Petcock vacuum?


Information and questions on GL1500 Goldwings (1988-2000)
  • Sponsored Links
Post Reply
hornetgod13
Posts: 4
Joined: Sat Apr 02, 2016 9:46 pm
Location: Olive Green, Ohio
Motorcycle: 1989 GL1500 Aspencade & 1995 GL1500 Aspencade

Petcock vacuum?

Post by hornetgod13 » Sun Apr 07, 2019 4:47 pm



I have troubleshot a fuel delivery problem down to the petcock vacuum. A new fuel pump, and a rebuilt petcock have not improved the problem. I did test the petcock after it was rebuilt. While manually sucking on the vacuum hose, it will open and allow fuel to pass however, on the motorcycle it will not. The vacuum hose is intact and free of blockage. It holds pressure if I pinch it however, if I blow in the vacuum line down through the intake vacuum metal lines when its un-pinched, it merely hisses and does not hold pressure. Is it common to have vacuum leaks effect petcock operation?



hornetgod13
Posts: 4
Joined: Sat Apr 02, 2016 9:46 pm
Location: Olive Green, Ohio
Motorcycle: 1989 GL1500 Aspencade & 1995 GL1500 Aspencade

Re: Petcock vacuum?

Post by hornetgod13 » Mon Apr 08, 2019 6:40 am

I realized the lack of petcock vacuum and blow back leak down was most likely due to the carbs being removed at the time of the test. Once everything is reassembled, I will test the petcock operation again.

hornetgod13
Posts: 4
Joined: Sat Apr 02, 2016 9:46 pm
Location: Olive Green, Ohio
Motorcycle: 1989 GL1500 Aspencade & 1995 GL1500 Aspencade

Re: Petcock vacuum?

Post by hornetgod13 » Mon Apr 08, 2019 6:12 pm

I found a pinched/colapsed vacuum line under the carb/black manifold mat. That line also had a hole melted in it. Replaced the line and reinstalled the carb. I have plenty of fuel flow from the petcock now.

User avatar
kane67
Posts: 286
Joined: Tue Aug 18, 2015 2:15 pm
Location: Vantaa, Finland
Motorcycle: Honda GL1500-88

Re: Petcock vacuum?

Post by kane67 » Mon Apr 08, 2019 11:39 pm

Hi,

Was it the ”orange” hose?
https://www.google.com/search?q=gl1500+ ... gU0VL4OjeM

Br, kane

hornetgod13
Posts: 4
Joined: Sat Apr 02, 2016 9:46 pm
Location: Olive Green, Ohio
Motorcycle: 1989 GL1500 Aspencade & 1995 GL1500 Aspencade

Re: Petcock vacuum?

Post by hornetgod13 » Tue Apr 09, 2019 12:13 am

Yes, it was the orange hose. Right at the 90 degree bend.
Attachments



User avatar
kane67
Posts: 286
Joined: Tue Aug 18, 2015 2:15 pm
Location: Vantaa, Finland
Motorcycle: Honda GL1500-88

Re: Petcock vacuum?

Post by kane67 » Tue Apr 09, 2019 2:52 pm

Ok, orange hose goes to ECU so a fresh good hose may improve engine behavior...

User avatar
Wing--Man
Posts: 20
Joined: Mon Jun 20, 2016 4:51 pm
Location: 60477
Motorcycle: Its-A-Wing--Man

Re: Petcock vacuum?

Post by Wing--Man » Wed Apr 10, 2019 1:53 pm

Hornetgod:
You will find a PIN HOLE right at the red arrow.
Either get a new one or NAPA has thicker wall hose by the foot. Tho you will need a longer piece than OEM for the extra loop.

Check the LARGE hose directly in front of the carburetor on the same side, you may find the same issue.



.
Attachments




It is good we have dreams, for if they were real, most would not be here.
Smile for yourself when you wake up, you have another fine day to live.

Post Reply