When I turn my car to accessory 2 position and the fuel pump primes. should I have a constant pressure or is it suppoesd to drop off if you dont start the car?

 

After I shut my car off it goes down to zero in a few seconds. I never had the problem before I installed a Walbro 255

 

right but what about if I still have it in acc2? should I still have a constant pressure?

 

If you have a stock fpr it should hold for awhile. If you have a aftermarket one (aeromotive or paxton), the fp drop to zero once the ignition is off or on AccII.

 

k yeah im using an aeromotive FPR and I dont have the car running yet but when I was pressurizing the system to check for fuel leaks I would see it go up hold for several seconds and then start dropping. Just wanted to make sure everything was cool.

 

Don't worry about. The oem are designed the hold fp for awhile once you turn off the ignition. It's for emission purposes. I did talk to the tech from aeromotive, they said it a normal for their fpr to drop to zero once the pump is not running.