This special 24 mm flare nut type wrench for Cummins diesel motors with common rail injection (#66150) from SP Tools will slide back into the recessed area of the cylinder head where the fuel line retainer screws into the head. Without this special depth and angles flare nut wrench, you cannot hold the 24 mm retainer in place while you loosen the 19 mm coupler to the high-pressure fuel lines. There is a high probability of bending a fuel line if the 24 mm flare nut is not held stationary when the 19 mm coupler is loosened. If the fuel line is bent, complete fuel rail system replacement is necessary an expensive and time-consuming procedure.
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