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Old 08-22-2019, 09:08 PM   #11
ahardb0dy
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may want to check the vent line from the tank
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Old 08-23-2019, 09:13 AM   #12
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The gas tank is semi pressurised.
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Old 09-03-2019, 11:29 AM   #13
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I had the same issue turned out to be the fuel tank cap. It also helps to keep the tank full.
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Old 01-15-2020, 04:18 PM   #14
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I was working on the truck with the battery disconnected and the noise manifested itself again. Loosening the cap did stop the sound.
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Old 01-15-2020, 08:36 PM   #15
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I've never heard the sound, but it sounds like pressure is being released when you loosen the gas cap. Maybe converting to a vented style gas cap would fix the pressure build up.

:::Copied from the internet::::

Vented Gas Cap Function

The vented gas cap is designed to vent small amounts of air into the car gas tank line. The vented gas cap has a one-way release valve that is pressure-activated. When the pressure reaches a certain point (defined by so many pounds per square inch) the valve opens by a very small amount, relieving some of the pressure. In this case, the pressure is formed on the outside of the tank, due to the vacuum formed from the displacement of fuel on the inside. After the pressure inside the line equalizes, the pressure valve closes. The valve is set to balance the pressure with the surrounding atmosphere. Air is allowed in, but no fumes are allowed out of the gas cap, because of environmental concerns.



Inner Parts

The vented gas cap has a chamber under the plastic cap handle that inserts into the fuel fill line. The cap screws shut, and this chamber fits relatively close inside the intake tube of the fuel line running to the tank. On each side of the chamber are small openings where air is able to enter. These chambers lead to the pressure valve, which, as the level in the tank decreases, allows air inside to remove any possibility of a vacuum forming.



How it All Works

Because the fuel tank is pressure-driven from a fuel pump and gas naturally expands and evaporates, a large amount of pressure can build up inside the fuel system over time. This second kind of pressure is taken care of through the operation of the fuel pump mechanism, as the vented gas cap needs to be the one-way flap to keep evaporated gas fumes in.

Last edited by PoBoi850; 01-15-2020 at 08:44 PM.
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