How Do I Install An Oil Dispenser Inside A Gas Tank

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I've been filling my four-liter Happy Time fuel tank at the gas station. Pour two quarts fuel in, pour oil, then fill up with gas. Sometimes, I need three hands to do this, and always worry about spilling oil or overfilling.

I'm thinking of devising a measured container below the neck of the fuel tank. That way, I can just pour the oil into the tank without pre-measuring. Then the gas pouring into that measured oil container will ensure a very good oil/fuel mix. I always worry about a poor mix. On my first attempt to fill my tank. I forgot to shut the petcock and poured the oil in first. The oil flowed directly into the large FRAM automobile-type fuel filter. When I started the engine, it fouled and died within seconds. To resolve the issue, I had to plug the gas cap and turn the bike upside-down. This allowed the oil to flow back into the petcock and tank. After closing the valve, I flipped the bike over and stirred the fuel mixture with a pair of chopsticks. Minutes later, the bike's engine cleared up and I rode home. Since the oil/fuel mix was probably way off, I drained the gas and mixed another tankful.

So, to keep this from happening again, I'd like to have a 1.875 ounce cup below the tank's neck. I've noticed that it's too messy to fill four quarts into the fuel tank, so I'll pump in three quarts instead. That 1.875 ounce receptacle is perfect for 50:1 oil/fuel mix. When running an engine using a 25:1 mixture, I simply fill the oil cup twice. If situated directly under the gas cap, oil/fuel mix will be excellent. Besides, the cup will also keep gas from sloshing out the gas cap's vent(I've also been having slosh problems).

Anyone ever thought of installing a measured oil cap in their fuel tank?

Thoughts?
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Honey, it's just a bicycle. and i REALLY need it to excercise, and to ride it to work.(hehe)

dmb said:

before oil injection yamaha's had a little upside down cup on the gas cap. you would fill the cup for every gal of gas. them were the old 20-1 days. now days with up to 100-1 you would have a pretty small cup! oil syringe's are popular now too [ya gotta carry oil why not in the syringe.

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Two reasons why I want an oil dispenser in the tank:

First, I need three hands and a leg to brace my bike, pump the nozzle and pour the oil intermittently into the tank.

Second, syringes are messy, especially after use. I reuse the 2.56 oz. oil container, but I need to dig it outa my backpack. I always worry about spilling/overflowing gas and tipping the bike over, while monitoring the gas pump and small HT tank. I also worry about the plastic oil container breaking inside the backpack, contaminating everything.

What I envision is a small built-in container, or one mounted externally with a screw-on cap and a petcock. It could be filled a few days before. When fillup time arrives, simply lift gas cap, insert pump nozzle, turn on petcock. When finished, shut petcock, replace cap. Refill oil dispenser anytime before the next fillup.

Thoughts?

Thank you for your simple solution. However, I want it simpler, almost automatic. I've always had a two-gallon gas can handy at home. Pour oil into container, drive to gas station, fill container, return home, fill the bike's four-liter tank. However, nowadays, I don't like to keep gas at home. I live in a walkup apartment. The fillups at home are too messy. My bike is such a regular commuter that I like gassing up at any service station. If I run outa gas in town, I simply pedal to the nearest station and fill up the tank.

BTW, my fuel tank sits atop the rear rack.

No, I will not consider swapping in a 4-stroke engine onto my bike.

I carry an 18-oz. aluminum fuel cylinder in the bike's bottle cage. I COULD carry 1.875 oz of oil in this container. At the gas station, I could partially fill this container, mix thoroughly, then pour it into the tank while pumping gas. This would make for a better mix, instead of pouring oil straight into the HT fuel tank.

This is a good alternative, unless someone else has a better method of a passive oil dispenser. I'm looking for an idea where there's very little chance of spilling oil or fuel.

Yes, I know you hadn't mentioned a 4-stroke, but someone else might be thinking about suggesting an engine swap. It would seem slightly logical to run a 4-stroke, but not for me.

Originally, I WAS thinking about a tiny cup. Then I thought about sinking an oil dispenser into the tank, like a soap dispenser in a dishwashing machine. Now I want a hands-free oil container, probably mounted just outside the tank, maybe with a short connecting hose and a petcock to the fuel tank.

HseLoMein said:

too bad they didnt have a oil safe plastic ball that dissolved in gas and will not fown things, cause then you could fill those balls with the required amount of oil, and just drop it in the tank as you fill it, then shake. That would be awesome

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I totally agree!

Maybe like an Alka-Seltzer tablet, saturated with the right amount of oil. Fill half a tank, add tablet, finish gassing up. Pop-Pop, Fizz-Fizz, in a minute or so, it's a perfect mix.

The "squeeze-bulb" syringe is a good idea. The squeeze is more stable than a "thumb push" needle syringe.

I am wanting a metal vial. It should be solidly mounted atop the HT tank, equipped with a petcock to slowly drip a measured amount of oil into the gushing fuel.

Rube Goldberg device? Yes, since I'm cheap and am looking for a container that'll bolt onto the tank.

HOWEVER, a fabricating shop could do a professional job welding on a steel pocket which would hold three ounces of oil. Then a petcock would screw onto the pocket and regulate oil dripping into the HT tank.

That's a great deal!

Here's one:

STEAM ENGINE DRIP OILER, HIT / MISS OILER #DO52 | eBay

I think a 2-ounce oiler would be good for 100 ounces (3 quarts, 4 ounces) to mix with.

Do you know how thiese oilers work? What controls the oil drip? Am I right to assume that this screws into a non-pressurized oil line?

Why is there an open area between the oiler and the threaded part of the fitting? Is that so you can watch how fast the oil drips into the oil line?

I would have a threaded fitting brazed/welded to the tank, near the gas cap. Then I would fill the oiler the day before filling gas and install it onto the tank. Upon reaching home after filling the tank, I'd remove the oiler and plug the tank's fitting.

My HT tank sits on the rear rack, while my engine is frame-mounted. On my next Project 29er, the engines will be rack-mounted, and the HT tank will bolt onto the bike's top tube. If the brass drip oiler could be protected from falls, I'd leave it permanently mounted.

From what the pictures show, it is a beautiful piece of old-fashioned engine component.

http://cgi.ebay.com/STEAM-ENGINE-DR...ltDomain_0&hash=item27bb205959#ht_1576wt_1139

As pretty as this brass/glass piece is, it's not gonna work for me.
It's a dripper. I need something that has flow capacity, not in drips per minute, but like in quarts per minute. The two ounces should be able to flow into the tank in less than 10 seconds.

Methinks something like this automotive gas filter would work very well:
http://cgi.ebay.com/ebaymotors/VW-B...dZp5197Q2em7QQitemZ300348236970#ht_1164wt_939