Question about Rinnai Toyostove Direct Vent Heater: Toyostove Laser 73 Shipping

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I inherited a Laser 55 with an internal fuel capsule. If I hook up the internal capsule tank the kerosene fills up the fuel sump but once the kerosene fills the entire sump the kerosene will literal overflow from where the metal sump lid meets the sump. I appears to be leaking from one edge of the lid/sump area where there is some sort of bump out that's on the lid. So my question is this? Why do you think the sump is leaking and how can I fix it?

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Hi John, I would say it is leaking because the needle valve in the fuel sump isn't shutting off the fuel flow once the level is where it needs to be. The sump is vented to atmosphere so the fuel will gravity drain to the sump. The fuel sump has a float like a lawnmower carbuerator. You can take the sump out and clean it and that may help. Kerosene will sometimes gel after it has sit a while. Carb cleaner usually does a good job. Let me know what you find. My uncle worked on these heaters for 20+ years then trained me. I have an old non working Laser 55 that has some good parts on it if you are ever in need.

Posted on Sep 09, 2010

Testimonial: "I did exactly what you said and it worked like a charm. I thank you very much for your help. I will keep you in mind if I need parts from your old 55"

  • Johncmar Sep 09, 2010

    Thanks for the quick and helpful response. I will keep you posted!

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Hi,

As you have mentioned that you hear a ticking or thumping noise, means the fuel isn't getting to the fuel sump. It could be caused by an air bubble in the fuel line, a clogged filter at the tank (if you use an outside tank), or a clogged fuel strainer in the fuel sump.This can be caused by several things. Most commonly a fuel flow problem or out of fuel. If you are out of fuel or the fuel just isn't making the fuel pump, the pump will make a loud ticking or thumping sound. You should check your filter at the oil tank, if you use an external tank. You should also check the strainer in the fuel sump located on the right side of the heater. Two screws hold the cover on. You need to turn off the fuel valve at the tank and have some rags to soak up the kerosene that will come out when you remove the two screws. Take the top off the fuel sump and inspect it also. Kerosene sometimes gels up after sitting a while. The fuel nozzle also gets clogged with carbon from time to time. You can clear this by removing the fuel line from the combustion chamber and inserting a piece of wire into the hole about 2 inches. Another possibilty is a dirty flame rod. You can clean it with some steelwool.

Let me know,if needed further assistance.

Hope i helped you.

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