Fuel tanks not equalizing and left tank empties faster than right one

One time my fuel filter vacuum gauge was reading high so I pulled the filter and found a sliver of rubber about the diameter (sort of ovalish though) of a nickle sitting on top of the filter. I figured the fuel lines were deteriorating and put new lines from tank to pump.

I wonder if the pieces from your filter came from the tank or something. Every once in a while I'll run my tanks to 1/4 and get in there with a bright flashlight to inspect for any debris or water at the bottom of the tanks.

 

Well you're either mostly sucking from the left tank or mostly returning to the right tank. Usually a suction problem of some nature. Check the suction lines for the left side. DO NOT blow air through the lines back into the tank. If there is debris in the lines you just put it back in the tank and probably never get it out of the tank.

 

It will always favor the drivers side because of the crown in the road.

You'll always have a bit more fuel in pass tank.

 

Ya my 97 379 pulls slightly more from driver side than passenger side.

 

Vertical head pressure is a big factor on equal draw, and that is a function of tank diameter. Tank length doesn't effect it, so you can have two different capacity tanks that draw down at the same level, as long as they are the same diameter.

 

To anyone who pulls up this thread:

Turned my truck on and let it run, shut off the return valve to one tank, took off the fuel caps to watch the level in both tanks and waited,.....once the tanks evened out I turned the return valve I shut off to where I’m hoping it will keep the tanks even. If not, I’ll try again.