Obtaining Fuel System Sample

A fuel sample should be taken from several locations in the fuel system. An approximate 1 cup sample should be obtained from before the fuel filter, after the fuel filter, fuel injection pump return, and fuel rail return.
The samples should be immediately checked for hard particle debris, cloudiness, color, and off odor. Then the samples should sit in a dust free environment for at least 2 hours to look for any separation.

Disconnect the appropriate fuel feed or return line quick-connect fitting. Refer to QUICK-CONNECT FITTINGS .
Install the appropriate Fuel Line Adapters / Fitting from the (special tool #8978A, Decay Tool, Fuel). Route the opposite end of this hose and bottle to a secure location.
Using a diagnostic scan tool, activate the fuel pump until 1 cup of fuel is obtained.