petcock leaking


Information and questions on GL1500 Goldwings (1988-2000)
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RBGERSON
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Motorcycle: 98 SE GL 1500
had every year from 75 to 83

petcock leaking

Postby RBGERSON » Sat Jul 18, 2015 5:51 pm



I just noticed I have a small amount of fuel in the collection tray. I am assuming my petcock is leaking. I have no issues with acceleration so I am assuming the diaphragm is OK. So is there a gasket between the top and the base of the petcock..I didn't see one in any of the rebuild kits I looked at. Or is there a weep hole in the petcock that weeps when the diaphragm is leaking???

Guess it could be a line leaking too..hard to see where it's coming from...


HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

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ct1500
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Re: petcock leaking

Postby ct1500 » Sat Jul 18, 2015 10:46 pm

Between the two halves of valve is a center spacer plate with weep hole underneath. There are two rubbers in valve one for vacuum and the other is the actual stopper of fuel flow. If the stopper rubber is worn, torn, etc. any leaking fuel goes out the weep hole into tray.

The lines can leak also put regular hose clamps on them.
This is what I do
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RBGERSON
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Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: petcock leaking

Postby RBGERSON » Sun Jul 19, 2015 8:57 am

Thanks I guess I'll be ordering a rebuild kit.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

tprender
Posts: 188
Joined: Wed Mar 23, 2011 9:11 pm
Location: St Louis, Mo
Motorcycle: 1986 gl1200
1995 GL1500SE

Re: petcock leaking

Postby tprender » Sun Jul 19, 2015 11:46 am

Just watched a youtube from Show Chrome on rebuilding the petcock, looked simple. Not sure if there is one here in the how-to articles, might be.

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RBGERSON
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had every year from 75 to 83

Re: petcock leaking

Postby RBGERSON » Mon Jul 20, 2015 12:38 pm

Read somewhere in another thread you can eliminate the petcock and just connect the two lines together with a tube/barbed connector etc...and either leave the vacuum line on the petcock or plug it. To be fair it said while waiting for a rebuild kit to arrive..but if it works w/o the petcock????

So what's the down side to doing that?

I assume Honda had a reason to install a vacuum activated petcock??
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: petcock leaking

Postby WingAdmin » Mon Jul 20, 2015 1:18 pm

RBGERSON wrote:Read somewhere in another thread you can eliminate the petcock and just connect the two lines together with a tube/barbed connector etc...and either leave the vacuum line on the petcock or plug it. To be fair it said while waiting for a rebuild kit to arrive..but if it works w/o the petcock????

So what's the down side to doing that?

I assume Honda had a reason to install a vacuum activated petcock??


The downside is the same reason you shouldn't leave the petcock turned on when not riding a bike with a manual petcock: if one of the carburetor float valve leaks, just a tiny bit, it will drip gas down into the cylinder as the bike sits and fill it up, hydrolocking the engine. This can bend connecting rods and burn out starters when you try to start the engine, not to mention gas-washing the cylinder walls and causing wear.

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RBGERSON
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Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: petcock leaking

Postby RBGERSON » Mon Jul 20, 2015 6:38 pm

Seems like on a 1500 the fuel lines, petcock and carbs are higher than the highest point in the gas tank and way above the pickup on the pump end; w/o the pump working..could it still siphon..up hill??? While on a 1000 or 1100 with a full tank it's a down hill run to the pump and carbs.

Or am I just being fooled by the bikes design???
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

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made2care
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1997 Honda goldwing SE 1500 - AKA "Black Beard" (current)
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Re: petcock leaking

Postby made2care » Thu Jul 23, 2015 8:11 pm

i just purchased a 97 gl 1500 and have not looked or even noticed a petcock. Is there one I have to manually turn off when not riding?

tprender
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Location: St Louis, Mo
Motorcycle: 1986 gl1200
1995 GL1500SE

Re: petcock leaking

Postby tprender » Thu Jul 23, 2015 9:51 pm

There is no manual shut-off on the 1500. This is a vacumn open when the engine is running from what I have been reading the last few days. I would think that the shutoff is needed when the bike is not running to keep the gas from flooding the engine. All of the time that you siphon, the hose will be higher at some point than where the liquid is coming from and to where it is going.
I just went and ordered a rebuild kit from Cyclemax for my '95 yesterday. Saw gas in the overflow tray the last 2 days that that I have been riding. Did read that the last few years the petcock is a different size than the first years. So, make sure that the parts are correct before you open the bag. K&L does have 2 different units for the 1500.

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AZgl1800
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Re: petcock leaking

Postby AZgl1800 » Fri Jul 24, 2015 7:15 am

On the 1500, the vacuum petcock shut off valve is located directly in front of the fuel tank cap.
it has a fuel line to the left and the right of it.
it also has a vacuum line to the rear of it.

take it out, and you risk hydrolocking the engine when it is parked on the sidestand, or when it goes to sleep and the BAS has shut off the engine....
John
'02 Gl1800 Hot Rod Yellow,
daughter named her Big Bird :lol:
http://www.goldwingfacts.com

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RBGERSON
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Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: petcock leaking

Postby RBGERSON » Fri Jul 24, 2015 8:41 am

Ok got the kit and replaced it all's fine now. Some observations..first the hardest part was replacing the seat damn bolts hard to line up. Second getting the lines of the petcock a PITA..so I left them on, unscrewed the four bolts on the petcock while holding the face on so the spring wouldn't pop out.

Note you do this change w/o removing the seat or top shelter. Three of the bolts are very easy to get to and the fourth can be reached if one lifts up on the petcock a bit, it's just held in place by the fuel lines and the "hooks' on the mounting bracket. Too late for me but the rest of you try it before removing the seat and shleter top..worst case..you'll end up taking the shelter and seat off. when you do it"my' way the back piece the one with the fuel lines attached stays in the bike..front comes off in your hand and all the stuff to replace is on it..a ten minute job..and hour if you take the seat and shelter off..if you are lucky and your seat bolt line up quickly!!! Loosen the two bottom bolts first then the top two while keeping your thumb on the front to keep the assembly together until you are ready to remove it.


HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB


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