fuel regulator vacuum test


Information and questions on GL1500 Goldwings (1988-2000)
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Gordwing
Posts: 81
Joined: Tue Jul 05, 2011 8:32 am
Location: Orangeville, ON
Motorcycle: 1992 GL1500 Aspencade

fuel regulator vacuum test

Postby Gordwing » Tue Oct 21, 2014 6:33 am



Hello. My troubleshooting a fuel problem continues. The manual says in testing the fuel regulator,to pump up the vacuum to 200mm and it should not bleed down. Does that mean never because it drops down to 100mm in about 30 minutes. Should the regulator be replaced?

Gordwing



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virgilmobile
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Re: fuel regulator vacuum test

Postby virgilmobile » Tue Oct 21, 2014 6:51 am

Its suppose to hold a vacuum.you do have a leak.Small one but still.
Small leaks can be the vacuum hose or the meter equipment.possibly where the diaphragm seals to the casting or a pinhole.
It depends on how you feel about it.30 minutes and still holding a vac is pretty good.
What problems are you trying to resolve?
If you suspect the valve,it can be temporarily bypassed.

Gordwing
Posts: 81
Joined: Tue Jul 05, 2011 8:32 am
Location: Orangeville, ON
Motorcycle: 1992 GL1500 Aspencade

Re: fuel regulator vacuum test

Postby Gordwing » Tue Oct 21, 2014 7:23 am

The biked bogged down repeatedly on the highway but would eventually start and idle forever but after I rode a few minutes with my wife and trailer it would bog down again.I changed the fuel filter and tested the fuel pump which is pumping 1 oz./second and now the fuel regulator vacuum. I don't want to ride it until I'm sure. I can't push it home.

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virgilmobile
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Joined: Sun Sep 19, 2010 5:39 pm
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: fuel regulator vacuum test

Postby virgilmobile » Tue Oct 21, 2014 7:55 am

The easiest test is a bypass of the valve to confirm its the problem.
The vacuum line that feeds it is also suspect.they harden right where they attach to the intake nipple.
There is the possibility of "trash" in the carbs too.They do have a drain.Tough to get to but I have had to blow mine out.I had a bit of water in them.
I opened the drain screw and nothing came out.I used compressed air into the breather tube to force it clear.

Gordwing
Posts: 81
Joined: Tue Jul 05, 2011 8:32 am
Location: Orangeville, ON
Motorcycle: 1992 GL1500 Aspencade

Re: fuel regulator vacuum test

Postby Gordwing » Tue Oct 21, 2014 8:01 am

Thank's for the advice. The bike is parked for the winter so I will do what you say and check it all out. Would it be worth taking the regulator apart? can it be rebuilt?

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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
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: fuel regulator vacuum test

Postby virgilmobile » Tue Oct 21, 2014 8:50 am

I think there is a diaphragm kit avaiable for them,use the search section.
Verify the valve itself if leaking before you tear it apart.
It can be removed from the bike and bench tested to see if its holding a vacuum.

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ct1500
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Re: fuel regulator vacuum test

Postby ct1500 » Tue Oct 21, 2014 7:43 pm

Holding a vacuum for that long is perfectly OK and not the cause of any running issue, a leaking diaphragm will bleed right down. You can now tee in a vacuum gauge to the supply line and monitor while running looking for loss or poor vacuum supply.


This is what I do
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