Question about 1985 Suzuki GS 700 ES

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I can not get gas to the carbs how many vacuum hoses feed into the petcock??

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Petcock should only have [1] vac to inlet manifold & [1] fueling carbs & would be different diameters so you cant confuse them
Cheers Rob.

Posted on Jul 30, 2009

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Make sure the vacuum line is not old and leaking or cracked. It has to have good vacuum from the # one intake to open the petcock.

Posted on Jul 31, 2009

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Need a fuel line diagram for 1985 700 yamaha maxim


There\'s no "fuel line diagram" for the Maxim-X that I\'m aware of but the fuel lines aren\'t all that complicated.



Let\'s start at the gas tank. The petcock has 2 hoses coming from it - the smaller of the two is not a fuel line - it\'s the vacuum line to trigger the petcock valve and it connects on the hose nipple at the top of the #2 intake manifold. Some people have petcocks where the vacuum hose leaves the petcock toward the back of the bike before doubling back to the #2 manifold. Others have petcocks where the vacuum hose leaves the petcock toward the front of the bike before connecting at the #2 manifold. Either way works. It\'s not important which way as long as the hose doesn\'t get kinked and cut off vacuum from the manifold.



The larger hose from the petcock is, of course, the main fuel feed. From the factory there was not an in-line fuel filter in that hose but there should be. In fact, it\'s one of the first things I recommend to people who are tinkering with their X fuel system. Install an inline fuel filter right behind the petcock as shown here:

http://www.maxim-x.com/fuel_filter.html (there are pictures midway down the page)

The end of the hose emerging from the fuel filter has bends in it in order to neatly find it\'s way to the fuel T between the #2 and #3 carbs. The T is just above the tops of the bowls. Don\'t be afraid if you see the fuel T rotate while pressing the hose onto it - that\'s fine.... unless it rotates too freely in which case the seals might dried up and you might experience some seeping or even full blown leakage around the T fitting where it enters the #2 and #3 carbs. Oh... one more thing about the main fuel hose - there is a guide loop bolted to the carb rack on the rail joining the top-back of the carbs, between the #2 and #3 carbs. The main fuel hose is meant to be held in that guide loop.



Two down - two to go.



There are only two remaining and identical fuel hoses - they are actually float bowl vent/overflow hoses. There are 2 more T fittings on the X Mikunis - both are at the same level.... just a bit higher up than the fuel T for the main fuel hose. There is one vent/overflow T between carbs #1 and #2 and another between carbs #3 and #4. Just like the main fuel inlet, these T fittings also rotate. But unlike the main fuel inlet, if they rotate too freely and imply that the seals may be dried up, it\'s of little consequence because they\'re only vent/overflow fittings anyway. If the carbs are setup right and the float valves aren\'t sticking then there should never be any fuel in those hose at all. Seriously - they should remain forever dry and fuel-free if everything is correct. It\'s only when the float valves stick or if someone incorrectly sets the float levels too high that you\'d ever expect to see any fuel coming from those fittings through either of the vent/overflow hoses.



There is one caution about connecting the 2 vent/overflow hoses. Make sure they aren\'t directed UP from the T fittings and draped over anything before heading down again. The hoses should leave the T fittings in a downward direction, otherwise, if there\'s some kind of condition that causes float levels to be too high, draped hoses will allow the fuel levels to get much higher in the carbs before draining away and that can lead to other unhappy things.



So to sum up - there are only 4 hoses involved in the Maxim-X fuel system (unless you\'re in California in which case there\'s an extra bottle and lines). 1.The petcock vacuum hose, 2.The main fuel feed which goes to a T between carbs #2 & #3 and which should have an inline fuel filter installed, 3.The left float bowl vent/overflow hose which connects to a T between carbs #1 and #2 and should be directed down, and 4.The right float bowl vent/overflow hose which connects to a T between carbs #3 and #4 and should be directed down. That\'s all there is.



HAP

www.maxim-x.com

Aug 14, 2014 | 1985 Yamaha XJ 700 X Maxim

1 Answer

Where the fuel hoses go


If you have a petcock below the tank with a reserve switch, you should have two lines. The smaller one is a vacuum line that goes to the carbs. The other is the fuel line. The vacuum line is important, as without it the petcock will not flow fuel. The presence of a vacuum opens a pneumatically operated valve in the petcock allowing fuel to flow. There should be a nub on the middle of one of the carbs to connect the vacuum line to. The fuel line goes to a fuel rail that feeds all the carbs.

Apr 26, 2014 | 1995 kawasaki ZX-6R Ninja

2 Answers

I have a vacum line off and a plug missing need to see diogram on CARB AND VACUMS LINES BECUASE NOT GET GAS TO CRAB


If you're not getting fuel to the carb, then the vacuum line you're talking about comes from the backside of your carb and feeds vacuum to both the VOES switch and the vacuum operated petcock. The VOES is either up in the tunnel of the fuel tank or on the choke cable bracket. The nipple for the vacuum line on the petcock is on the backside of the petcock. The nipple for the vacuum line at the carb or intake should be visible is you look at the backside of the carb from the left side of the bike.

Good Luck
Steve

Jun 09, 2011 | 2003 Harley Davidson XLH Sportster 883...

1 Answer

Gas not getting to engine, where do i start?


open the float bowl drain screw. This will verify if gas is getting to the carb, it will also tell you if there is water in the gas. To check the petcock Turn the fuel petcock to on and reserve, You may have a vacuum operated petcock: is so you will need to apply vacuum to the correct hose. If gas is flowing and filling the carb bowl then the carb jets are clogged. Also check for debris that may be blocking fuel from entering the petcock, (rust in tank)

Aug 24, 2010 | Buell Blast Motorcycles

1 Answer

Need to adjust the idle on one cylinder on harley


Ok, first off, this ain't no Yamaha you're messing with. It's a completely different motorcycle in most every way. Not saying it's better or worse than the *** bike but it's different.

It has two cables, this is correct, but only one carb. One cable is the throttle cable and the other is the idle cable. The idle cable pulls the carb shut in the event the throttle plate spring breaks on the carb. It's a safety thing and it was the same way on your Yamaha.

Now, if the front cylinder is not running at idle, I would suspect a vacuum leak somewhere. There are several places where you could have a vacuum leak. Of course, the intake manifold seals could be leaking, the intake carburetor seal could be leaking, or the VOES/ petcock line could be causing a problem. Unless you have taken your air cleaner off for some reason, I'm going to assume that the problem is in the petcock.

Your bike has one of the vacuum operated petcocks in the tank unless it's been changed already. Vacuum from the engine opens the petcock allowing fuel to the carb when the engine is running but when the engine stops, the vacuum disappears and the petcock closes. Supposedly. This is the worst piece of junk Harley ever put on their motorcycles. They do two things, they quit working and won't let fuel into the tank or they cause a small vacuum leak that will cause the bike not to idle properly. I suspect you have the latter case.

Drain your fuel tank by loosening the petcock and allowing the gas to run out around it. Catch the fuel with a large funnel and an empty fuel can large enough to hold the fuel in your tank. Once empty, disconnect the two hoses and remove the petcock. On the backside of the petcock, there is a square plate. Remvove the four small screws and take the plate off. There will be a diaphragm, a spring, and needle under the plate. Remove the plate carefully so you can see how it goes back together. Hold the diphragm up to the light and gently stretch it while looking for holes. If you find a hole, you'll have to either buy a new diaphragm and repair your petcock or , better yet, replace the entire petcock with a manually operated one. A Pingle petcock is a very high quality valve and you'll like it but it is pricey. If you buy an OEM petcock, get one for a 1995 or earlier bike. You will no longer need the vacuum line and you can plug it with a small bolt or something to stop the vacuum leak.

This vacuum line comes off a nipple at the backside of the carb and it feeds vacuum to two things. It's a 3/16" hose that goes up to the VOES switch mounted on the frame under the tank. From there it "Y's" off to the smaller hose that goes to the backside of your petcock. Take your fuel tank off and inspect this hose. Look for cracks. If you go with the manual petcock, eliminate the small portion of the hose by replacing the hose that runs to the VOES with the single hose instead of the "Y'd" hose.

As for the idle speed of you engine, it should be set at about a thousand RPM. Look at the top of the carb. There is a screw near the top on the right side of the carb. That is the throttle stop screw. It controls the idle speed of the engine. Turn the screw clockwise to increase the idle speed.

Ok, try what I've written here. If it doesn't work, get back with me.

Good Luck.
Steve

Jul 20, 2010 | 1993 Harley Davidson XLH Sportster 883

1 Answer

Wont stay running,like its out of gas. but its not


It may indeed be out of gas. You can have a full tank of fuel and be "out of gas" in the carb. The culprit could be the vacuum operated petcock. The petcock has a diaphragm in it that is opened by engine vacuum. If that diaphragm is not functioning as it should, no gasoline gets to the carb.

To test the petcock, reach around behind it and feel for a small vacuum hose. Unplug this hose and replace it with a hose you can **** on. Using your mouth, **** on the hose with the fuel line disconnected. You should see fuel flow out of the petcock. If not, you must drain the tank by loosening the petcock and allowing the fuel to run out of the loose petcock. Use a large funnel and an empty fuel container to catch the fuel. Once the fuel tank is empty, remove the petcock. Take the plate on the back of the petcock off by removing the four small screws. You'll find a diaphragm, a small spring, and a needle. Hold the diaphragm up to the light and stretch it gently. If you find a hole in the diaphragm, replace it. Check the petcock for obstructions by blowing through it. Reassemble the petcock and test it again.

Check the hose that supplies the vacuum to the petcock. It comes from the backside of the carb and runs upwards to the VOES switch and then reduces in size and goes to the petcock. Make sure it's connected and has no holes or cracks in it.

If everything looks alright, replace the petcock, connect the hose and try to start your bike again.

These petcocks are notorious for giving problems. I always recommend that the vacuum operated petcock be replaced with a high quality manually operated petcock such as a Pingle. They're expensive and require you to manually turn the gas off like the "old school bikers" do but they won't leave you stranded out of gas with a full tank of fuel.

Good Luck
Steve

Jun 17, 2010 | 2003 Harley Davidson XLH Sportster 883...

1 Answer

My 2000 HD flstc is leaking gas from the petcock. How do I fix this?


Sounds like you've got a hole in the diaphragm that's inside the petcock. To fix it, you must first drain the tanks so you can take the petcock out of them.

With the petcock out, look on the backside of it. You'll see a plate with four small screws in it. Remove the screws and a diaphragm, a small spring, and a needle valve will be behind the plate. Hold the diaphragm up to the light and slight stretch it. If you find a hole, there's your problem. Replace the diaphragm.

Now, you're one of the luckier ones. Usually these vacuum operated petcocks simply quit allowing fuel to flow to the carb. They simply won't open and they leave you stranded with a full tank of fuel but none in the carb. I suggest the purchase of a high quality manually operated petcock such as a Pingle. If you choose to go this route, you must eliminate the vacuum hose and plug it up so that you don't have a vacuum leak at the carb. The vacuum line that comes off the back of the carb has a "Y" fitting in it. The main hose "Y"'s out to feed vacuum to the VOES and the petcock. Replace the entire hose with a single hose going from the carb to the VOES thereby eliminating the hose for the petcock.

Good Luck
Steve

Jun 16, 2010 | 2000 Harley Davidson FLSTC Heritage...

1 Answer

GSF 600 SV 97 fuel problem


If the bike will run with the choke on then you have a lean fuel/air mixture condition. Most common cause is a vacuum leak or faulty pitcock. Spray some carb cleaner around the carb mounts with engine at idle, if the rpms change there is your leak.
Your petcock should have two hoses attached to it. One hose is the main flow to the carbs. The other hose is/should be a vacuum hose that allows the gas to flow (when vacuum is applied). When your petcock is in the PRI position, this will bypass the vacuum hose. Leaving it in PRI when motor off could possibly flood the engine. Check to see if that vacuum hose is attached properly with no splits or cracks near both joints. If all is attached properly your problem is the petcock itself. It has a diaphragm and 'return' spring. Weak return spring, clogged petcock, damaged diaphragm can all cause your problem. Also, after you recleaned and inspected the carbs, were they synched... if not, this needs to be done.
Good luck...i hope this helps..please rate me a fixya.

Sep 19, 2009 | 1997 Suzuki GSF 600 N Bandit

1 Answer

Hoes parrtern for a 1995 suzuki katana gas tank.


there should be a vacuum hose coming from carb 4 that goes to the port on the rear of the petcock. as for the other 2 they are feed lines the 1 facing the rear of the bike goes to a hose between carb 1 and 2 and the 1 facing the front of the bike goes on the hose between carbs 3 and 4. the 2 remaining hoses on the carbs get criss crossed across the carbs and draped down thru the holders on the frame they are just overflow tubes incase you dump your bike. the other hose on the tank is a vent tube. hope this is helpful.

Jun 27, 2009 | 1995 Suzuki GSX 600 F (Katana)

2 Answers

I have two loose hoses coming off my petcock? where do they go


On your silverwing you have a "vacuum operated petcock" which means that the carbs draw a vacuum and allow the fuel to flow from the petcock. The front hose is the vacuum hose that should run to the center of the carbs. The second is a drain hose - it's advised that you do have a small hose connect here, so that dirt does not find its way into the petcock. This hose will simply run down past the swing arm to the ground. This would prevent any gas from dumping itself onto the engine if your petcock fails. If your bike runs without the vacuum hose attached, your petcock has failed and will need to be rebuilt.

May 09, 2009 | Honda Silverwing 400 Motorcycles

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