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Old 01-13-2019, 05:35 PM   #1
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Lockable deck fill cap

Hey all,
Just asking if anyone has any experience with lockable deck fills?
I see several designs out there but curious how they hold up in a Marine environment.
My concern is diesel fuel theft if the boat is left in various places unattended.
Any input?
Thank you.
Taras
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Old 01-13-2019, 06:55 PM   #2
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I removed a fuel tank once. I put a locking cap on it and locked it so no one would make an oops. I then put locking caps on the rest of the fills to match but never locked them. So I’m not really being helpful. I can say I never saw any corrosion issues on the locking caps as they were all stainless or plastic.
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Old 01-13-2019, 07:05 PM   #3
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My first thought was, "yes, a locking fill cap makes sense". My second thought was,"if I'm worried about fuel theft, need to worry about what else might get stolen ". Last thing I want to do is piss off a fuel thief and get my boat vandalized.

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Old 01-13-2019, 07:28 PM   #4
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When I bought the boat, the dock side fuel tank was heavily contaminated with water, other side was fine...


If the PO pissed off a former girlfriend, or someone at the dockside bar... ?


Way too easy?


FWIW
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Old 01-13-2019, 07:28 PM   #5
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I've never seen a locking fuel cap on a boat, but I used to lock up my outboard with a stainless padlock and never had any issues... until I lost the key.
Now I don't bother.
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Old 01-13-2019, 07:30 PM   #6
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Quote:
Originally Posted by Roamer Blue View Post
When I bought the boat, the dock side fuel tank was heavily contaminated with water, other side was fine...


If the PO pissed off a former girlfriend, or someone at the dockside bar... ?


Way too easy?


FWIW
or a bad O-ring.
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Old 01-13-2019, 07:53 PM   #7
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I've never seen a locking fuel cap on a boat, but I used to lock up my outboard with a stainless padlock and never had any issues... until I lost the key.
Now I don't bother.
Combination padlocks will solve that missing key problem. Make all lock with the same combination.
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Old 01-13-2019, 07:59 PM   #8
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I don't worry about losing a padlock key. My Dremel tool with a fiber disk will unlock it in less than 30 seconds.

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Old 01-13-2019, 08:15 PM   #9
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or a bad O-ring.

Nope, old fashioned raised, trip over 'em, chrome monogrammed CC fuel caps and pipe, drop into steel barrel style tanks. No where for water to run, sit or flow.



I wondered and wondered how the heck... it was when we shifted to the opposite finger dock for the winter, that the potential and limitation dawned on me.
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Old 01-13-2019, 10:35 PM   #10
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Quote:
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When I bought the boat, the dock side fuel tank was heavily contaminated with water, other side was fine...


If the PO pissed off a former girlfriend, or someone at the dockside bar... ?
I know of a rally car which had sugar put in the gas tank... no accident there.
Unless the seller attracted haters a defective O ring sounds more plausible.
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Old 01-14-2019, 02:17 AM   #11
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As Ted says in post# 3, a lot more to steal on a boat than fuel. If I was worried about fuel theft, I'd move the boat to a more secure location. Our BC marina is very secure, never heard of a fuel theft. When cruising AK frontier justice is quite evident, good.
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Old 01-14-2019, 04:26 AM   #12
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Has anyone heard of this type of fuel theft?

I have heard of the gas tanks being stolen from dinghies but not the diesel tanks being drained. Lot easier I would think to steal from a truck.
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Old 01-14-2019, 05:04 AM   #13
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"Last thing I want to do is piss off a fuel thief and get my boat vandalized."

If you cant steal it, DESTROY it is a common motto.

Here in the Hurricane Hole someone was stealing gas from cars with a hose .

One enterprising lady left an ancient 6 gal outboard tank partially hidden.

It grew legs as expected and the entire neighborhood cheered as the offending car was towed away.
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Old 01-14-2019, 08:59 AM   #14
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At cost vs weight of diesel fuel, theft is highly unlikely. There is a reason you rarely see a fuel tank much larger than 5 gallons. Sure a few on rollers, but not hug tanks.

Unless someone can pull a truck with a tank up to your boat, they will hobbling down the dock repeatedly with a 5-gallon tank in each hand.

Otherwise, they are pulling a boat up to offload diesel. This is fairly conspicuous as well. IF they can afford a boat large enough to steal diesel, do they need to steal diesel??

This is not a real-world crime IMHO.
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Old 01-14-2019, 09:31 AM   #15
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A few years back when gas peaked in price, a few boaters including one inshore charter guy claimed stolen gasoline (not little tanks).

And wanting a free tow wasnt really a good idea as much as we charged for a 5 gallon container.

Can't remember any diesel thefts through my boating years.
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Old 01-14-2019, 11:36 AM   #16
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Here's what you're looking for...
TANK LOCK - Home


They work exceptionally well, come in a variety of sizes, can be keyed alike so you only need to keep track of one key, they're flush mounted so no tripping hazard.


I have them on my boat and love 'em.
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Old 01-14-2019, 08:36 PM   #17
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A couple of years ago I had over 60 gallons of fuel pumped out of my boat while in storage at a marina in New Baltimore,NY. I got a couple of these Stanco GBB-01 Gas Bandit Blocker. It's a funnel shape spring that goes i9nto the filler hose.
I think the fuel theft might have been an inside job. Moved to a different marina right after I found out about it.
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Old 01-14-2019, 08:47 PM   #18
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My concern is not theft, but vandelism. Very easy for someone to dump some sugar or whatever in the tanks and wreak havoc.

The Tank Lock product is shown as gas, and doesn’t look all that robust in the photos.

Any other ideas?

Not sure I am concerned enough about doing anything about it, just curious what is out there.
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Old 01-15-2019, 05:32 AM   #19
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"Any other ideas?"

We removed the on deck fill , cut the hole area open to accept a 6 inch bronze deck plate .
We installed a pipe nipple in the cut down fill hose and installed a std plumbing cap.

Advantage , deck water rain or washing can not access the fuel tank.

Most thieves will not locate fuel fill , or have the proper wrench to remove the flush deck plate. Even if the deck plate is lost the cap does not allow water to enter the fuel fill pipe.

If its not walked on a budget plastic deck plate would work as well.
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Old 01-15-2019, 11:59 AM   #20
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The Tank Lock product is shown as gas, and doesn’t look all that robust in the photos.
Fletcher, I have them on my boat and they are very robust and well made. I have diesels and the threat of vandalism is the reason I did it.
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