Is this normal??????????

[mustangfan1990]

I hooked up my fuel pressure gauge a minute ago and when I did. I just turned on the key to start the fuel pump and the guage went to 40. Thats with the engine not running. Then I crank it and it drops to 35 when I rev it and then at idle it goes back up to 40. I would think this is normal drop when I rev it because the fuel injectors are opening up more so the pressure drops I just wanted to see if those numbers sound right..

 

[Mustang5L5]

They sould right, but with your mods you really should be condering a custom tune vs messing with the fuel pressure. You are running an FMU with the 24#ers right?

I would personally ditch that setup for some 42's and go get a custom tune.

 

[5spd GT]

Assuming your numbers are with the blower as well, your numbers are very low.

I agree, if you have the heads, cam, and intake plus the supercharger, the injectors need to flip-flop positions.

24 - 42

 

[mustangfan1990]

Assuming your numbers are with the blower as well, your numbers are very low.

I agree, if you have the heads, cam, and intake plus the supercharger, the injectors need to flip-flop positions.

24 - 42

The blower isnt on yet.....I am still waiting on it to get here. Those are my numbers with HIC setup that I have. I will get 42s and a custom tune but I have to run with the FMU til I get the money to that.