Author Topic: Need advice on a fuel problem  (Read 2172 times)

0 Members and 1 Guest are viewing this topic.

Royal Rick

  • Guest
  • Trade Count: (0)
Need advice on a fuel problem
« on: May 13, 2017, 09:00:10 PM »
Hi guys,

I picked up a '77 Suzuki GS400. It had a leaking fuel cock, so I bought a rebuild kit and the leak stopped. I got the bike running and everything was fine. I shut off the fuel cock, parked the bike in the garage and the next morning had a huge puddle of gas on the garage floor. Thinking the problem might be the carb bowl gaskets, I removed the bowls (full of gas) and ordered a new set. While waiting for the new gaskets to show up the bike continued to leak gas through the carbs.

I'm thinking this has to be a fuel cock issue but a guy at the Suzuki dealership said it was a carb float problem. I don't understand how the carb is getting gas if the fuel cock is in the off position.

Help!

Thanx so much. I know this is a Bridgestone forum but I can't seem to find a good Suzuki forum and you guys have always been great.

Offline hardy

  • Trade Count: (0)
  • Full Bridgestone Member
  • ***
  • Posts: 187
Re: Need advice on a fuel problem
« Reply #1 on: May 14, 2017, 01:54:25 AM »
I would agree with you, if you shut the fuel off, the only thing Fuel that can leak is what's left in the fuel hose.

You would need to remove the fuel hose and check the tap is still not leaking overnight.

Offline BRT-GTR

  • Brian
  • Trade Count: (0)
  • Master Registered Bridgestone Member
  • *****
  • Posts: 951
Re: Need advice on a fuel problem
« Reply #2 on: May 14, 2017, 02:52:08 PM »
     You have two issues :-

                 The overhauled fuel tap is still allowing fuel to pass to the carbs even when turned off.  Recheck internal seals
                 The carb needle valve(s) are not shutting off, either dirt/gum in the valves, worn needles/seats, puntured float or mechanical issue.
« Last Edit: May 14, 2017, 02:57:29 PM by BRT-GTR »
Unspoiled by progress.
I'm so glad I grew up in the 60s & 70s. I did so much stupid stuff and there's no record of it.............Anywhere !!

Royal Rick

  • Guest
  • Trade Count: (0)
Re: Need advice on a fuel problem
« Reply #3 on: May 14, 2017, 04:17:33 PM »
Thanks, guys. That makes sense.

Garry Haliburton

  • Guest
  • Trade Count: (0)
Re: Need advice on a fuel problem
« Reply #4 on: May 14, 2017, 09:18:43 PM »
Royal Rick, I had a 1977 GS750 it had a I believe to have a vacuum controlled fuel shut off. Didn't have to turn it off and on. No fuel gauge, but must of had a reserve can't remember. Is your GS400 like that? If not then the fuel cock should shut  off the gas to the carbs if working properly. Hop

Offline dcr

  • Trade Count: (0)
  • Expert Registered Bridgestone Member
  • ****
  • Posts: 459
Re: Need advice on a fuel problem
« Reply #5 on: May 15, 2017, 11:01:44 AM »
Pull the fuel line that runs from the fuel tap to the carb off the carb and with the petcock off, see if fuel is coming out of the fuel line. Put a bucket or other container under it and let it sit the night. If you come back in the morning and there is fuel in the container, you have your culprit.

Dan
1966 175 DT and 1968 350 GTR

 


Gallery


Views:218
Comments (0)
By: Jon West

Views:1360
Comments (0)
By: rwgibbon

Views:1689
Comments (0)
By: Perry L Anderson

Views:1755
Comments (0)
By: Perry L Anderson

Classifieds

Gto
Date: 03/02/2024 06:49 am
Time Left:
Looking for a BS90 used or new luggage Carrier assembly

Date: 02/01/2024 04:19 pm
Time Left:
Gto
Date: 10/19/2023 01:08 pm
Time Left:
Urgent - l/end roller bearing & piston pins needed
Date: 10/08/2023 03:25 am
Time Left:

Recent Downloads added

Chibi, Chibi Deluxe, Tora Service Manual
Rating: (None)
Filesize: 20383.27KB
Date: May 01, 2023, 08:35:39 PM
Chibi_Tora_Parts_Manual
Rating: (None)
Filesize: 14301.44KB
Date: May 01, 2023, 08:25:53 PM
BS200 Mk II RS & MK II SS Exclusive Parts
Rating: (None)
Filesize: 358.29KB
Date: March 07, 2021, 07:30:10 PM
1970 sales brochure
Rating: *****
Filesize: 6753.33KB
Date: July 16, 2020, 10:01:18 PM

Powered by EzPortal