Question about 1977 Suzuki GS 750

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Fuel leak where fuel tube goes into carb.

I have a 1977 GS 750 Suzuki. The fuel started leaking where the fuel line goes into the carb. I can replace the line but wonder if there is another problem. I noticed once it started leaking it would not stop. Is the petcock supposed to send fuel continuously? I see there are two lines...one that goes to the filter and the one that goes to the carb. The leak was at the carb where the line attached to the nipple.

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Turn the petcock valve off and the flow should stop. If the fuel line is long enough, cut the broken line just above the break then re-attach to the nipple.

Posted on May 22, 2009

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Posted on Jan 02, 2017

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1 Answer

Why do i have to blow through the overflow tubes to get fuel into the cylinders to start my bike?


Hi, William and the usual suspects are:
1. Enrichner system plugged, not properly functioning or improperly operated.
2. Fuel overflow.
3. Restricted fuel supply.
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5. Inlet system air leak.
For more information about your issue please visit the websites below. Good luck and have a nice day.
https://www.tradebit.com/filesharing.php/search/0/1981+suzuki+gs+750+l

Aug 15, 2015 | 1981 Suzuki GS 750 L

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Still workin on my 1980 suzuki GS550 L. Inline 4 cylinder. My Problem is When I run the bike I have gas coming out of my overflow tube for the number 1 and number 2 carburetors but if I disconnect the...


Hi, Davescheier6 and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
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5. Worn or dirty inlet valve or seat.
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Apr 23, 2017 | 1980 Suzuki Gs 550 L

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Gas is leaking out of the fuel lines??????mis connected?


Sounds like you are talking about the over flow, or vent lines. These come from the carbs, and hang down toward the bottom of the engine. If you have fuel running out of one, it could be due to a float sticking in one of your carbs.

Sep 05, 2011 | 1981 Suzuki GS 750 L

2 Answers

Fuel runs out the the right vent tube and breather hole when the engine is running. Disconnect the vac line from fuel tank and no leak. Is the vac fuel pump overpresuring the system? 1982 Suzuki GS750


Most likely the diaphragm in the fuel tap has a hole in it .The way your fuel system works is that, when the bike cranks and starts it generates a vacuum in the inlet manifold, a pipe from the manifold goes to the fuel tap. The vacuum in the pipe pulls the diaphragm in the tap away from the holes in the tap ,letting fuel flow past the diaphragm and down into your carburetors ( gravity fed).
If there is a hole in the diaphragm the vacuum will **** fuel through the diaphragm and down the vacuum pipe flooding that cylinder and starving the others.
I hope this helps.

Mar 28, 2010 | 1981 Suzuki GS 750 L

2 Answers

1980 gs 1000 fuel petcock has two connections where do they go?


On the one that has two hoses does it still have an "Off" position? Usually petcocks that have two hoses, one goes to the carb vacuum, and the other is for a fuel supply for the engine. That way it only allows fuel to flow when the engine is running. I have found these to be a poor design and can often leak and allow fuel to run into the engine if your carbs are acting up. If the replacement only has one hose, then it will work fine, just be sure to cap off the vacuum port on the carb.

Sep 24, 2009 | 1978 Suzuki GS 750 E

1 Answer

1977 750gs carb sync


carb sync is done using only the carb hard stop adjustment u don't touch the air fuel mixture screw, had this exact same bike had the serive manual am dead sure on this

Aug 04, 2009 | 1977 Suzuki GS 750

2 Answers

Suzuki gs 750 getting a constant flow of fuel out of crank vent


The breather tube may warrant re-jetting but not re-syncing.

A “very helpful” rating for this answer? Thanks!

Jun 11, 2009 | 1977 Suzuki GS 750

1 Answer

Fuel leaking from bowls on Carb


is the leak coming from the overflow or just the seal around the bowls? if you take the bowls off (turn petrol off first) the floats may be getting caught open?

Jun 06, 2009 | 1978 Suzuki GS 750 E

1 Answer

Wont start


Hello;
If it starts with ether then you have spark, compression, and air. All you need is fuel. Make sure that you have fuel at the carbs and that the fuel is flowing to the cylinders. Check that the petcock is open and free of debris. Hope that helps;
Thanks;
Rich
RPM Northwest

May 19, 2009 | 1977 Suzuki GS 750

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