So for some reason my fuel pressure is really high. When I am sitting there in neutral and rev up to like 4k my fuel pressure gauge says +6 BAR. I allready replaced the fuel pressure regulator and fuel pressure soleniod (both stock). All the lines seem to be in good shape (return) and there is no clog in the return line. The vacuum lines are all routed just like stock.

So could this possible be the UTEC?

I have a Walbro 255, Fuel Rail, 700cc injectors, and UTEC

Please help, this is not good getting 50 miles to half a tank of gas!

Chris

 

no one??

 

it can't be the UTEC. That sounds more like what oil pressure should do, not fuel pressure. The Utec has no way of controlling fuel pressure, and a standard Walbro replacement pump won't cause that high of fuel pressure at idle, or rev'ing the engine.

Couple questions to help troubleshoot. Which Walbro did you get? Is it the standard that everyone else is using in the EVO? Base fuel pressure should be about 43#'s. At idle, it should be 43#'s minus whatever vacuum the manifold is under. So, if you disconnect the manifold vacuum line to the regulator with the car idling, fuel pressure should jump up about 7-8#'s (since your running 272's), and when you reconnect it, it should drop back down. Does the fuel pressure gauge respond that way? Does it still add fuel pressure on a one to one ratio with boost? For example, when boosting 20#'s, do you add 27-28 #'s more pressure than when at idle?

Is there any way you can be confusing fuel pressure with oil pressure?