Fuel Pressure staying high
Thread Starter
Instructor
Joined: Feb 2004
Posts: 141
Likes: 4
From: Scottsdale AZ
Fuel Pressure staying high
I'm wondering how long after allowing the fuel pump to run for the prescribed 2 seconds should the pressure stay high before bleeding off. And why does it bleed off?
Burning Brakes
Joined: Oct 2017
Posts: 823
Likes: 106
From: Somewhere near Fort Wayne, Indiana
In a perfect world it should hold that pressure indefinitely. Why it bleeds off is anyone's guess, bad check valve in the fuel pump, leaky pulsator, leaky regulator, leaky injectors, leaky connections, leaky hoses, leaky orings, etc.
Thread Starter
Instructor
Joined: Feb 2004
Posts: 141
Likes: 4
From: Scottsdale AZ
What I find interesting is that sometimes I'll still have maybe 20 PSI in the morning then after using the car the next day it'll have leaded down to zip. Lots of variables but I'm guessing is that if after shutting the engine off and a minute later I still have more than 20 PSI I probably have what one might call a "tight" system.
