Mercedes 240 run well on biodiesel, on my 1984 300d 144,000 miles I havent changed the fuel pipes inside the car (have'nt need to)
BUT carry spare fuel filters, the inline one before the pump saves the cannister one (a wee bit!), also you will eventually have to clean out the nylon sock filter at the bottom of the tank I had to after 20K easy enough to do just make sure the tank is nearly empty before starting!!!!!!
Be prepared to change the rubber surround at the tank filler because if you spill bio it will dissolve.
In 30,000+ miles on bio apart from filters (which are a pain) it has been all positive, lower emissions being one big advantage

if its homemade as long as it is clear it should be OK

so good luck



Des