Fuel Regulator air bubbles

Reply Subscribe

Thread Tools

Search this Thread

Oct 9, 2011 | 05:05 PM

weldworks54

Thread Starter

Senior User

Joined: Apr 2009

Posts: 318

Likes: 0

Fuel Regulator air bubbles

I changed out my thermostat to do and while I had the tools out and some time on my hands. I went ahead and checked the fuel pressure regulator for air bubbles and i don't know if this is normal? What I found with upper filter out. KOEO while fuel was pumping in the fuel was full of air bubbles " looked like a drink that had been shook up" when that all settled out I got some air bubbles out of the largest metal line back into the regulator. I wish I could post a picture! What could be causing the air bubbles coming from the pump? Or is this normal? I am guessing the the last air bubbles are from a injector o-ring? And lastly could this be my bucking and jerking problem I've been having? The fuel pressure is 64 psi

Oct 9, 2011 | 05:34 PM

Unrealo4

Posting Guru

Joined: Nov 2010

Posts: 1,347

Likes: 0

From: Eagle Mountian, Utah

You're injectors would be suspect if you were cranking while bubbles were present. At KOEO that would be fuel pump related. Possibly a cross threaded fuel filter lid on the HFCM.

Oct 9, 2011 | 05:50 PM

weldworks54

Thread Starter

Senior User

Joined: Apr 2009

Posts: 318

Likes: 0

I checked it and actually torqued it witha torque wrench just to be sure it was tight

Oct 9, 2011 | 06:11 PM

cheezit

Post Fiend

Joined: Oct 2009

Posts: 12,123

Likes: 35

From: N. Fort Worth, tx

you need to check this with the system closed using a clean line.

Oct 9, 2011 | 06:54 PM

weldworks54

Thread Starter

Senior User

Joined: Apr 2009

Posts: 318

Likes: 0

Cheezit sorry but I don't understand. hook a clear line in to the test port? I am also hearing a slight sucking noise at the upper fuel pressure regulator. Cap isn't cracked I just replaced it and o-ring looks good