Replacement Gas Cap - help needed

[hightide185]

Unfortunately the chain broke on my gas cap and it is now lost. I am having a hard time finding a replacement that fits. The threads are roughly 1 3/4” across. I see lots of 1 1/2” but cannot find anything larger.

does any one have any ideas on where I can go?

 

[alldodge]

Might help i you post a pic of what's left so we might be able to guess-tamate. The other side is to get a entire new fill

 

[airshot]

Unfortunately the chain broke on my gas cap and it is now lost. I am having a hard time finding a replacement that fits. The threads are roughly 1 3/4” across. I see lots of 1 1/2” but cannot find anything larger.

does any one have any ideas on where I can go?

Certain types of threads are measured by the size pipe or tube inside diameter. It is possible that the 1 1/2" cap is really the same as your 1 3/4" cap. Not sure what type of threads are used on fuel caps....You might have to buy and try, to figure it out..

 

[hightide185]

The 1 1/2” is too smal. It fits inside the exiting threaded filler tube. I simply measured the cap that does fit but I am struggling to fit a replacement

 

[hightide185]

Might help i you post a pic of what's left so we might be able to guess-tamate. The other side is to get a entire new fill

I can get a pic of the filler tube this weekend

 

[alldodge]

I can get a pic of the filler tube this weekend

And put a measuring tape or ruler across it when taking the pic for reference

 

[airshot]

Is there a brand name on any part of the fill neck? Like Perko. etc.

 

[Scott Danforth]

since none of the deck fills are standardized, you will most likely be buying a new deck fill and not just the cap.

 

[hightide185]

Is there a brand name on any part of the fill neck? Like Perko. etc.

I can seem to any markings, how hard is it to replace the neck? I’ll have to check that

 

[JimS123]

I replaced gas caps twice in past years. I simply perused several boat fitting catalogs until I found the same one.

 

[dingbat]

The 1 1/2” is too smal. It fits inside the exiting threaded filler tube. I simply measured the cap that does fit but I am struggling to fit a replacement

Measure the root diameter (bottom of threads) to determine "size"
1.5" and 2" are standard

PERKO Inc.

PERKO Inc. - An manufacturer of marine hardware and accessories.

www.perko.com

 

[hightide185]

Here is the latest update. I did find one that fit (Attwood) and did see that my filler is a Perko. Here are some pics but I think I now know the correct size needed.

 

[JimS123]

You said it didn't have markings. Its clearly a Perko. Its also the one that I had to replace because they don't hold up well.

Whatever you do, don't use an Attwood cap (if that's the metal one in your pics) because you'll destroy the threads.

The Perko replacement is plastic and that's what you want.

They have an online catalog and you can get the part number from there.

 

[hightide185]

Sorry I missed it said Perko. Tough crowd. Just looking for some help. There is only one in the Perko Catalog that will work. I’ll order that one

 

[hightide185]

I called Perko this morning and got the correct Part Number based off our filler.

 

[JimS123]

Perko Spare Cap f/1313 Gas Fill

Spare Cap f/1313 Gas FillNon-Locking Spare Cap f/1313 Gas Fill

www.iboats.com

 

[airshot]

Being plastic the gas will dry the plastic out making the cap hard to thread, this makes it harder to turn, people add more force and they break !!! Keep the threads coated with a little silicone grease to keep the plastic from sticking and becomming tight.

 

[hightide185]

Being plastic the gas will dry the plastic out making the cap hard to thread, this makes it harder to turn, people add more force and they break !!! Keep the threads coated with a little silicone grease to keep the plastic from sticking and becomming tight.

Thanks, good tip

 

[JimS123]

Being plastic the gas will dry the plastic out making the cap hard to thread, this makes it harder to turn, people add more force and they break !!! Keep the threads coated with a little silicone grease to keep the plastic from sticking and becomming tight.

I used that very cap for 35 years. Only needed to replace it twice. Silicone is a good idea, but its really not that fragile.

 

[airshot]

Over the years I have saw many with channel lock pliers trying to get their plastic caps loose. Only to break off the tabs so there was nothing left to grab. The boat I just purchased has a plastic fuel inlet, andbit was a bit sticky getting the cap out....after a thin coat of Dow111 grease it is very smooth, dont need any tools to put it in or out.