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lost fuel cap need help finding the right cap

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lost fuel cap need help finding the right cap

Old 06-13-2019, 05:34 PM
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Default lost fuel cap need help finding the right cap

So I lost my cap fueling and for know I am useing flex seal tap to keep water out of the tank and it seems to work well. I have purchased 3 caps and each one I use just don't fit. I measured it out and its 1 1/2 and I tried 3 diffrint caps that say they are 1 1/2. please can some one help here is a picture of the fuel whole.
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Old 06-13-2019, 08:34 PM
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You need 10 posts before you can add pics .

If the manufacturer of your boat is by by chance still in business , give them a call. What boat do you have???

If no joy there, use calipers to measure the ID of your deck fill fitting & add 2x the depth of the thread to get cap threaded portion OD. Measure height of the threaded portion up to the O-Ring and cap and jot that down and/or diagram. Use a thread pitch gauge to know exactly what pitch the threads are on the fill. Take the caliper & pitch gauge and the noted /diagrammed measurements to all the local boat supply/chandleries within~~ 50 mi and start comparing.

If /when you find a good fit , be sure to buy an extra for a spare to keep onboard. This will prevent you from ever losing another.

Or...... just replace the whole deck fill with a new one with its matching cap
If you lost the cap at a fuel dock. go back there ,put on a mask and jump in after-hours. You may have a choice of a wide variety of caps and deck keys down there.
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Old 06-14-2019, 04:57 AM
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the boat is a 2001 May Craft. Thanks for all that info I guess ill be store hoping this weekend. is it diffucult to change the whole deck fill? again thanks for your help greatly appreciate it
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Old 06-14-2019, 05:10 AM
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Difficulty in my eyes depends mainly on ease of access to where the fill meets the deck from below. If access is decent and you are handy - it isn't difficult. The next for me would be the condition of the fill hose - does it need to be replaced? If so, do you have access to the fitting on the tank?
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Old 06-14-2019, 05:23 AM
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thanks for the advice I guess I have some home work to do this weekend happy father days!!
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Old 06-14-2019, 07:35 PM
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Originally Posted by seamonster87 View Post
the boat is a 2001 May Craft. Thanks for all that info I guess ill be store hoping this weekend. is it difficult to change the whole deck fill? again thanks for your help greatly appreciate it
"Depends" . If you can find a replacement deck fill with the same fastener hole pattern you are 1/2 way there but that is not crucial.
Also , if there is not enough slack in the fill hose, you need to have access to that hose's attachment point on the tank to temporarily disconnect there.
If the hose looks at all "iffy" replace with new USCG approved fill hose with recent date on it.
Pull a new one into place with the old one but avoid leaving enough length so it develops a dip holding fuel.( Same with vent hoses.)

Of course use bedding compound, perhaps LifeCalk or LifeSeal?

Last edited by TTaxi; 06-14-2019 at 07:45 PM.
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Old 06-15-2019, 03:54 AM
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Manufacturer of the fill fitting should be stamped on it somewhere.
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Old 06-15-2019, 06:13 PM
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Just want to say thanks to every one for there info. I went on a journey searching for gas caps with my calipers in hand and in that I ended up helping a friend with his boat project and lucky me he remembered he saved his gas caps from his last boat project and it ended up being a perfect mach.
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Old 06-15-2019, 07:44 PM
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Oh no, that not fair - too easy !

That's great. Keep that spare onboard so you won't ever lose either.
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