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Old 09-16-2019, 01:58 PM
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2 Carb Engine Fuel Line Plumbing

Looking for the best practice to connect fuel lines to a Quad with 2 carbs.
Its a 3W 220.

Do you run a Y connector or what is the best practice?

I see on AIs site they sell tanks and plumbing kits and they show one for 4 cylinder engines with 2 carbs that includes 2 clunks and 2 separate lines, one to each carb. Im not sure I like the idea of 2 clunks.

Looking for best method(s).

Kind Regards,
Ken
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Old 09-16-2019, 04:22 PM
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How do you want to plumb it?? If it were me, I would run 2 tanks. You can monitor fuel consumption easier that way, see if 1 cylinder set is running richer than the other......
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Old 09-16-2019, 07:27 PM
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Bunny, Thanks for the reply.

I have heard that you intentionally run the Back cylinders a little richer.
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Old 09-16-2019, 08:01 PM
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Slightly, maybe 1/16 turn. But I dont fly 4 holers, all 2 holers.
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Old 09-16-2019, 08:29 PM
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keep those rear cylinders cool and don't run too lean
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Old 09-16-2019, 09:12 PM
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Tee in between carbs one tank one clunk one fuel line is how I would do it.. Keep It Stupid Simple (KISS)
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Old 09-17-2019, 07:38 AM
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Thanks All for the responses.

AirBoss, Agree !

3DJP: I like that concept. I wonder if I should run 3/16 ID from tank to T, then 1/8 to each carb, or is 1/8 all around adequate.
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Old 09-17-2019, 08:53 AM
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1/8” all the way around is the way I would head... I don’t think there is any reason to change sizes.... I would think 1/8” will b adequate.
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Old 09-19-2019, 11:02 PM
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not that this is the way to do it, but I have done it this way on a quad and over 800 flights, and works well.


this is the system:
1. 64 ounce tank, juicy juice bottle, clear plastic
2. PSP cap
3. a 4 line tank
4. one vent on top
5. cap has three taps, one is the original from PSP, then I drilled and tapped two more.

6. from the cap, we have two clunks and a 4th line is for the fill.
7. each carb has its own clunk.

I avoid using T's

now, if you can find one, you can do a simple one clunk tank, but use a "Y" instead of a "T".

Some will say a "T" works just as well.

But I believe from a flow perspective, a "Y" would be better.

I personally avoid using anything between the tank nipple and the carb nipple, to avoid air leaks and air bubbles into the carb.

Anyways, hope no one takes offense to anything I wrote.
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Old 09-20-2019, 06:22 AM
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Your stuff makes way too much sense, you'll soon be band by the warriors...

Scott
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Old 09-20-2019, 07:48 AM
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I use a separate tank for each carb on my Dalton with a DA200. I didn't use Fortitude tanks (used two 34oz tanks from ExtremeFlight), but I followed their recommendation. It's working extremely well.

FYI, you will definitely see the tank for the rear carb burn slightly more fuel per flight. The tanks will even out when you fill if you plumb as below.

From the Fortitude site:
"These can also be used together if 64 oz's is needed. Use part #FORA1005 Tee Fittings 1/8" to plumb them together. Tee each vent line, fill line, and clunk line to each other. Then plumb your lines to the normal locations as if they were off a single tank. If you are using a dual carb engine such as a DA200, then you do not have to tee the clunks. Use one clunk line for each carb. The vent and fill fittings keep the tanks fuel level even during flight. Note this is the only approved method of plumbing two 32oz tanks to work in unison. If you plumb them any other method it will damage the tanks. Yes we have tested this and it works perfectly. In fact Andrew Jesky won the 2011 and 2015 Tucson Aerobatic Shootout using this very setup."
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Last edited by gobigdave; 09-20-2019 at 12:25 PM. Reason: Added photo
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Old 09-20-2019, 12:02 PM
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THANKS SO MUCH FOR THE INFORMATIVE RESPONSES!!

ORTHOBIRD, Really appreciate your taking the time to upload pictures.
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Old 09-24-2019, 09:41 AM
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GOBIGDAVE, THANKS for taking the time to post a reply and the pic. I have read your post and studied the pic, & I can see how this set up would / will work

I like this set up also for those times I am breaking in a new engine and would like much longer flight times. Once engine is broken in I can then go to one normal size tank for a single carb engine like my 3W 170 Comp Twin Spark.
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Old 09-24-2019, 11:59 AM
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I wanted ~64oz tank for my DA200 so I could get 3 sequences in for practice sessions. My original plan was to have two clunks like orthobird, but a single tank that size didn't fit well in my Dalton. However, two 34oz ExtremeFlight tanks fit perfectly. I figure if it works for Andrew Jesky, then I'm good.

Interestingly, two lines saved my plane at the start of the season. One of the line stays I had let go, and one fuel line touched the canister resulting in a small pin hole. Because of where the tanks are, the plane ran fine while upright, but the back cylinders did not get any fuel when I rolled inverted. I would have had a dead stick if I only had one fuel line.
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