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Posted by chief
- August 11, 2013, 15:36:58 PMQuote from: greenbarn on August 09, 2013, 16:56:06 PMMy 1500 has always "hissed" when the tank is almost full and the weather is hot. That's the pressure relief "valve" in the cap. If you open the cap, it relieves the pressure and the hiss stops for a bit. I've never had a bit of a problem with my fuel system however.That reminds me, on hot days, I hear a hissing noise @ the cap. Seems like I'm more likely to hear it with a full tank. I never thought about it, but perhaps that's another sign the cap isn't venting.
I'll have to check out the vent and lines. ....or ride under 70MPH....
Opening the cap should relieve any venting problem... temporarily as well. That would indicate a problem with venting.
Posted by John Hopkins
- August 09, 2013, 17:10:56 PMI agree with those who said the tank vent needs looking at.
John.
Posted by greenbarn
- August 09, 2013, 16:56:06 PMThat reminds me, on hot days, I hear a hissing noise @ the cap. Seems like I'm more likely to hear it with a full tank. I never thought about it, but perhaps that's another sign the cap isn't venting.
I'll have to check out the vent and lines. ....or ride under 70MPH....
Posted by CDNRatMan
- August 09, 2013, 10:46:58 AMok makes me remember that I did some riding last summer after I bought the bike and never noticed anything about the tank or fuel cap. However over the winter, I did a lot of cleaning and messing about with the bike and I did clean the vent and around the fuel cap. This year on hot days and such I can hear the tank venting, which I never heard last year. So perhaps the vent is not allowing air in to let the fuel flow.
Posted by Troll
- August 09, 2013, 09:52:40 AMCheck the vent hose and the vent in the cap. I had my W-650 do that to me once. The vent hose was kinked, and the vacuum in the tank was enough to keep the fuel from flowing. The cap has an interesting pressure/vent system in it for emission purposes, and they can cause problems.
Posted by DKtime
- August 09, 2013, 09:31:49 AMThis exact thing happened to my wife on our way to Daytona earlier this year!!!
We normally don't ride the interstates but time constraints forced us to, in order to get where we wanted to be when we wanted to be there.
We were doing high seventies to low eighties for 77 miles, then her bike did just as you described. We stopped an refueled and it held less than 2 gallons. I thought as others posted trash got caught in the fuel line or the petcock screen got clogged ect. ect.
We decided to push on, the bike ran fine in the petcock run position for around 70 miles then it happened again, she switched to 'res' and again we stopped to refuel. When I opened the fuel cap there was a noticeable vac. pulled on the tank.
My theory is that the fuel cap vent cant supply air as fast as the fuel being used at those speeds, and turning the petcock past prime relieves enough vacuum to allow the fuel to flow again.
Just my theory, not a definitive answer....
Posted by waltervl
- August 09, 2013, 02:01:08 AMThus the air vent in the fuel cap work? When there is a vacuum in the tank this could happen perhaps?
Posted by 49Reo
- August 08, 2013, 21:53:41 PM 
The muffin is in the mail....
Posted by greenbarn
- August 08, 2013, 21:39:19 PMQuote from: CDNRatMan on August 08, 2013, 21:34:56 PMjust curious now, what do you normally ride at speed wise on both main or 4 lane and 2 lane roads.
I came back from my sister's and it is a 5 hour ride, all 2 lane highway, and I was pretty steady at 65 to 69 mph till the last 2 hours when the route becomes a major 2 lane highway and there I was running along at 68 to 72 mph. I never had any issues with the problem you are talking about. I have noticed a huge difference between using 90+ octane fuel and the 87 octane fuel, seem to get a lot more miles from the 91+ and so use that.
When I first bought my bike it seemed to run out of fuel faster then I thought it should so like 49 said I took the petcock apart and cleaned it and it was a bit gummed up and so cleaned it and cleaned the screen in there .
if he sends you some Saskatoon Muffins that might help
I usually ride 60 or so if I'm on a leisurely ride, or many times cruise at 65-70. This is probably the first time I've been cruising at a steady 70-75 for that long of a time.
There is no way I was out of gas - I only put 1.5 gallons in.
And I second the muffin idea. I think I'd feel a lot better if I could try one of those....
Posted by greenbarn
- August 08, 2013, 21:36:03 PMNo problems once I filled up - put it back on "on" (regular, non-reserve position) no issues.
And I had the tank off and cleaned it to a pristine condition over the winter, and switched the valve with a new one - the screen is on the valve, so it's new too. No trash in the tank.
Posted by CDNRatMan
- August 08, 2013, 21:34:56 PMjust curious now, what do you normally ride at speed wise on both main or 4 lane and 2 lane roads.
I came back from my sister's and it is a 5 hour ride, all 2 lane highway, and I was pretty steady at 65 to 69 mph till the last 2 hours when the route becomes a major 2 lane highway and there I was running along at 68 to 72 mph. I never had any issues with the problem you are talking about. I have noticed a huge difference between using 90+ octane fuel and the 87 octane fuel, seem to get a lot more miles from the 91+ and so use that.
When I first bought my bike it seemed to run out of fuel faster then I thought it should so like 49 said I took the petcock apart and cleaned it and it was a bit gummed up and so cleaned it and cleaned the screen in there .
if he sends you some Saskatoon Muffins that might help
Posted by 49Reo
- August 08, 2013, 21:31:22 PMPossibly the filter in the tank on the petcock got something on it, or something in the 'normal' side of the petcock? Sounds odd. Were you able to run on the 'tank' position after filling up? Pr did it still have to be on reserve?
Posted by greenbarn
- August 08, 2013, 20:55:25 PMWeirdest thing happened. I was on the way to Columbus last night to visit my Mother-in-law. I took the interstate to make better time, which I seldom do. After traveling about 13-14 miles at about 70-75 (faster than I usually ride) the bike "ran out of gas" so I instinctively switched to reserve. As soon as the petcock hit prime, it took off again, good to go. Problem is, I only had about 70 miles on that tank, and it only took a gallon and a half to fill it up. So how did it "run out of gas"?
Does anybody know of any common issues with fuel restrictions on these? Obviously I'll have to keep an eye on it. It didn't do anything the rest of the day, but I wasn't pushing it that hard again - went home on 2-lanes.
I can't believe I was using fuel faster than the petcock could deliver?
btw, this was a new oem petcock this winter.