Need a diagram of fuel lines my carbs have 2 vac lines on backside and one in front and one more for main fuel

You should have 2 lined coming from tank. A return and feed. Normally the return is the lowest positioned outlet on the carb, and the feed is at the top. When pumping the purge bulb take the gas cap off tank, and you should see fuel being returned to the tank from the return line. If not, switch the lines on carb. If still not returning fuel to the tank, you will need to pull the carb and inspect the metering and fuel pump diaphrams.

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

Go to searspartsdirect.com and enter the model number and it will give you a diagram for the carb. Hope this helps.

your right about gas lines

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

Should be vac diagram either on fan shroud or on sticker underside of hood. If no longer vivible can always go to an auto store for a schematic. good luck

retgmdI need the same, did you ever find one?

try running the vehicle without the feul cap and see if it quites or keeps running.

YOU SHOULD HAVE A COMMON FEED & 2 RETURNS(1 FROM EACH CARB)THESE LINES DRY OUT OVER THE YEARS & KEEP THERE SHAPE YOU SHOULD BE ABLE TO FIGURE THIS OUT FROM THE SHAPE THEY HAVE RETAINED(THEY WILL ONLY GO ON WAY ACCORDING TO THE SHAPE OF THE LINE.HOPE THIS HELPS.THANX FOR USING FIX-YA.PLEASE POST ON ALL REPLYS.