Posted by rrlund on March 14, 2023 at 10:01:15 from (173.225.203.221):
Does anybody know how those Thermo Start manifold heaters work? Does something open up inside them and let the fuel in when they reach a certain temperature or something? There's no wire to the little fuel reservoir, there's fuel to the nozzle/heater unit all the time.
I had one quit working three weeks or so ago, so I ordered a new one. Meanwhile, I discovered the old one popped (ignited) after 30 seconds or so. It used to after about 15 seconds. The new one got here, so I went ahead and put it in, figuring it would pop after 15 seconds or so like it used to. It didn't. In fact, in the two weeks or so since I put it in, I've only heard it pop once, and that was after 30 seconds or more.
It's been relatively warm, so I've just been holding it for 30 seconds and it been starting. I figure it must have just been getting enough heat from the electrical coil to give it the little help it needed. This morning it was 16 degrees. I finally got the tractor started, but it took a while. I felt the unit and about burned my finger from the electrical coil being so hot, but it never popped. I've had the T off, blew through it, blew air up the fuel hose all the way to the tank, and still no pop.
I'd put the old one back in and try it again, but the old one had a spade fitting for the wire and the new one has a screw, so I had to cut it off and put a new one on it for the screw. I don't have any new spades that big. I'd have to go to town and get one. I hate to keep cutting that wire back, it's none too long now. I could clamp it with Vice Grips I suppose, but I'm not going to run it that way.
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