Hi all,
I have a 1984 F150 with the dual tank setup. Today I was driving home and the truck sputtered and died like it ran out of gas. I put about 2 gallons of gas into the front tank, and it started right back up and I made it to a gas station. When I went to fill the tanks though, the rear tank was fully empty as expected, but the front tank was almost entirely full (took about 0.5 gallon before overflowing). I am completely stumped on how and why this would happen. If the tank was full, why did it die? First thought was a bad line or pump, but then how did it start again when the 2 gallons were added to the front?
Any thoughts or advice appreciated. Thanks!

 

Welcome to the forum. Lets see the truck. We like pics.

 

Deleted. Misunderstood question.

 

Holley carb?
I would see if you can blow through the inlet and check the needle and seat for sticking
Right, test the pump output and verify you have adequate fuel supply from both tanks
You go th replace the fuel pump on one of those old ones and it'll drain the tank while you have the line off
Verify it does that and if the pump sucks air, it will not pump
So, also verify the rubber supply hoses are not all cracked up, the one at the tank and the one up front at the frame

 

If it's only drawing fuel from the rear tank and you refilled the rear tank it would start again, I assume that's how you determined the rear tank was empty? Anyway if it's overflowing it would probably crossover to the empty tank anyway to relieve pressure.