Good project better than some of the rubbish undergrads do.
It take it you did your 12 hours in a PA38?
The easy way would be to go and visit the maint organisation for the club you used to fly with.
They will have a heap of books and microfiche on everything to do with the systems. If you go cap in hand with packets of biscuits and or a big bag of doughnuts you will find them reasonabely helpful.
The books etc are taking the wee expensive.
Comments like "you can teach a monkey to ride a bike, but not to fix it" will go down well.
Something you could also consider is a handheld fuel/water sensor to allow people to check the quality before it goes in the tanks. No point knowing about a problem after you have bought and payed for a fuel uplift. Generally by the time the bowser has driven to the aircraft any water is in solution so even if you check the tanks after filling up you won't spot it.