Well I changed my filter on my fuel pump with a new one and I'm still having the problem.. :/
How do I check voltage at the fuel pump like some of you have suggested?

 

bump

 

Anyone?

 

bump

 

Hi, did you ever figure it out? I am having the same problem. When I start it up the fuel pressure is around 40psi. After the car is warm and I drive it for a minute, the fuel pressure drops to 25-30psi.

 

i believe this is normal. when the car starts up the fuel pump runs max voltage then after a few seconds switches to low voltage mode. the map referenced is load vs rpm, so i'm guessing this is the trigger point here OR there is a time based fuel pump voltage map used for starting the car. either way, no worry.


i will say however, 25 psi seems on the low side.

base fuel pressure stock is 3bar (43.5 psi). this should be set without vacuum. so after vacuum is applied through a 1:1 regulator (approx -11 psi). you should be around 32 psi theorotically but typically it seems to work out around 38 psi.