matthewk4
I'm installing a never-before-installed 58710 (air-cooled 10kw Guardian). Back of the unit has a 3/4" female gas inlet. Supplied loose inside the unit is a 12" rubber gas hose with some adapters on it. But the hose isn't 3/4" and doesn't have 3/4" fittings on it, necessitating reducers all over to make use of it. What was the reasoning behind supplying the narrower-diameter rubber hose?
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Cobranut
Just a thought, is it possible that hose is for the oil drain?  Though I suppose if it were it would've been already attached to the engine.
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78buckshot
It may be the wrong flex connector, some were shipped with 1/2 inch some with 3/4 inch. It should be OK to use but the rest of the gas piping can not be smaller than 3/4 inch. Not true with all things in life but in the case of generator gaseous fuel systems - the bigger the better, consult the piping chart and follow it.
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grsthegreat
A lot of the older units came with 3/4” connectors on generator and a 1/2” RUBBER fuel line with bell reducers back in the day. On the lower HP units. I believe all were changed to a 3/4 stainless steel flex hose a few years back
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Birken Vogt
You almost always had to make some 90 degree turns before and after the rubber line.  Those fittings would be where the size would change from 3/4 to 1/2 and back again.  I believe on propane if the fuel pipe was short it could also be 1/2 steel for some distance.
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