What 177.834(j) means in plain language
When you transport hazardous materials in a tank vehicle, every opening—whether it's a manhole cover on top of the tank or a valve used to load and unload cargo—must be fully closed and sealed. If inspectors find a manhole that isn't latched down, a valve that's loose, or evidence of leakage from either, you've violated 177.834(j).
This rule exists because an open or leaking manhole or valve can spill hazmat onto the roadway, into the environment, or expose nearby people to dangerous fumes or liquids. The regulation requires that these closure points be both fully shut and completely leak-free during transport. A small drip counts. A slightly loose cap counts. Both create enforcement action.
What our enforcement data actually shows
Across our 13 million inspection records, 177.834(j) has generated 231 all-time citations, ranking #1172 of 3,036 FMCSR codes by citation volume. Over the last 12 months and the last 90 days, we see zero citations for this violation—an unusually quiet enforcement pattern.
What stands out sharply is the out-of-service rate. Our data shows that 220 of those 231 citations resulted in the vehicle being placed out of service, a 95.2% OOS rate. This is nearly triple the all-FMCSR average of 31.4%, meaning inspectors treat this violation as a serious safety hazard. When you're cited for 177.834(j), the expectation is not just a fine—it's that your truck is unsafe to move until the problem is fixed.
Who gets cited most
Our inspection records do not include state-level breakdowns for this code in our current dataset. However, our data shows that carriers operating hazmat tanks, such as United Petroleum Transports Inc (USDOT 185040) and G & G Fuel Inc (USDOT 1611618), each appear in 4 citations across our all-time records. Equipment Transport LLC (USDOT 1758904), Ace Petro Group LLC (USDOT 2560999), and Fisher's Fuel Inc (USDOT 457963) each have 3 citations on record.
Vehicle-wise, the violation is most frequently cited on Kenworth (KW) trucks—23 citations—followed by Freightliner (FRHT) at 22 citations and Peterbilt (PTRB) and Heil tankers tied at 16 citations each. This distribution reflects the population of tank vehicles on the road rather than a defect inherent to any brand, but it suggests that any driver of these common tanker chassis should be especially diligent about pre-trip manhole and valve checks.
How severe is this compared to similar codes
In the hazardous materials category, 177.834(j) is less cited but far more consequential per citation than many peers. General loading and unloading violations—177.834A-HMC and 177.834(a)—each generated thousands of citations (3,954 and 3,839 respectively) with OOS rates of 99.2% and 97.9%. Placarding violations like 177.817(a) have 2,274 citations but a lower 75.1% OOS rate. By contrast, 177.834(j)'s 231 citations with a 95.2% OOS rate signal a violation that is rarer but taken extremely seriously when found.
Placarding condition violations—172.516(c)(6)—show only a 1.6% OOS rate despite 1,796 citations, revealing that visual damage to placards is treated as minor. Manhole and valve sealing, by contrast, poses an immediate spill or exposure risk and is treated as an emergency defect.
How to avoid it
Most of these violations are preventable with systematic pre-trip and post-load inspection:
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Perform a tactile manhole check before every departure. Walk around your tank, locate all manhole covers, and physically confirm each one is seated and hand-tight. Don't assume it from the cab. Do this before fuel or cargo is loaded, and again after loading is complete.
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Inspect all valves for tightness and visible leakage. Check discharge valves, dome covers, and emergency relief valves for drips, residue, or loose fittings. Wipe them down to spot fresh leakage. A valve that is weeping is a violation waiting to be cited.
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Document your checks in a logbook or driver checklist. Write down the date, time, vehicle number, and what you inspected. This becomes evidence that you caught and corrected problems before an inspector did.
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Report loose or damaged closures to maintenance immediately. If a manhole cover threads are stripped, a valve stem is bent, or any seal is compromised, do not haul the load. Contact your dispatch and get it fixed. A one-hour repair delay beats a 95% chance of roadside removal.
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Know your tank configuration. Learn where all closures are on your assigned vehicles. Some older or specialty tanks have unusual manhole locations or dual valves. Familiarize yourself so nothing is overlooked in a dark or rain-soaked pre-trip.
The data is clear: an open or leaking manhole or valve on a hazmat tank will almost certainly result in your truck being pulled out of service. Prevention is not only faster but mandatory.