Fuel not exiting petcock


Information and questions on GL1500 Goldwings (1988-2000)
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pdskip
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Fuel not exiting petcock

Post by pdskip »



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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Re: Petcock

Post by virgilmobile »

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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Re: Petcock

Post by WingAdmin »

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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Re: Fuel not exiting petcock

Post by pdskip »

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

Post by Mh434 »

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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Re: Fuel not exiting petcock

Post by pdskip »

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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Re: Fuel not exiting petcock

Post by RBGERSON »

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,
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WingAdmin
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Re: Fuel not exiting petcock

Post by WingAdmin »

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

Post by Mh434 »

I forgot to mention that... :shock:
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spiralout
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Re: Fuel not exiting petcock

Post by spiralout »

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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Re: Fuel not exiting petcock

Post by pdskip »

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
FM-USA
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Re: Fuel not exiting petcock

Post by FM-USA »

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.
.
heddenonin
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Re: Fuel not exiting petcock

Post by heddenonin »

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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Re: Fuel not exiting petcock

Post by FM-USA »

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.
whatusername
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Re: Fuel not exiting petcock

Post by whatusername »

Sorry to revive an old thread but i am havine issues with a gl i just purchased.. i get no fuel from petcock at cranking. i used a vacuum pump and tested the petcocok it hold vacuum at 200 mmhg like its supposed to.. if i crank while i have the pump on then fuel does come out so i know its a vac problem.. i followed it to the metel pipe it goes to by the lower left #5 plug.. i checked the hose all is good so now im lost.. also number 3 manifold runner has a nipple on top of it but no hose any idea what goes there?
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Re: Fuel not exiting petcock

Post by FM-USA »

whatusername wrote: Sat Sep 18, 2021 1:41 pm Sorry to revive an old thread but i am havine issues with a gl i just purchased.. i get no fuel from petcock at cranking. i used a vacuum pump and tested the petcocok it hold vacuum at 200 mmhg like its supposed to.. if i crank while i have the pump on then fuel does come out so i know its a vac problem.. i followed it to the metel pipe it goes to by the lower left #5 plug.. i checked the hose all is good so now im lost.. also number 3 manifold runner has a nipple on top of it but no hose any idea what goes there?
.


.
whatusername
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Re: Fuel not exiting petcock

Post by whatusername »

Yes that is the nipple. I don't have one on my 95 wing so I couldn't figure it out on this 90.
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Re: Fuel not exiting petcock

Post by FM-USA »

My 91 Interstate is capped off also. Unknown what it's for but as designers go, one part covers several models.
whatusername
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Re: Fuel not exiting petcock

Post by whatusername »

Ok thanks 4 that I capped it off too but I still have the no vacuum problem to the petcock
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Re: Fuel not exiting petcock

Post by FM-USA »

whatusername wrote: Sat Sep 18, 2021 11:22 pm Ok thanks 4 that I capped it off too but I still have the no vacuum problem to the petcock
While waiting for petcock kit to arrive, I bypassed that valve but always being aware
of it's always open' fuel to the carbs. The routing of that vac-line to the left bank 'T' really
doesn't rub on anything and it's away from high heat of the engine so deterioration is little
issue, still check it and the other 2 vac ends for issues.
One thing that's remotely possible, a spring while rebuilding/assembling the petcock
was placed on the wrong side of a diaphragm. Easy to do since there's few parts and
thinking... it's a, hold my beer, moment. I did it,.. without the beer.
OH!
That capped end could be used for a vac-gauge ;) or vac-initiated coffee maker. :lol:
whatusername
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Re: Fuel not exiting petcock

Post by whatusername »

I've checked the hose it runs into the metal pipe thing that has is good I've checked the #1,2,3 pink hoses and check valve and they are good. I would like to know where the vacuum comes from that is supplied to the petcock.
whatusername
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Re: Fuel not exiting petcock

Post by whatusername »

Ok I followed the metal pipe across as best as I could and I believe it goes like this the top rail goes to the pair solenoids middle rail is petcock vacuum and it goes to the vacuum ports where u sync the carb then continues on to the vacuum canister in the front. Now with bike running the sync port is pulling vacuum and its reaching the canister so why isn't it pulling from the petcock hose? To troubleshoot I put my vacuum pump on the line hose that goes to the sync port and it was holding pressure with petcock line off. To me that's weird because isn't it all just 1 connected piece of pipe? Maybe there's some kind of blockage from where the metal pipe starts to where it comes out to the sync port? Or is there something I'm missing? This is the pipe I'm referring to
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FM-USA
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Re: Fuel not exiting petcock

Post by FM-USA »

I thought that part you showed looked familiar...


.
Cruise Control cable.


whatusername
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Re: Fuel not exiting petcock

Post by whatusername »

Lol no the part is the triple copper pipe behind it.


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