The fuel sampler/strainer assembly includes a housing formed of fuel resistant material including a transparent elongated main body, a fuel receiving portion at an upper end thereof, and a fuel exiting portion also at the upper end thereof. The elongated main body has a closed lower end. The fuel receiving portion is generally tubular and has spaced-apart indentations in its upper end edge for alignment and cooperation with associated actuating arms of a pet cock drain valve. A rod is removably attachable at a first end to the fuel receiving portion and extends along a central axis of the fuel receiving portion and beyond the upper end edge of the fuel receiving portion so as to engage and manipulate a ball and spring drain valve at a second end of the rod. The fuel exiting portion includes a filter screen functioning as a barrier to water and desired particulate debris. A first protective cap fits over the fuel receiving portion for containing evaporative fumes while the fuel sampler/strainer assembly is being stowed. A second protective cap fits over the fuel exiting portion for similar purposes.