Just replaced the ignitor on my mr heater because the old one was arching off the mounting bracket, now it fires for a second and puts out a large puff of smoke and blows diesel fuel out the front of it. I have not messed with anything else, what needs to be done to cause the fuel to burn instead of blowing out the front?
Heating & Cooling - Mr. Heater - MH125KT Utility
Answers & Comments
I know the post is old but i had the same issue and found out what can cause the problem
Remove the metal cap and platic side pannel
You can see those hoses one go from air pump and the other one from the fuel tank
My was crack so bring to the bad air/fuel mixture and the diesel was leeking from the one so the air was pushing the leeking diesel to the front and that was cosing the issue
Cost me 6 $ to fix this up
Just 3 feet of fuel line
:) hope that will help someone
Cheers
Well for one it should have (kerosene) in it and not diesel. two you need to clean out the pump and lines as well . it should have a spray pattern, not drips. sounds like wrong fuel and or not enough pump pressure.
ok, then it sonds like the ignitor is not positioned at the right angle to catch the spray pattern. remember that diesel fuel has a higher flash point roughly at (143 degrees), however the kerosene will ignite quicker at a point of (100 to 162 degrees) which is more useful for heaters ignitors since the temp at which the ignitor has to reach in order to fire the fuel. what Im suggsting to you is try it with the kerosene and see how better or worse it works. the new ignitor is definately the area of concern for me
temperature
Ethanol (70%) 16.6 °C (61.88 °F) [2] 363 °C (685.40 °F) [2]
Gasoline (petrol) -43 °C (-45 °F) 246 °C (495 °F)
Diesel >62 °C (143 °F) 210 °C (410 °F)
Jet fuel >60 °C (140 °F) 210 °C (410 °F)
Kerosene (paraffin oil) >38°–72 °C (100°–162 °F) 220 °C (428 °F)
Vegetable oil (canola) 327 °C (620 °F)
Biodiesel >130 °C (266 °F)