Fuel not exiting petcock


Information and questions on GL1500 Goldwings (1988-2000)
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pdskip
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Location: Selah, Washington
Motorcycle: 1993 GL1500SE

Fuel not exiting petcock

Postby pdskip » Thu Feb 18, 2016 1:17 pm



Have been doing complete maintenance work on my 93 GL 1500SE...One item of maintenance was to rebuild the petcock..I also changed plugs, air cleaner, oil, etc. The first thing I did was to rebuild the petcock as suggested in other forums..When completed with the petcock, I started the bike several times and it ran perfectly (like it did before I started maintenance) I did the other maintenance and started it periodically, no problems...Put the bike all back together, and it would not start..turns over good..........Troubleshooted the gas line from the tank and learned gas is reaching the petcock but not exiting the petcock which I guess is obviously why it won't start. My questions are: what happened, and I assume the small black hose on the bottom left of the petcock is a vacuum hose? and where does it go? maybe became disconnected? thank you


Last edited by pdskip on Thu Feb 18, 2016 1:40 pm, edited 1 time in total.

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virgilmobile
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Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Petcock

Postby virgilmobile » Thu Feb 18, 2016 1:23 pm

I believe it ends up at the left rear intake runner.It may also have a "T" inline.

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WingAdmin
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2007 Aspen Sentry Trailer

Re: Petcock

Postby WingAdmin » Thu Feb 18, 2016 1:25 pm

The small diameter black hose connects onto the back side of the petcock:

GL1500 Petcock
GL1500 Petcock


It is a vacuum line. When the engine is cranking/running, vacuum is applied to the back side of the petcock, which moves the diaphragm to the rear, opening the fuel valve.

If this hose is not connected, not only will the engine not get any fuel, the engine will barely (if at all) run, because you have a massive vacuum leak of air going into that hose.

pdskip
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Joined: Thu Feb 18, 2016 12:59 pm
Location: Selah, Washington
Motorcycle: 1993 GL1500SE

Re: Fuel not exiting petcock

Postby pdskip » Thu Feb 18, 2016 1:44 pm

I do not know where left rear intake runner is. How do I access that to see if the vacuum line has become disconnected?
Last edited by pdskip on Thu Feb 18, 2016 2:24 pm, edited 1 time in total.

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Mh434
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Re: Fuel not exiting petcock

Postby Mh434 » Thu Feb 18, 2016 2:24 pm

I'd remove the vacuum line, plug it (so there's no vacuum leak at the engine), then, using another piece of tubing connected to the petcock, suck on it while cranking the engine. If it starts, there's a problem with the vacuum line between the petcock & engine. If it doesn't (and fuel still doesn't flow), the petcock is the problem.

pdskip
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Motorcycle: 1993 GL1500SE

Re: Fuel not exiting petcock

Postby pdskip » Thu Feb 18, 2016 4:08 pm

Thank you Mh434.. I gave that a try and still no fuel. It makes sense that it is the petcock because that is the only thing I changed other than routine maintenance...I believe I will start looking for a new petcock and not mess with the rebuild I did, or a new rebuild...Don't want to keep messing with it.

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RBGERSON
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had every year from 75 to 83

Re: Fuel not exiting petcock

Postby RBGERSON » Thu Feb 18, 2016 4:36 pm

Hard to see where it hooks up to the vacuum port but here's a pic



If you take off the left side covers and look below the cruise canister it's just above the #5 spark plug wires there is a metal tube sticking up back in there and the #12 hose on it. Youi have to get down low and kind of look up into that area.

Note you can bypass the peacock just to be sure that's your problem.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

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WingAdmin
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Re: Fuel not exiting petcock

Postby WingAdmin » Thu Feb 18, 2016 4:41 pm

Keep in mind that if the petcock diaphragm has failed, and you do the "suck on the tube" test to try to trigger it, you will end up with a mouthful of gasoline!

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Mh434
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Re: Fuel not exiting petcock

Postby Mh434 » Thu Feb 18, 2016 5:06 pm

I forgot to mention that... :shock:

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spiralout
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Re: Fuel not exiting petcock

Postby spiralout » Thu Feb 18, 2016 7:58 pm

pdskip wrote:Thank you Mh434.. I gave that a try and still no fuel. It makes sense that it is the petcock because that is the only thing I changed other than routine maintenance...I believe I will start looking for a new petcock and not mess with the rebuild I did, or a new rebuild...Don't want to keep messing with it.

Did the petcock hold vacuum when you did that?
Sounds to me like you rebuilt it incorrectly and the times you started it afterwards you were running on the fuel still in the bowls. There's not much that can go wrong with the petcock besides the rubbers you replaced and no reason to order a new one if the body of the existing one is ok.

pdskip
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Joined: Thu Feb 18, 2016 12:59 pm
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Motorcycle: 1993 GL1500SE

Re: Fuel not exiting petcock

Postby pdskip » Thu Feb 18, 2016 8:15 pm

Well, most recently I crudely bypassed the petcock and the bike started. I then hooked hoses back onto the petcock and it started and ran fine...I ran it for several minutes (fans came on) (little too cold here to actually ride). Regarding starting it earlier, I started it several times and ran it several minutes like I did today, so it just wasn't running on the fuel in the bowls. I am not sure what I did, but will start again tomorrow and see what happens. thanks everyone

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FM-USA
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Re: Fuel not exiting petcock

Postby FM-USA » Fri Feb 19, 2016 1:11 am

IF you're on the road and it cuts out, you now know how to bypass it to keep going.
In your tool bag/box should be a couple of wood Golf T's just in case you need to plug off a vacuum line or two. The plastic T's can melt.
.
"OIL CHANGE?" _FM 07-2009
Know its new taste and be loyal, you'll know when to change that oil.
Taste testing as the miles flow, souring as that acid grows.
And don't flirt with dirt or darkened oil, all the faster your engine will spoil.

heddenonin
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Re: Fuel not exiting petcock

Postby heddenonin » Wed Jun 01, 2016 9:16 am

Sorry FM-USA for hijacking your post. I'm having a similar issue with my 2000 GL1500SE. However, my bike starts up fine and runs for approx. 1-2 seconds and shuts back off. I can do this repeatedly.

When the petcock fails, is it a black and white failure...meaning does it either work or not work? Is it possible that partial vacuum would be sufficient to allow small amounts of fuel to the carbs and allow the bike to initially start?

My initial issue was the bike would idle....sometimes a bit rough. But when I would attempt to walk the throttle up, it dies immediately. I can restart this and have the same issue over and over. I did replace the fuel filter and air filter. That's when the issue changed a bit.

Now, when it starts, it sound good for 1-2 seconds then shuts back off.

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FM-USA
Posts: 2005
Joined: Wed May 18, 2011 8:40 am
Location: USA-ILL-60085
Motorcycle: .
'91 GL1500-I (Dbl-Darkside)
Acquired:__51K_Jun_??/2007
MADE_IT!_200K_Oct_17/2016
iRide 24/365 99% SmileMiles
================
"You don't buy yourself a
HD to be SATISFIED,...
you buy it to keep your
HD friends PACIFIED."
================
|
ANTAGONISTS need not post.
|
==================

Re: Fuel not exiting petcock

Postby FM-USA » Wed Jun 01, 2016 1:51 pm

heddenonin wrote:Sorry FM-USA for hijacking your post. I'm having a similar issue with my 2000 GL1500SE. However, my bike starts up fine and runs for approx. 1-2 seconds and shuts back off. I can do this repeatedly.

When the petcock fails, is it a black and white failure...meaning does it either work or not work? Is it possible that partial vacuum would be sufficient to allow small amounts of fuel to the carbs and allow the bike to initially start?

My initial issue was the bike would idle....sometimes a bit rough. But when I would attempt to walk the throttle up, it dies immediately. I can restart this and have the same issue over and over. I did replace the fuel filter and air filter. That's when the issue changed a bit.

Now, when it starts, it sound good for 1-2 seconds then shuts back off.

hijacking? Naaaa... no problem.

Most don't have a mechanical vacuum tool, YOU do.
The petcock has 3 rubber lines. 2 large (fuel) one small (vacuum).
Motor off.
Pull the small line off the left intake bank that goes to the Petcock. (just in front of rear intake)
Pull vacuum via mouth, clean it, then use your mouth to pull vacuum and plug hole with tongue to hold said vacuum.
Vacuum YES? The line and Petcock is good.
Vacuum slow loss, either faulty hose or bad Petcock connection.
Taste or smell fuel? Petcock is leaking, needs repair.


"OIL CHANGE?" _FM 07-2009
Know its new taste and be loyal, you'll know when to change that oil.
Taste testing as the miles flow, souring as that acid grows.
And don't flirt with dirt or darkened oil, all the faster your engine will spoil.


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