You cant run it like that. Itll die because youd have a super huge vacuum leak that your AFM doesnt know about.



Just take the UIM off and jumper the little pin that primes the fuel pump. I dont know where it is on S4's ( or if they even have one... ) but on my S5, it was near the passenger side front shock tower. I think it was yellow. Just fold over a paper clip and stick it in there and you should hear your fuel pump turn on.









EDIT: I thought you were talking about running the engine with it off...

Now I see youre not. Sorry. https://www.nopistons.com/forums/pub...IR#>/wacko.png