Hi,
I have the 1997 s420 and I added some marvel mystery additive to the fuel and once the tank reached 3/4 the low fuel light started to blink and eventually the CEL came on with a code p0455. I did some basic tests like vucum check on all the lines in the purge system including Charcoil canister and fuel tank and every component holds vacum. Any help is appreciated.
thank you.