Automatic or manual? Surprised the little pump could handle that high of a viscosity if it was for a manual. We haven't been inside that pump for a while. We actually took it off to get resealed and to put it aside as a candidate for the 12mm plunger. We put on a newer 4D56 pump in its place. Haven't tried running it without a lift pump, but then I also don't really I intend to take that lift pump back off