Question about 1996 Suzuki GSX 750 F (Katana)

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My 1996 750 Katana runs but it will only run with

My 1996 750 Katana runs but it will only run with the fuel valve in the prime position. If I turn the valve to "on" or "reserve" the bike starves out.
When it is running (in the "PRI" position) it seems to be running really rich.

Any ideas?

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  • Suzuki Master
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You may need to rebuild the fuel tap with a new diaphram kit.

The fuel tap has a small rubber diaphram and plunger, which can go hard, stick closed , or wear out and get a hole.
Also check the vacumn hose than opperates the tap is in good condition
Pri bypasses the vacumn opperated fuel tap, sometimes this can cause the carbs to flood or have higher than normal float levels..
Running it on prime can also cause the carbs to flood fuel into the engine filling the sump, which then s ucks fuel vapour through the crank breather into the airbox, and then through the carbs causing over rich.
If this has happened you also need to change the oil and fit a new air filter element

Posted on Jul 17, 2010

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Is the tap vacuum operated? There will be a pipe from the carb to the tap if there is, and when the engine is running the vacuum from the carb pulls on a diaphragm and opens the flow.
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I turn ignition to ready position. The fuel pump engages and prime's the line. I then start the engine. Engine starts and runs for a max of 15 seconds. As soon as the engine cuts out the fuel pump...


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To clarify, the fuel pump is on all time during engine cranking, and during engine running. When the engine cuts off, the pump will also be stopped. But, you will not lose pressure in the fuel lines and fuel rail immediately. The check valve in the pump is supposed to hold fuel pressure in the system for a good time-about 20 minutes. The pressure should bleed off very slowly.

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