do you know what was the substance that caused
bad quality of diesel
some hint maybe
for instance
if it was gasoline we might think of one thing
if it was water we might think of something else
and if it was some bio-product we might think of another method
something as simple as weighing the sample versus a control may be a test
If you question is can I test all the possibilities of stuff in my fuel
that would be a daunting task for home testing much less lab testing