is common rail so that's a whole 'nother kettle of fish