Clogged regulator? when my coleman gas camping grill is all hooked up, and i turn the burner knob on, the gas comes out for a second and then stops as if its being turned back off. if i turn it off and wait a few seconds, and turn it back on, it does it again.

Tyrn off tank open conrtol knobs to burners , turn off burners turn tank on slowly see if gas comes out now , if not check burners are not blocked or injectors are not blocked

http://www.fixya.com/support/t9517666-new_propane_tank_burner

Lloyd, the regulator isn't working. But the problem generally, easily solved, if you follow the directions below.

To solve this problem, first be sure you have adequate gas in the tank. If that checks out OK, do the following:

1. Turn the gas tank valve OFF and disconnect the hose from the tank.

2. Wait 5 minutes and reconnect the hose to the tank.

3. Open the tank valve VERY, VERY SLOWLY (Slow motion, slow).

4. Once the tank valve is fully open, light the burner farthest from the tank first and set the burner
control knob on HIGH. Does the flame height look correct for being set on HIGH? If so, light
the remaining burners the same way. Do all the burner flames look correct? If so, you solved
the problem. Remember, to always open the tank valve Very, Very Slowly.

If that didn't solve the problem, you will need to replace the grill's Hose/Regulator Assembly. It runs about $30.00 at any home center or hardware store that sells grills & accessories. If you replace it, turn the tank valve ON Very, Very Slowly.

Hope this helped you to troubleshoot and solve the problem. Happy Grilling!! And thanks for choosing FixYa.

Hello,
You may have turned the gas tank valve on too fast. Turn it back off, disconnect it and reconnect it. Then very slowly turn the valve back on. Light one burner at a time and turn to low before lighting the next. If you are hearing and smelling gas with the tank on but all grill knobs off, don't use the grill. You may have a leaking grill valve, regulator or hose. If you are only smelling gas with the knobs on, it's possible you have a clogged burner or orifice from bug nests, spiderwebs, etc and need to clean it out first. Hope this helps. Douglas

Is it still under warranty? I'd call Viking or a qualified repairman to fix it. If your burners are clogged, the flames should be coming out the venturi tube and flaming towards the gas valve knob. If the flames are coming out of the gas valve itself, then it will need to be regreased. If the burners can be removed without too much trouble, soak them in the sink with hot water and dishwashing detergent. Be sure to remove the knobs, so no one turns the gas on without the burners connected. If it's difficult, call a repairman.

The connector for attaching the regulator to a disposable propane cylinder has a sintered bronze filter in the tip of the brass probe tube that is prone to clogging, or the bronze pellets get mashed down over time, restricting gas flow, and this will cause a portable grill or camp stove to perform poorly. The filter is so fine that it takes very good eyesight and bright light to see that it isn't solid metal, or use of a strong magnifying lens. The best solution is to buy a new Coleman regulator assembly. If you are unable to get a new regulator assembly and have the skills and the tools, you can try drilling a very small hole on the side of the probe tube with a #60 drill bit, just below the bronze filter, but near enough the end of the tube so that the hole will be past the plastic seal when the disposable cylinder is fully screwed into place. You should avoid drilling directly into the end of the probe tube, as the end of it is used to depress the Schrader valve in the disposable cylinder to allow gas to flow. A #60 wire gauge drill bit is only 0.040 inch (1.016 mm) in diameter, but makes a hole large enough to supply sufficient gas to a portable grill or a dual-burner camp stove. If you choose to perform this work, the probe should be unscrewed from the regulator body and the Schrader valve core in the probe tube should be removed before drilling. Be sure to clean all brass and bronze particles out of the probe tube before re-installing the Schrader valve core and the screwing the probe into the regulator. Use a removable-grade thread locking compound to secure the probe in the regulator body and don't over-tighten it, so as not to crush the rubber gasket. Allow the thread locking compound to cure for several hours before attempting to use the regulator. Keep in mind that this modification increases the likelihood of dirt getting into the needle valves and jets of your stove or grill, which can cause maintenance problems in the future.

1st. Are the humming evident when the flame ain't burning? Listen carefully. The control(knob) consists of a valve that regulate the supply of gas to the burner. Check each knob(valve) individually for noise. If noise is evident on the knob(valve) contact your dealer for service or replacement of valve.
2nd. Check the gas regulator. That will be the unit that is exiting the gas bottle. Noise might be evident from the regulator due to the gas being controlled. If excessive noise is evident. Service or replacement of the unit might be necessary.

Check the regulator they may have it installed backwards

Since 1995 all regulators (the part that attaches to the gas tank to regulate the flow of gas) have included a safety device that restricts the flow of gas in the event of a gas leak. This safety device can be inadvertently activated in two ways, putting the grill into what is commonly called “bypass”. The first way for the device to be activated is to leave one or more burner control knobs in the “ON” position when the LP cylinder valve is opened. The second is not to wait long enough to “start” the grill after opening the LP cylinder valve. The safety device in the regulator is activated each time that the LP cylinder valve is opened. The device resets itself when the gas pressure equalizes between the closed burner control valve and the regulator, through the hose. If a burner control knob is turned on before the gas pressure can equalize, the device will remain in “bypass”. The length of time necessary to wait to “start” the grill after turning on the LP cylinder valve is dependent on the length of the hose and outside air temperature. It is always good practice to wait a few seconds after opening the LP cylinder valve before turning on the burner control knob to start the grill.
Keep in mind that the safety device reacts to a gas leak. If a grill is in bypass, the gas connections and hose should be tested for leaks with a soap and water solution.
If the grill is in bypass, after checking for gas leaks do the following to get the grill out of bypass:
To reset the gas safety device:
Open the barbecue lid.
1. Close the LP tank valve.
2. Turn your burner control knob to the OFF position.
3. Wait at least 5 minutes if the barbecue had been lit, then
4. Disconnect the hose from the LP tank.
5. Turn your burner control knob to the HIGH position.
6. Wait at least 2 minutes, and then turn the burner control knob to the OFF position.
7. Re-connect the hose to the LP tank.
Re-lighting the barbecue:
1. Open the barbecue lid.
2. SLOWLY open the LP tank valve all the way and wait 1 minute.
3. With the lid open, turn the burner control knob to the HIGH position.
4. Ignite the grill by pushing the crossover ignition button.
5. Close the barbecue lid.
6. The barbecue should reach 500 to 550 degrees in 10-15 minutes.
When you are done grilling:
1. Turn all burner control knobs to the OFF position
2. Turn off the LP tank valve last.
* Always follow the re-lighting instructions whenever you use the adapter hose and larger tank.

The issue is with the valve that is connected to the knob. it is poorly designed. To fix it take off the lid assembly and remove the front black cover that covers the knobs. remove the almost diamond shaped metal piece that the knob shaft runs through. put on your gas tank and adjust the valve to a position where no gas comes through.. might be lucky or you will have to replace that valve.