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south texas | Worked at Deere dealership for 26 yrs. The fuel supply hose from the fuel filter to injection pump. Bio diesel will cause that line to swell up internally and severely restrict fuel flow. I noticed yours has been replaced and it looks like the fittings are crimped way to tight for fuel line. Hyd hose and fittings will not flow correctly either. Also blow out the return line that goes from pump to injector return lines then to top of tank.
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JD 4430
