Fuel Not drawing from Passenger Side Tank

Disconnect return line on top of tank and see if fuel is returning to tank with the truck running. If so you should have a shut off valve on the bottom of both tanks, turn them both off and remove the fuel lines. Then open valves one at a time and see that when fuel comes out of the valve it is at the same height on both valves. If not then you have a blockage in the valve at the bottom of the tank. Also check the vent on the top of the tank to make sure there is no blockage in the vent.

If all that checks out then you more than likely have a bad splitter valve. Follow the fuel lines from the tank to the valve, it is located behind the transmission mounted on a crossmember. Replace the splitter valve, it equals the draw and return of the fuel from both tanks.

 

turn the pick up back on, on the top of the tank

 

I have the same issue with my set up 379 pete that I just bought, I already tried the clean the cap and the vent lines... still no go it still won't level. It's a car hauler 379 3406e 1999 any ideas ?

 

I might check the vent tube too... hopefully it will solve my problem too.

 

My husband had the same issue on our Pete for about 7 months. He did all the above mentioned repairs and finally was able to see that the problem was a plastic stopper from a gallon of Lucas had fallen in and was plugging the hole. Once he took that out the problem was solved.

 

I cannot believe how many Pete's this happens to. Every time I hear this, it's always a Pete, wow.

 

The only time neccessary to replace the splitter valve as you call it (actually it's an equalizer block, is if it has been damaged via line removal, bad threads, or gasket leak that won't seal with a new gasket. The valve (block) itself has no moving parts. The only reason it has a sealed top to it was for machining purposes.
The most common cause of tank levels being different is aged fuel lines that either collaspe internally or crack beneath the sheath liner and suck air or get saturated with fuel until it becomes a minor fuel drip...

 

Mine sometimes wont suck from the drivers side....should a guy try the same tricks for this side as well or could this be somethin different....05 379 w dual 150 gal tanks..