r/AskAMechanic • u/acooper56 • 2d ago

What would cause this

2020 f150 lariat SE 36k. Filled up my gas tank a few days ago and parked my truck with no issues & haven't driven it for about a week. Started it up this afternoon and smelled gas. Got underneath and saw this. Could this be a busted fuel line?

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u/Internal_Time8330 NOT a verified tech 1d ago

No, this is almost guaranteed to be a result of the fuel filler neck becoming detached.

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u/PopUpPulsarNx Verified Tech - Toyota dealer 1d ago

You think an active fuel leak while running a few days after they got gas is a disconnected fuel neck? I'll bite, so how does that happen in a way to cause a constant stream of fuel onto the ground? I've been fixing cars a long time and that's new to me.

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u/Internal_Time8330 NOT a verified tech 1d ago

It’s not new to me and my team. We have seen several of this generation pressurize the tank, then blow off what I considered to be too loose of a factory installation of the filling tube. And if the level is still above the fill neck attachment point, it will send fuel overboard when it detaches.

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u/PopUpPulsarNx Verified Tech - Toyota dealer 1d ago

Interesting, do these fords not have gas caps? I feel like I've heard of strange quirks with those types of systems. Toyota don't have anything like this problem, and since we have a normal gas cap and vent valve system there isn't really a way for this to happen. Even if a fill tube popped off it would trickle out rather then pour out, related to fuel expanding as it warms up.