Champ Job Maker heater runs and dies
Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Shops, Barns, Varmints, and Trucks
Forum Description: anything you want to talk about except politics
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=206894
Printed Date: 31 May 2025 at 12:09pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Champ Job Maker heater runs and dies
Posted By: Heliarc
Subject: Champ Job Maker heater runs and dies
Date Posted: 29 May 2025 at 12:16pm
|
Bought a Champ Job Maker heater for a song. Got it home. It runs briefly and dies. Fuel level is fine and fuel seems OK. I blew out all the lines excepting those in the gun, same thing. Runs and dies. Shut it off for about 1 second, it'll fire briefly and die again. Pump continues to run but no flame. I shut it off, cracked the gun line loose, turned it on. I get brief fuel flow from the gun line and it peters out. I open the bleeder while it's still running, good flow. I can stick my finger over the open bleeder and stop the flow, not sure if this is normal. Pump is definitely pulling fuel but after a few seconds it stops pushing anything to the gun line. Had the pump apart a few times, blew out everything I could find, no luck. Same thing. Runs and dies. Opened the transformer just a little when it's running but not flaming, good spark there. No unburnt fuel blowing out of the heater. Has a Webster 1725RPM pump. I figure I need to get a gauge to it but I don't have on unless you can use an air pressure gauge. Unknown on the history of this heater. I have not adjusted anything nor will I attempt to without the gauge and a decent understanding of what I'm doing. Anyone run into something similar? |
Replies:
Posted By: Lars(wi)
Date Posted: 29 May 2025 at 1:15pm
|
‘fuel seems OK’? Maybe wrong fuel? ------------- I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science. |
Posted By: Heliarc
Date Posted: 29 May 2025 at 5:34pm
| It's either heating oil or AG diesel. Either one should be fine for this unit. |
Posted By: Codger
Date Posted: 29 May 2025 at 5:57pm
|
I have an old "Master" heater and does the same thing with a "Webster" pump. I borrowed a low pressure gauge and the pump on mine is shot. It will pull fuel for just a short bit but will not consistently. Pressure falls off and flame extinguishes although the burner nozzle "spits" unburned fuel as the electrodes are too distant. Your pump is worn out. It will pull fuel for the short bit till fluid friction of filling the discharge line and pressurizing it. Once the pump begins to cavitate, the heater shuts down. Unable to further supply pressure or flow, the flame extinguishes until the heater is allowed to dwell and pressure bleeds down on the discharge side of the pump. ------------- That's All Folks! |
Posted By: steve(ill)
Date Posted: 29 May 2025 at 6:35pm
|
are you sure the FUEL LINE and NOZZLE out of the pump are clear and not plugged with GUM ?
------------- Like them all, but love the "B"s. |
Posted By: Riprock
Date Posted: 29 May 2025 at 11:42pm
|
I don't know that brand but i've seen several that have a pencil size nylon type filter inside the brass fuel line coming up out of the tank. You have to break the line and pull the tube out of the tank. Ive also seen one with a plastic fuel filter with an arrow that was installed backwards and would do the same thing.
|
Posted By: Codger
Date Posted: 30 May 2025 at 2:45am
That nylon filter in the pickup tube is a "Desa International" brand and it's associated holdings/brands out there. Cheap and effective but any loss, or reduction of differential pressure across the pickup tube will stall and flame out the heater. There will be an adjustment and a gauze, or foam filter, (washable) in the rear of the pump. Basically a venturi effect pulls fuel from the tank to the burner ejecting it through a conical nozzle where the large fan atomizes the fuel and the mist makes contact with the burner electrodes. If the air fuel balance is disturbed, the heater flames out. Almost, but not quite the same principle an axial flow jet engine operates with. ------------- That's All Folks! |
Riprock wrote:Posted By: DMiller
Date Posted: 30 May 2025 at 2:58am
| Should also be a Flame Sensor on these, most can start as the electronics will set the flame but the sensor not see the Heat for the electronics will shut the pump down. |
Posted By: DaveKamp
Date Posted: 31 May 2025 at 2:07am
|
Sounds to me like the pickup tube/filter is plugged up... ------------- Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest. |