How To Put Two Air Tanks Together

Assembling the Fuel Tank

Note: Information contained in the instructions supersedes information presented here. Before assembling the fuel tank, exist certain to review the instructions that came with it.

It is not difficult to assemble a fuel tank just if it is not assembled properly you can expect a great deal of frustration at the field.

All R/C fuel tanks assemble in a like manner and these bones philosophies apply to all tanks:

E'er deburr metal fittings to forestall cuts in the silicone fuel line.
Ever set up the feed line within the tank so that it is approximately i/4" from the rear of the tank. Concord the tank vertically so that it is back-lit to assist you run into inside of it.

The feed line should hang direct down. If information technology clears the back of the tank by 1/four" so it will exist slightly farther away when it is resting on the top or lesser of the tank. This prevents the fuel from surging into the line and flooding the engine when throttle is practical (and so I'thou told).
Ever disassemble a tank after initial associates and wash the tank and fittings out thoroughly to remove metal shavings and other crud. Be sure to run h2o through the brass tubing and pick-up line. If you accept an air compressor then blowing some pressurized air into the tank (without the stopper assembly in place) and through the feed lines will aid remove any particles.
There is normally a third pigsty in the stopper that is plugged. Don't open this hole unless you plan to employ a iii-line fuel system.

Fuel tanks come with brass or aluminum tubes. The feed line should only extend in to the tank well-nigh 1/2". That gives plenty of tube for the fuel line to grip. If the metal tube is inserted too far into the tank then information technology will inhibit gratis move of the feed line.

The vent line should be slowly bent to 90�. I mostly brand the bend far plenty from the end of the tube so that information technology is too long. And then I cutting off the excess so that the vent clears the top of the tank past 1/sixteen" to 1/8". Y'all tin either buy a tubing bender or use a variety of methods to continue the tubing from collapsing when yous curve information technology. Some people fill the tube with sand or feed a weed-eater line into information technology while bending.

I purchased a tubing bender in Germany that works well. The tube must be pulled while angle to foreclose information technology from collapsing. Soft tubing can exist bent effectually your thumb if you bend the tubing slowly. The tube does collapse slightly, but it nevertheless passes fuel hands.

Do Not utilise a razor saw to cut metal tubing (unless y'all don't mind ruining the saw).

The 2 easiest means to cut the metal tubes is with a small tubing cutter (1000 & S) or a moto-tool with a cut-off cycle. To deburr the tubes, turn a counter-sink by paw in the end. The idea here is to remove the burr inside the tube - not to sharpen the tube. Use very fine sandpaper around the outside.

What I normally do is put a cut-off wheel in my moto tool and then spin the tube at about a 45� angle against the wheel. Check your work carefully because it only takes a small cut in the fuel line to make your engine run erratically and make y'all pull your hair out.

Fuel Tank Stopper Assembly

A clunk assembly for a two-line model airplane stunt fuel tank.

This is how a stopper associates should await when it is assembled. The feed line made of fuel tubing is flexible.

The clunk on the end of the line is heavy and ensures that the choice-up is ever submerged in fuel.

The feed lines should extend about i/2" from the front end of the tank as well. If the lines do not route in a fairly straight line from the tank through the firewall, and so you may need to bend the metal tubes in the general direction of the exits on the firewall. This will help foreclose the fuel lines from kinking in the tank compartment.

The fuel tank is sealed through the use of a rubber stopper. On the front and back of the stopper are hard plastic or metal plates. The metallic tubes pass through the plates and the stopper.

A spiral goes through the center of the front plate and stopper and threads into the back plate. When the screw is tightened, the stopper compresses and expands sealing the tubes and the front of the tank.

You will observe that there is a third hole in most stoppers that is plugged. Do not utilize this hole or open it unless you plan to make a three-line tank. It is easiest to slide the tubes through the stopper if you spit into the stopper holes kickoff.

A common mistake you can make when assembling the tank is to over-tighten the stopper bolt. The stopper is sealed when it bulges and it will non come up loose. Just considering y'all can turn the contumely tubes in the stopper holes does not hateful they are not sealed. If you over-tighten the stopper it is very probable that the tank will split and spill fuel all over the inside of your aircraft.

Testing the Tank for Leaks

Put a fuel line on the vent and another line on the feed. Plug one line, put the tank nether water and blow in the open tube. If you encounter air bubbles coming from anywhere in the tank information technology is non sealed properly.