Anyone have problems with fuel preasure not being steady? I have a GT supercar pump in Mustang GT canister and was working fine. I'm curious if its the pump or the controller taking a crap. Fuel psi bounces from as low as 20 to as high as 50 and most of the time is jumps from 30 to 45 at idle and at a steady throttle position.

 

if I'm not mistaken, when using a GT(40) pump you need toget the upgraded FPDM from Mark at Zone Five Performance, if you'd have used a SVT Focus pump, it wouldn't be a problem.....

 

I just ordered an SVT Foucs pump today, do you think the FPDM is ok still?

 

you'll be fine wth the stock FPDM and who did you order the pump fromas there are @5 Focus pumps but only 1 SVT Focus pump, we sell them for $95.00 + shipping

 

Dam wish I knew that before but I ordered the Steeda Focus pump.

 

Fuel preasure is good now I still have a part throttle surge that I can't get rid of, any ideas, I cleaned IAC new O2 sensors and checked for vaccuum leaks. How about in my tune??? any idea where to go in the program to get rid of this???? HElp please