Hole in pick up tube or vapor locking?
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Laughing Gas
Joined: Apr 2024
Posts: 805
Likes: 262
From: Laramie Wyoming
Hole in pick up tube or vapor locking?
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When my truck gets below half, maybe 3/8’s of a tank, it starts to act like it’s starving for fuel. You can’t run watch the AFR gauge and it goes lean and the rich when it catches up. It is one hundred percent dependent upon how much fuel
is in the tank. As soon as you fill it up the problem goes away.
The tank is a LMC reproduction tank. I’m wondering if there is a pinhole or something in the pickup tube in the tank that’s around that 3/8’s mark or if it’s vapor locking?
Any ideas?
When my truck gets below half, maybe 3/8’s of a tank, it starts to act like it’s starving for fuel. You can’t run watch the AFR gauge and it goes lean and the rich when it catches up. It is one hundred percent dependent upon how much fuel
is in the tank. As soon as you fill it up the problem goes away.
The tank is a LMC reproduction tank. I’m wondering if there is a pinhole or something in the pickup tube in the tank that’s around that 3/8’s mark or if it’s vapor locking?
Any ideas?
Logistics Pro
Joined: Mar 2009
Posts: 4,855
Likes: 608
From: Minnesota
I would look into repairing what you have. Just not sure how? Pull the sender out and make sure the tank is above the level you are having the issue at. Then apply a little pressure through the pick-up tube and see if you can locate the leak? Once located, the hard part will be the repair. But finding the issue should be the first step. If there isn't a leak, something else is causing your problem.
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Fleet Mechanic
Joined: Aug 2007
Posts: 1,834
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From: Piney Woods of East Texas
Is your fuel cap not venting? When you release the cap do you hear any hiss or sound indicating a vacuum?
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Thread Starter
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Laughing Gas
Joined: Apr 2024
Posts: 805
Likes: 262
From: Laramie Wyoming
I would look into repairing what you have. Just not sure how? Pull the sender out and make sure the tank is above the level you are having the issue at. Then apply a little pressure through the pick-up tube and see if you can locate the leak? Once located, the hard part will be the repair. But finding the issue should be the first step. If there isn't a leak, something else is causing your problem.
Thread Starter
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Laughing Gas
Joined: Apr 2024
Posts: 805
Likes: 262
From: Laramie Wyoming
it appears to be venting. No indications of vacuum
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