Said It Here

Why is there a mysterious hole in my fuel tank?

Some plastic vehicle tanks develop unexplained punctures that leave the tank empty, with edges pushed outward rather than inward and no metal shavings or swarf around the hole. This leaves owners worried and unable to find matching examples or explanations online, making it difficult to determine how the damage occurred.

Overview
People affected2 accounts across 2 forums
Workarounds found3 items attempted
Community agreement51 total upvotes

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

Found another way around this?

Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.

  1. 1
    consulting local mechanics
    Did this help you?
  2. 2
    asking for opinions on online mechanic forums
    Did this help you?
  3. 3
    considering makeshift sealants like JB Weld
    Did this help you?

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.

r/MechanicAdvice1 person · September 2026

“Found out last night my van had no diesel left. Turned out there's this hole in the bottom of the tank.”source ↗

“What's odd to me: no shavings or swarf anywhere, but the edge is pushed outward rather than in.”source ↗

netlob · r/MechanicAdvice · 50 upvotes
r/AskMechanics1 person · September 2026

“was doing brakes when i got under to check something else and saw this small hole in the transmission”source ↗

Expression_Possible · r/AskMechanics · 2 upvotes

“was worried because i searched about it and couldn't find the same transmission with a hole there or nearby, all of them were covered”source ↗

Expression_Possible · r/AskMechanics · 1 upvotes

Where this came up

People with this problem also raised