1500 howling noise gas tank/cap ? - Steve Saunders Goldwing Forums

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post #1 of 7 (permalink) Old 10-12-2015, 10:42 AM Thread Starter
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1500 howling noise gas tank/cap ?

Hi all,

Last night after parking in the garage we heard a howling noise from what appeared from the engine area. I thought it was maybe coolant moving around at first. About 30 minutes later when I went back in garage it was still making the same noise, and there was an awful odor that I can't describe. After some searching it sounded like it was louder around the fuel cap area. As soon as I moved the fuel cap the noise began to change and after the cap was off the noise was totally gone.

We had just driven about 90 miles from the last fill and there was about a half tank of fuel left. Some sort of vapor lock?

Thoughts please.

Thanks,
Larry
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post #2 of 7 (permalink) Old 10-12-2015, 10:46 AM
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pretty much normal if you just came in off of a hot trip...

not to worry. it is just the fuel tank equalizing to atmospheric pressure.
the gas cap has a vent for that purpose.

~ John


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post #3 of 7 (permalink) Old 10-12-2015, 10:46 AM
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The rising heat from engine after shutdown expands the fuel causing some vent action
Try cleaning the cap by soaking in seafoam overnight, and verify the vent hole in rubber seal in lined up correctly

See the other recent threads on same subject for details on options for fix
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post #4 of 7 (permalink) Old 10-12-2015, 10:51 AM
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Originally Posted by Snowing View Post
Hi all,

Last night after parking in the garage we heard a howling noise from what appeared from the engine area. I thought it was maybe coolant moving around at first. About 30 minutes later when I went back in garage it was still making the same noise, and there was an awful odor that I can't describe. After some searching it sounded like it was louder around the fuel cap area. As soon as I moved the fuel cap the noise began to change and after the cap was off the noise was totally gone.

We had just driven about 90 miles from the last fill and there was about a half tank of fuel left. Some sort of vapor lock?

Thoughts please.

Thanks,
Larry
After a ride, my 1500 makes what can only describe as farting sounds. I have been poo-paahed on the forum here before for this amoung other odd things my 1500 does.

My evaluation is that there appears to be a reed valve in the gas cap somewhere that chatters somewhat as the pressures equalize.

When it happens I just "burp" the gas cap, it blows a final queef at me and that's that!
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post #5 of 7 (permalink) Old 10-12-2015, 10:55 AM
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a sickly sweet unusual smell is a coolant leak. A popular failure is the transfer hose from rad to res-
its in sections and a 90 fitting
The last piece has a built-on grommet to seal its penetration into the top of res bottle

That hose likes to break just above the grommet- a small break- enough to smell coolant on occasion and enough to allow coolant to go to the res bottle- but it CANT RETURN to refill the rad!

Ck rad level by removing cap- not trusting the res bottle dipstick in this case = it may be full or OVER-
that would be a clue~

good news is 8 dollars to Mother Honda gets a new hose with grommet.
Note Use HONDA car (good deal) or bike coolant (pricey!!!) or one that specifically says
CONTAINS NO SILICATES to top off rad,,
unless its been 2 years = then its time to do a cooling system drain/flush/refill
You have already removed the plastic pieces in the way on top, only 10 bucks of coolant and 20 minutes
to do the work.
The engine appreciates it!
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post #6 of 7 (permalink) Old 10-12-2015, 11:00 AM
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us385 see other thread on gas cap vent and rubber seals vent opening hole is properly oriented

Some drill out the hole for better venting and end the noise issue
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post #7 of 7 (permalink) Old 10-12-2015, 02:03 PM
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Quote:
Originally Posted by Aloha Tom View Post
The rising heat from engine after shutdown expands the fuel causing some vent action
Try cleaning the cap by soaking in seafoam overnight, and verify the vent hole in rubber seal in lined up correctly

See the other recent threads on same subject for details on options for fix
Once again there is nothing wrong with it, you can fix it until there is if you want.
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