Hi

Car hesitates under load in 4th and 5th gear.it can be driven hard through 1,2,3 and it pulls fine as soon as its put into 4th it hesitates and loses power.there are no codes coming up on our solus pro.in live data the kpa only drops on full throttle.its been into nissan and there diagnostic tool picks up no fault.thought it could maybe be the small filter in the pump which could be blocked and restricting fuel.but this pump doesnt have the filter.

Any ideas would be a big help