379 fuel tank crossover questions

Discussion in 'Peterbilt Forum' started by Dennsco, Dec 27, 2020.

  1. Dennsco

    Dennsco Bobtail Member

    11
    14
    Jun 24, 2020
    Saguache Colorado
    0
    I recently purchased a used 93 379 with the 3406b cat that has the older gravity-fed fuel crossovers at the bottom of the tanks, but the passenger side tank has been plugged at the outlet and it's only drawing off the driver's tank. I would like to get them both back in proper working order but am unclear how they are plumbed.
    Years ago I had run over something on the highway in an international cabover and ripped the crossover line off but was able to turn off the valves and limp it to the next truck stop. Now after thinking about how vulnerable that setup is I have been considering looking into upgrading to top draw, but is that even possible for these older trucks? Has anyone here done that or has any advice? Is it a pita and expensive or should I just leave it as is and fix the original low hanging crossover?
     
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  3. Roger McG

    Roger McG Light Load Member

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    Oct 22, 2016
    western mass
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    Peterbilt fuel tanks draw from the bottom there is no standpipe to draw fuel from the top. The crossover line setup was used by peterbilt for years. Fuel tanks not balancing could be the vents on top of the tank
     
    Dennsco Thanks this.
  4. Dennsco

    Dennsco Bobtail Member

    11
    14
    Jun 24, 2020
    Saguache Colorado
    0
    Thanks for the reply Roger, I am not very knowledgeable on the fuel setup for these petes, and since most of the lines are missing except the main draw and return to the drivers side I have to make new ones and figure out how to route them properly so I can use both tanks. I am guessing I need a fuel line splitter valve and a return line splitter to equalize them both.
     
  5. wore out

    wore out Numbered Classic

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    Jun 5, 2013
    CHASIN THE DEVIL'S HERD
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    Real easy. Put a tee at left fuel tank outlet. Run right fuel tank to it. Run the 3rd out let of tee to the motor. Let all the return in the left tank which is where it currently is
     
    Dennsco, Roger McG and pushbroom Thank this.
  6. Dennsco

    Dennsco Bobtail Member

    11
    14
    Jun 24, 2020
    Saguache Colorado
    0
    Thanks Wore out! I am working on it today!
     
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