Question about 1997 Suzuki GSF 1200 Bandit S

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Hi, On the fuel tap what is the Prime position function.

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You have a vacuum operated fuel tap. It should have 'on' , 'res' and 'prime'.
In the prime position fuel will always flow from the tank. In the other positions the engine must be running to allow fuel to flow. If the bike has been standing for a few days, fuel will evaporate from the carbs and the bike can be difficult to start. By switching to prime for a minute, the carbs are replenished and starting should be easy. Dont forget to return the tap to on or reserve once started.

Posted on Sep 06, 2010

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The petcock valve on the Bigboy TSR 250. What position must the valve handle be when driving. Please explain the 3 positions on the valve.


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.
If this is the case, the 3 positions are "PRIME", "MAIN" and "RESERVE".
Disconnect the pipe from the outlet of the tap, but be prepared for fuel to come out. If it does, then the tap is set in the prime position so move it to another setting to stop it. If it doesn't start flowing then the tap is set to main or reserve.
Main and reserve are self explanatory and are standard on most bikes, but prime is not on as many. Never ride on prime as this just allows fuel to flow freely and is only used to start a long standing bike or one that has been run to empty. It does what it says and primes the carb. Once running switch over immediately to main or reserve.

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Which way to turn the reserve tank switch on


There are 3 positions (as you probably know). Reserve, on and prime. Under normal conditions with a properly working fuel tap, prime is the by-pass that allows fuel to flow through without the engine running. On and reserve will only allow fuel to pass when the engine is running (uses vacuum from the carb).
  • PRIME has the handle facing down
  • ON is when it is facing the front
  • RESERVE when it faces the rear.
Do not leave the tap in the prime position EVER as this allows the fuel to fill the carb and with the engine running or attempting to start will cause hydrolock that will bend the pistons con-rods. Only use it to fill the carb with fuel and turn it to on or reserve as soon as you can.
If the bike runs using the prime position but will not run when on or reserve, then you may have a vacuum problem or a dodgy tap......assuming you have fuel that is.
Hope that helps.

Sep 14, 2015 | kawasaki KLE 500 Motorcycles

1 Answer

There is no off position on the fuel tap on xjr1300


Hi, Stephen PRI means prime, for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $ you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Fuel Tap Workshop Help
vacuum fuel tap
Yamaha XJR1300 2007 Service Manual
OEM parts for Yamaha
Yamaha XJR1300 Owner Manual

Apr 14, 2013 | 1999 Yamaha XJR 1300

1 Answer

I have a 78 650 Yamaha what position is off on the pit-****. I see res, on and pri


Hi, there is no off position on this tap, it is vachume opperated which means no fuel will flow from the tap in either the on or reserve position unles the engine is being turned over, so removing the fuel pipes from the tap will not cause any fuel to leak from the tap when in either of these positions, it will however flow in the prime position so avoide this position while the fuel lines are removed, if the fuel does flow in the on or resrve poss, the diapram is faulty and will need replacing

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1 Answer

Suzuki gsx600f 1991, has been stood for a few weeks, added fuel system cleaner to fuel, got it started but spluttering under drive but ok in neutral, also fuel gauge and indicators are inop, help!! also...


If you are in a location with high humidity there is a chance water built up inside the tank. Best solution would be to completely drain the tank and refill with new gas. Run position on the fuel tap is 6 o'clock.

Feb 28, 2011 | 2000 Suzuki GSX 600 F (Katana)

1 Answer

Where is the prime position on the fuel on a GSX 750 fn


THIS IS QUITE EASILY RECTIFIED, REMOVE THE FUEL LINE FROM THE TAP,SLOWLY TURN THE TAP FROM 1 DIRECTION TO THE OTHER, WHEN FUEL FLOWS READILY FROM THE OUTLET ON THE TAP, NOTE THE POSITION ON THE TAP AS FUEL WILL ONLY FLOW WHEN IN PRIME POSITION. {VACUME TYPE TAP REQUIRES ENGINE TO RUN FOR FUEL TAP TO OPEN, WHEN NOT RUNNING FUEL SHOULD ONLY EXIT THE TAP IN PRIME POSITION). REASON FOR FUEL FLOW WHILE NOT RUNING WITH TAP IN ANY POSITION, COULD BE DIAPRAM FAILURE IN TAP.

Dec 04, 2010 | 1998 Suzuki GSX 750 F (Katana)

1 Answer

What position on fuel lever is off there is fuel on, res, prime?


It is a vacumn opperated tap, fuel should flow on res or on only when the engine is running. fuel will flow on prime whether the engine is running or not.
There is no off, if fuel flows from res or on when the engine is stopped it needs a fuel tap kit. Also it is best to fix it as they have a habit of flooding the sump with fuel.

Aug 13, 2010 | 1980 Yamaha XS 400 Special

1 Answer

My 1996 750 Katana runs but it will only run with


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

Jul 17, 2010 | 1996 Suzuki GSX 750 F (Katana)

1 Answer

Fuel tap position for 1994 GSXR 750


down for on, forward for reserve, backwards for prime

Feb 20, 2009 | 1993 Suzuki GSX-R 750 WP

1 Answer

Wont run on prime setting on fuel tap


Hi,

On most Japanese bikes, the PRI position allows fuel to flow from the tank to the carbs even if the engine is not running. In the ON position, the fuel gate valve would only allow fuel to flow if there is vacuum which of course would mean that the engine is running. There is normally a vacuum hose from the intake manifold of cylinder 1 that leads back to the fuel valve that triggers the internal diaphragm to open the fuel line.

If we are to assume that for some reason the PRI position is blocked, then switching the "fuel tap" to this position would not allow fuel to go down the carbs. Thereafter, the engine used what fuel was left inside the carbs (100 meters) and the engine died. Switching the "fuel tap" back to ON again would not allow fuel to flow down from the tank to the carbs since there is no vacuum and very little vacuum when starting the bike; and the bike would not start, no fuel inside the carbs.

Correct action of course would mean overhauling the "fuel tap" and initially setting it to PRI and then to ON soon as the engine is running on its own. Temporary remedy/workaround would be to manually feed fuel to all the carbs with the use of an external container with rubber hose/fitting. Alternately, you can try spraying starter fluid or car injector cleaner. This should be done with the air cleaner off. A word of caution, in some older bikes I have worked on, this condition would result to an overflow of the carbs soon as the engine starts indicating that the float(s) inside the carbs are sticking.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

Nov 11, 2008 | 1993 Suzuki GSX-R 750 WP

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