Generator Propane Conversion

We decided to attempt a generator propane conversion, after seeing what happened with hurricane sandy, we decided it was the best option for our families safety.

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We finally received the conversion kit in the mail the other day.

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this is the company we ordered our kit from, they were very helpful and e-mailed me several times for clarification on what we needed

http://www.propane-generators.com/

biggest question they had was the make and model number for our motor, we have a husky with a subaru engine, the model can be found on the tag on the side of the engine, as you can see on the bottom of the tag we have a robin ex30

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we started by using the regulator for the engine and marked out mounting holes for it

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and then drilled them out

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we removed the air filter cover

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and the air filter itself

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we opened the bag of supplied parts

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and started putting together the carb adapter

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We bolted down the regulator onto the frame through the holes we had drilled out

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we screwed down the engine inlet onto the regulator and the propane feed line onto the regulator

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we removed the mounting bolts for the air filter and replaced them with the supplied spacer bolts for the carb block and mounted that

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we tried remounting the air filter assembly over the block but with the increased space we could not clear the down tube of the genny, I looked at my dad and said we need to cut the down tube, he responded no we don’t want to do that, we will just trim the air filter , so my dad broke out his roto tool

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and he trimmed out the outer edge of the air filter to give us clearance

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with the air filter housing trimmed we were able to fit it onto the carb block

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we remounted the vacume hose onto the air filter

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and connected the gas line from the regulator to the carb block

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we screwed down the tank regulator onto the tank hose

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and connected the hose to the engine regulator

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since the spacing was so close with even cutting out the air filter we could not attach the air filter cover

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so we popped the air filter in place and used a rubber band to hold it in place

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we hooked up the propane tank

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and we were ready to fire it up

to start the genny on propane you turn the gas on the tank and there is a prime button on the back of the regulator to drain the air out, you can see it here right above the brass fitting

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our first firing

my father was adjusting the set screw in the front of the regulator trying to get the right air/fuel mixture

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we started messing with the tank and was able to get a good fuel mixture by almost turning down the propane feed and we were able to get it running perfectly with playing with the tank, something still wasn’t right

we reread the manuals and couldn’t find anything, well actually we did, remember when I said we needed to cut the down tube?

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my father doesn’t want to talk about this

anywho, my dad hopped on line and found out he was adjusting the wrong thing, the set screw in the front of the regulator isn’t it

it’s the brass t-fitting on top with the bolt and the lock nut on it,

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once you get it running you loosen the set nut and adjust the bolt till you get it idling where you want to, you then tighten the lock nut to secure the setting. We adjusted that and now it purrs like a kitten. Also make sure you run it with the choke set to run not start.

We went with the dual fuel kit so we would still be able to run gas as well as propane. The price was only 30 dollars more I believe but if you go with just propane you have to tap into the carb so you couldn’t go back to gas without buying a new carb. Any questions fire away.

 

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  • morotetsuke

    4.7 gallons of propane in a grill tank at roughly $2.40 per gallon.

    wonder how long it lasts under load?

    • http://propanegenerator.biz/ MarkTheMagician

      Well it would be less than with the equivalent amount of gasoline because propane has less energy per unit of volume than gas does. Although propane does have its benefits as well, such as indefinite shelf life, less pollution etc. In short, propane generators are great, but gas-propane generators are better.

  • Joseph

    Nice pictures,

    Just did a similar conversion. Instead of cutting back the plastic/metal air filter cut the generator support. It is not as pretty but the filter is important and a steel brace was easy to cut and bolt on. I used a steel L that gives it more strength and is pre-drilled every half inch or so. Cut it in 30 seconds with a power tool. Could even mount the regulator on the L brace but it poked out too much then. Good luck to all. Instructions in these kits are vague to avoid potential lawsuits.

    • Kvr28

      Thanks Joseph, agreed, the directions could be a little better. We are debating about whether or not to cut the downtube and trying to find a replacement cover. It is very important to keep water out of the carb, but we have a generator room where this sits so it’s never out in the weather. Other issue is we can’t find a cover anywhere, so I am going to try and JB weld it back together

  • Don

    Kvr28… If you haven’t already cut the frame pipe check to see if there is room to drill new holes at the generator mounting / frame connection (bottom side of the generator/ frame ). I was able to drill two new frame holes 3/4″ back (one side of the frame is slotted) and slide it away from the frame pipe. It is a more professional looking job.

    • http://thehomesteadingboards.com Kvr28

      Good idea! Thanks Don!

  • tab93

    thanks for your posting, i have concern about cut the frame, if we use a thicker venturi then i am sure we can save the generator pipe to cut. when we cut the pipe its more vibrate, and i feel its not good for genset.
    i recently saw a new conversion kits maker amazingly good price and i found its venturi is much less in size, so i am sure its take less space and air filter assembly may fit normally.

    • Mike

      I read your reply and I am wondering if you could give me the name of the other Conversion Kit manufacturer? I’m always interested in saving a few bucks when possible. Thanks.

  • abm

    Thanks for your writeup. please what is the regulating pressure of the tank pressure regulator and that of the engine pressure regulator.

    please, i am asking this cos i ve tried to fabricate my own engine carb adaptor and now what i want to know is the working pressure of the regulators so i can purchase from hardware stores locally here.

    i will also be ok with the ones imprinted on the body, if u dont mind.

    thanks

    • http://thehomesteadingboards.com Kvr28

      Let me look for that for you