Dayton torpedo heater now won't draw fuel

mkirsch · Jan 31, 2015

I took the secondary air filter out of the Dayton heater, and now it makes over 15PSI.

Set it at the specified 5PSI, and it won't draw fuel.

It won't draw fuel unless I use the air compressor, and it takes a TON of pressure before it starts misting.

Nothing is plugged. The nozzle is clean as a whistle.

jimg.allentown · Jan 31, 2015

The fuel in those heaters is drawn up to the nozzle by "venturi effect." The air passing over the feed tube creates a vacuum that draws the fuel up from the tank. About the only answer I can come up with for you is that the feed tube has a restriction, or there is contamination on the fuel where the tube picks up, or the fuel is too heavy/thick to draw up through the tube. The fuel is drawn up by the VELOCITY of the airstream, not the pressure. If you have good airflow through the nozzle, go over the fuel pickup. there has to be a restriction.

As a side note, I have several of these heaters. If you are using #2 heating oil or diesel fuel, those fuels are heavier and subject to jelling. As they approach the jell point, they become heavier and thicker, and will not draw or atomize well. Using straight K-1 kerosene will solve that problem.

Bob · Jan 31, 2015

Do you have the correct nozzle (which will look something like this photo) that has an INTERNAL sort of venturi setup that uses the air passing through to create a pressure depression that pulls full upward from the tank?

The link below goes into detail about air atomizing nozzles.

<img src = "http://www.atwholesaleprice.com/image/cache/data/part/26DG96-1000x1000.jpg">
BLOW it out

mkirsch · Jan 31, 2015

IT RUNS!

The air line was no good.

All I did was put it back together with the new air line. Plugged it in to see if it would spray fuel, and BOOM, it fired right up.

At first it wouldn't run with the top cover screwed down. Running lean.

I had to up the pressure to 7PSI to get it to run with the top cover on... Lean mixture wouldn't fire. That may be due to the fact that I'm running diesel and not kerosene.

rustyfarmall · Jan 31, 2015

(quoted from post at 13:02:12 01/31/15) IT RUNS!

The air line was no good.

All I did was put it back together with the new air line. Plugged it in to see if it would spray fuel, and BOOM, it fired right up.

At first it wouldn't run with the top cover screwed down. Running lean.

I had to up the pressure to 7PSI to get it to run with the top cover on... Lean mixture wouldn't fire. That may be due to the fact that I'm running diesel and not kerosene.

Diesel is all I've ever run in mine. Who can afford kerosene?

mkirsch · Jan 31, 2015

Agreed. Plus you can't swipe your card at the kerosene pump and you have to sign a paper.

IowaJohn · Jan 31, 2015

Glad to hear it runs, I replaced all my lines and filters still wouldn't run ended up the rotor on the pump was in pieces.

Dayton torpedo heater now won't draw fuel

mkirsch

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jimg.allentown

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Bob

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mkirsch

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rustyfarmall

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mkirsch

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IowaJohn

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