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have to use choke means fuel problem. Check your fuel cap vent, fuel filter. Fuel solenoid opening with key turn on. Remove hose from carb.and see fuel runs out.
Sounds like contamination has set into the fuel shutoff valve on the bottom of the fuel tank, or the fuel cap vent hole is plugged. Test the fuel line that comes from the fuel tank. First turn the valve off, disconnect the fuel line that feeds the carb, insert the fuel line into clear small container, then open the fuel valve to the on position and look for fuel flow,now turn the valve to the reserve position and check again for fuel flow. If these test fail to yield fuel try the procedure again this time with the fuel tank cap loosened and check for fuel flow. If in both tests the fuel fails to flow then the problem can be isolated to the fuel valve/tank outlets or the fuel line to the carb.
I'm guessing that the fuel block you refer to is the inner side of the petcock assembly. If this is so, the larger line is the fuel supply and connects to a swivel pipe in between two of the carburetors and feeds all four through internal piping. The second smaller hose is a vacuum line to operate the petcock and runs from one of the rubber carb mounts to the petcock. My 85' model also has four vent hoses running from the top front part of each carb back and down between each one. I hop this helps.
This is fuel starvation, start by replacing the fuel filter in the fuel tank, check the fuel hoses up to the carb for signs of leaking or cracks, if this does not help, then there is a fuel screen in the carb, it is situated ubder the fuel pump cover, this is the alluminium cover held with a single screw, you may be able to remove this cover without removing the carb, depends on the orientation of the carb on the machine.
There are 2 different enigines on these depending upong your actual unit model number.
One had a Subaru 175 cc engine and the other was a Honda engine. For carb specifics I need the ENGINE model number. Either way... here is what you need to do:
1. Fuel selector off.
2. Remove main fuel line from the carb.
3. Use a spray can lid and check FLOW. It should fill the lid in under 8 seconds. (Feul selector OFF now) If you do not have good fuel flow here you need to inspect the tank exit port, in line fuel filter if used and the sediment bulb under the fuel selector for debris
(GOOD FUEL FLOW NOW)
4. Remove the float bowl by unscrewing the bowl nut from the bottom of the carb. NOTE positon of gaskets as you remove float bowl. Use carb cleaner and direct a spray hopefully with mini extension tube of the carb nozzle into the center of the threaded area of the bowl nut. (This cleans main fuel jet orifice / pin hole) Then spray carb cleaner using mini nozzle extension up the flat side of the float needle until carb cleaner exits the main fuel line connection. Last spray from the main fuel line connection to the float needle (reversed spray)
This usually removes any debris from the float bowl. main fuel jet and main fuel manifold Reinstall the main fuel line.
- Turn on the fuel selector and use the spray paint can lid under the float to catch fuel. It should fill in 8 to 10 seconds to the point your worried about over-flow.
- GENTLY lift the float needle to the level position. FUEL MUST STOP.
- Lower Float to resting position. FUEL MUST FLOW so that it would fill the spray paint can lid in 8 to 10 seconds. (FUEL SLECTOR OFF)
Clean the bowl nut and reinstall the float bowl. Turn on the fuel.. wait 30 seconds for the float bowl to fill completely and start unit. If it runs GREAT... If it only runs with the choke on you still have a fuel supply problem...i.e most likely the main fuel just in the threaded area of the bowl nut is still clogged. .
This should get you going. Thanks for choosing FixYa,
Kelly
There is a vent in the tank, it is situated on the right hand side of the tank, close to where the fuel hose exits the tank, the early vent looks like a round white pellet, the later vent is a white plug with a nipple on the top, the later vent will just pull out with long nose pliers, the early vent has to be extracted useing a self tapping screw, this of course will destroy the vent.
Ok, the 1/4" hole is probably the float bowl vent. Look at the front of the carb you want to install the hypercharger on. It probably has three screws that hold the air filter on and then a fouth hole. This is the float bowl vent. Look at the hypercharger and see if it has the four holes or just three. This may be the reason for drilling the hole.
Now, the butterflies are controlled by vacuum. The hose from the hypercharger has to go to a vacuum source from behind the carb. There is a hose that runs from the backside of the carb up to the VOES switch and the fuel petcock. You may can splice into this hose.
2 lines are vent lines, make sure they are unpluged , and clear. the other is the fuel line that runs to the petcock, and one from the petcock to the front of the carb near center of motor, this is a vaccuum line witch allows the petcock to open , and let fuel flow in the off position from tank to carb. hope this helps
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