Weird Fuel issue


Information and questions on GL1000 Goldwings (1975-1979)
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jazza
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Motorcycle: 1978 GL1000

Weird Fuel issue

Postby jazza » Tue Aug 23, 2011 7:49 pm



I have a 78 GL1000.

I will be riding along and the bike will start to die (just loosing power and not responding to the throttle). So I turn the petcock from on to reserve. It will pick back up again for a little bit and then does the same thing...so I turn it from reserve to on and it picks back up. As long as every time it starts to loose power I turn the petcock the other direction I get my power back for a little bit.

It doesn't matter how much gas I have in the tank. Right now it's full and still doing it.

At this moment I am draining the fuel from the tank. I get a "little" flow when in the on position (fuel cap off). But no flow at all when switched to reserve. Should I be getting a "good" flow when on. And why am I not getting any flow when on reserve.

Any ideas?


1978 Wing Nut in a 2011 type of world!

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jazza
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Re: Weird Fuel issue

Postby jazza » Tue Aug 23, 2011 9:12 pm

I blew into the fuel line when in the on position to see if that would maybe unclog something and speed up the flow...no change.

I turned the petcock to reserve and blew..and blew...and blew...but only a small amount of air (very very small) went through and still no gas flow....I think I hurt my ears blowing so hard...something is stopping the flow for the reserve line for sure..

I took the petcock off and air flows through it fine both directions...so must be something in the line maybe.

So what could all this mean I wonder?
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virgilmobile
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Re: Weird Fuel issue

Postby virgilmobile » Wed Aug 24, 2011 7:43 am

The back side of the petcock has 2 microscreen filters(easily damaged) pull it and fix.

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scotterichmond
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Re: Weird Fuel issue

Postby scotterichmond » Wed Aug 24, 2011 9:48 am

Here is a link to a free copy of the shop manual. In the fuel section is a diagram of the fuel tank, I think will be most helpful.

http://www.gl1000.info/Manual.shtml

I believe you are plugged up. The trick is to figure out where.
When I take my fuel line off going to the fuel pump, and the tank valve is on ( in either position) fuel flows freely.

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Re: Weird Fuel issue

Postby thrasherg » Wed Aug 24, 2011 10:03 am

I would be concerned about either blocked screens/filters in the fuel line, or water in the gas tank.. I would drain the gas tank and use the gas for a lawn mower or some other garden tool, whilst the tank is empty, remove the fuel tap and check the screens and replace the fuel filter, then refill the tank with fresh gas and see if it cures your problem. Also check that the tank breather is working..

Gary

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Re: Weird Fuel issue

Postby dingdong » Wed Aug 24, 2011 10:24 am

After you take the pet-cock off run a length of something flexible through both tubes. A good thing to use is an old piece of throttle or choke cable.
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

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jazza
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Re: Weird Fuel issue

Postby jazza » Wed Aug 24, 2011 10:26 pm

Good idea about the throttle cable to clean out the tubes "dingdong".

After 1 hour of work I have the seat off and have a good view inside the tank through where the float unit attaches. Very rusted out!!! The filter on the end of tube is very rusted and I think this is the cause of my low fuel flow and non existent fuel flow for the reserve.

Anybody know of anything that would clean the inside of the tank and get rid of the rust. Preferably without removing the tank. I know that distilled water and sand will work if you shake the tank around...I was looking more for a chemical product.

On a side note...I noticed while taking the bike apart that one Carburetor assembly cover has a broken part (the top cover part) and so has a hole that lets in air...would this have an effect on the running of the bike to?...yes I'm a newbie! But this bike is certainly getting me knowledgeable.
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scotterichmond
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Re: Weird Fuel issue

Postby scotterichmond » Thu Aug 25, 2011 9:59 am

Here is some advice from one who has been there done that,. TAKE THE TANK OUT !
put some water in it and a hand full of 3/8 " nuts. shake it up ... alot !
then rinse,rinse,rinse. blow lots of air get it dry. If it is clean then seal it with a gas tank sealer from NAPA or somewhere else. follow therir directions.

The carb "dome" is critical. get another one from the same carb model. then it MUST fit right. the piston inside should slide freely but not be loose. Or better yet just get another complete carb.

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jazza
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Re: Weird Fuel issue

Postby jazza » Thu Aug 25, 2011 10:54 am

Thanks. scotterichmond

I will follow your advice on the tank cleaning. I was leaning that way....I still have to figure out how to get it out. I only see one bolt for the gas tank (on top at the rear) and it is still in there pretty tight. I guess I'll look at the service manual and parts catalog to figure that one out....unless someone knows and can tell me.

Thanks for the advice on the carb dome. I'll look into that too.

I love this bike and am ready to have it running right. It was sitting up for a year when I purchased it...It wouldn't start to begin with...I've been working on it for 4 months on and off. Almost there I think. Then time to polish the chrome and get it out on the open road.
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Re: Weird Fuel issue

Postby WingAdmin » Thu Aug 25, 2011 1:35 pm

You might want to check the gas cap as well. Next time you're out riding, when the bike starts to stumble, open the gas cap and see if it comes back to life. If so, the vent in your gas cap is blocked, and that's your culprit.

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Fred Camper
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Re: Weird Fuel issue

Postby Fred Camper » Thu Aug 25, 2011 9:30 pm

I agree on the cap, not that common but it does clog as well on an older bike. A good thing to try. Lots of pro and con to coating a tank. Cleaning is fine, but coating needs careful consideration. Good write up over at Randakks;

http://www.randakks.com/TechTip57.htm

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dingdong
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Re: Weird Fuel issue

Postby dingdong » Fri Aug 26, 2011 9:40 am

If by cover cap you mean the plastic (plug) at the top of the C/V slide cap, depending on how bad the hole is, you can just epoxy over the hole. You have to be careful though because there is an air hole inside that can be blocked if you get too much of the epoxy in there. Use just enough to cover the hole. If the hole is very big you can epoxy something over the hole to cover it. I have seen guys epoxy a nickel on top of the hole.
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

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jazza
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Re: Weird Fuel issue

Postby jazza » Fri Aug 26, 2011 2:25 pm

Got the tank off...this has to be done by removing the rear wheel and some other things like the seat...who knew!

Used my $20 power washer jet from walmart and blew a lot of the rust out of the tank...worked great.

Used some twisted power trimmer line to clean out the internal gas tank fuel line. Worked well for the 'on' line. Have water flowing out it really well now...but the reserve line is still blocked.

Will tackle the carb vacuum cover later.
I think I might clean the carbs while I have most of the bike apart and give the whole bike a good cleaning.
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Fred Camper
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Re: Weird Fuel issue

Postby Fred Camper » Fri Aug 26, 2011 8:21 pm

I would just do the fuel supply like you said and save rthe carbs for the off season.

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Re: Weird Fuel issue

Postby kirbb9 » Thu Sep 15, 2011 1:54 am

Get an old inner cable (clutch or front brake) and open up the ends enough
to create a wire brush. Chuck it up in your drill and it should open up the reserve
line.

Brady

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Fred Camper
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Re: Weird Fuel issue

Postby Fred Camper » Thu Sep 15, 2011 8:13 pm

Even a pedal bike cable will work for that, what every cable you can find easy.




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