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Old 05-09-2015, 04:01 PM   #1
Skoolie
 
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fuel filler cap

Are the filler caps supposed to be vented?

I am asking because my bus came with out the filler cap, I have it covered with a rag and tape and it is inside the door.
I was wondering if a regular pipe cap would work or if I need to go to a truck dealer to get a replacement.

thanks
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Old 05-09-2015, 10:35 PM   #2
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Mine are brass. You might be able to pick one up at a truck parts place.
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Old 05-09-2015, 10:54 PM   #3
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Quote:
Originally Posted by c_hasbeen View Post
Are the filler caps supposed to be vented?

I am asking because my bus came with out the filler cap, I have it covered with a rag and tape and it is inside the door.
I was wondering if a regular pipe cap would work or if I need to go to a truck dealer to get a replacement.

thanks
Your tank is most likely vented.
A pipe cap will work fine.
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Old 05-09-2015, 11:02 PM   #4
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Rated Cap: 11 window
my cap has real fine threads, not npt. be carefull not to ruin the threads with the wrong thread.
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Old 05-10-2015, 10:04 AM   #5
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yea these do actually look fine threads. I will go talk to them at kenworth on Tuesday
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Old 05-10-2015, 10:12 AM   #6
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I wish you lived closer. We have a ton of scrap buses. I could have given you a fuel filler cap.

Nat
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Old 05-10-2015, 11:40 AM   #7
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I wish you lived closer. We have a ton of scrap buses. I could have given you a fuel filler cap.

Nat

The funny thing is I called the guy who I bought this from because he said he had a bunch of old scrap buses but he would not go look for one.

I will find one close by, I am sure
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Old 05-10-2015, 09:23 PM   #8
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i stand corrected, my 96 thomas gas cap is 2" npt, no vent stamped on it.
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Old 05-10-2015, 09:42 PM   #9
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Short answer, some are and some are not vented.

Putting a vented cap on a tank that is vented can cause some issues.

Putting a non-vented cap on a tank that is not vented can cause other issues.

Just make sure you put the correct one on as it does make a difference.

Also be aware, some are male thread and some are female thread.
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Old 05-11-2015, 08:30 AM   #10
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crawl under bus and look at tank, see if there is a rubber line coming from top of tank and draped over the side, I have actually pressurized my tank to a couple pounds using a tapered plastic fitting for inner tubes and air mattresses, stuck in that vent hose when filling new filters and bleeding injector lines (do not over pressurize!!!)
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