Tank siphoning
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Senior User
Joined: Nov 2003
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Tank siphoning
’86 F150 4x4 302FI with auto and dual tanks.
I’ve had some posts about my truck running good one day, stalling out, letting it sit, and then it will fire right up and run like nothing ever happened for a while.
I suspect it’s a fuel issue, so I was thinking it was a fuel pump problem. I know the previous owner, so I asked him if he ever had issues with fuel, and he said yes, he said it siphons from one take to the other, so you don’t ever want to run one tank empty. I did a search in the threads, and there was a thread from back in 2004, and it looked like it was related to tank switching valve, but it never really said if that fixed the problem or not. I thought maybe other people have run into this and have found that the valve is the problem. I was ready to pull the box off and switch out all the fuel pumps/sending units, so any info on this “tank siphoning” problem would be greatly appreciated.
I’ve had some posts about my truck running good one day, stalling out, letting it sit, and then it will fire right up and run like nothing ever happened for a while.
I suspect it’s a fuel issue, so I was thinking it was a fuel pump problem. I know the previous owner, so I asked him if he ever had issues with fuel, and he said yes, he said it siphons from one take to the other, so you don’t ever want to run one tank empty. I did a search in the threads, and there was a thread from back in 2004, and it looked like it was related to tank switching valve, but it never really said if that fixed the problem or not. I thought maybe other people have run into this and have found that the valve is the problem. I was ready to pull the box off and switch out all the fuel pumps/sending units, so any info on this “tank siphoning” problem would be greatly appreciated.
Elder User
Joined: Apr 2010
Posts: 901
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From: South Jersey
it's most likely the fuel tank selector valve. look underneath on the drivers side frame rail a little north of the front tank and you'll see a round and square black thing about the size of a fist with 4 lines running toward the rear and 2 running to the front. That's the valve and there's a 99% chance that's your problem. it's pretty common. i had the same issue with mine, replaced it, and i've been fine since.
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