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11

There are two possible explanations: If the fuel cap does not form a good enough seal, the fuel injection system may experience problems with drawing fuel from the tank. On newer cars many of them have a fuel cap sensor to detect if the cap is not screwed in. This is related to emissions, although i am uncertain how. I know when I get my yearly emissions ...


9

Look up in your owner's manual how capacity your fuel tank has. Next time you fuel up, take note of the difference. In my car it's roughly 2 gallons (7.5 liters). However, realize that modern cars use fuel as a coolant for the fuel pump and running the tank dry often may damage the fuel pump over time.


8

Despite any opinions of safety it seems that gas tanks are manufactured to not accept more than 95% of their total volume because of regulations. Here is a quote from the US Department of Transportation Federal Motor Carry Safety Administration Regulation 393.67 Subpart E. (12) Overfill restriction. A liquid fuel tank manufactured on or after January 1, ...


8

It might cause issues with the evaporative emissions controls as the tank is currently permanently vented to the atmosphere and that can trigger a check engine light. In general it shouldn't be affecting the fuel mileage, though. The other concern is that you'll probably end up clogging the various fuel filters sooner because the lack of fuel cap means all ...


7

The EPA regulations require that the fuel tank is a sealed system so that no vapors escape. There is an entire system (Evaporative Purge) dedicated to that task. EPA regulations also require that the ECM (Engine Control Module) check they system for leak. When the right conditions are met IE fuel level between 1/3 and 1/2 tank, outside temp 50 - 90 etc. the ...


6

You will likely be annoyingly loud but otherwise fine. As always, you are liable for your own compliance with local noise ordinances. I would recommend that you drive with the windows up until you give the car to the shop in order to avoid any risk of carbon monoxide poisoning. For example, don't drive with the trunk propped open: the low pressure behind ...


6

It's a gasoline vent tube, serving three purposes. Gasoline vapors can be especially dangerous under pressure (pretty much why it is useful), and as the temperature fluctuates it is safer to relieve the vapor pressure than it is to potentially have it build up. The gasoline vapors should preferably not be ejected onto a potential spark source (battery) or ...


5

Carry the fuel in an approved container, some local laws require color coded tanks for gasoline, diesel, alcohol etc. If you must carry fuel in the interior of the vehicle use common sense. Don't smoke, and open the windows to avoid a build up of fumes/vapors. If you are using the fuel to power a lawnmower, generator, etc carry as little as possible for the ...


4

Tire Pressure correct, less rolling resistance. Weight reduction: You, cargo, and extra accessories. The less weight the better the fuel economy. Slow smooth acceleration, no jack rabbit starts Anticipate stops, let off the accelerator early to start slowing down as opposed to keeping the gas on longer and using the brake harder. Eliminate unnecessary ...


4

Motorcycle folks seem to do this a lot, presumably because the gas tank is easy to remove and small enough to manhandle (personhandle?). A Google search produces a lot of results for how to do this, and any of the ways you've heard will probably work well. Here's one detailed list: http://www.mopedarmy.com/wiki/Removing_rust_from_a_gas_tank You have to ...


4

The fuel pump combined with the fuel pressure regulator should take care of any air in the lines. If you don't like the idea of cranking the car continuously until it starts (it would take 3 cycles or so), then turn the key into the "on" position without cranking it. This causes the fuel pump to run, because it primes the fuel system in anticipation of ...


4

To add a little bit to Paulster2's answer the upper and lower Explosive Limits of Gasoline is 7.6% and 1.4% respectively. This means that a concentration outside of those limits will either be to rich or lean to burn. And since Gasoline's Flash point is -45 °F (-43 °C) it's pretty much always putting off vapors, which would push any air out of the tank. It's ...


4

Fuel filler neck or pipe, it connects to a rubber hose (8) that connects to the tank (1). Hose clamps (9) are used to secure the hose. If it come loose from the tank then you need to tighten the clamps. If the filler neck is coming a loose from the fender area then you need to tighten or replace the fasteners there. It doesn't look like it's sold separately ...


4

Interesting issue IF, the internal tubes have corroded within the tank that would be relatively serious. The interesting piece is, how would they corrode. As far as I know, almost ALL the fuel tanks on modern bikes use copper for this overflow. It runs from the lip above the filler point, down through the tank to a nipple on the underside of the tank (or ...


3

Is it possible that the fact that it rained is a coincidence? Could the fuel just be old? If you leave a two-stroke engine sitting too long with mixed fuel/oil in the tank, the mix will lose some of its lubricating properties---sometimes enough that when you try to start the engine it'll run for a moment, then overheat from lack of lubrication and stop. I ...


3

I'd also go with calibrating the existing sensor, but I'd do it the other way around to mac. Start with an empty tank and measure the voltage. add a known volume of fuel, measureagain. repeat until the tank is full. This will give you a series of reference points, and obviously the smaller the volume you add each time, the better the resolution of your ...


3

It sounds like you just don't know the characteristics of the output of the fuel level sender in the vehicle--perhaps learning more about that sensor would solve your problem. In terms of an alternate solution that does not use the fuel level sender, if the vehicle is a modern one with electronic fuel injection, then it is possible to determine the ...


3

This can be caused by a number of things, including: Leak in the fuel tank (loose cap) Leaking evaporator canister (plastic housing in engine compartment or under vehicle, also known as charcoal canister) Plugged evaporator canister - there is a tube that is open to the air that can become plugged Malfunctioning purge valve - valve itself is faulty or ...


3

There is a kit that contains a new sending unit, float and seal. It retails for 239.20 according to gmpartsdirect.com, they will sell it to you for $124.38. There should be an access panel in the trunk under the mat, so dropping the tank should not be necessary. Expect a shop to bill retail for the part plus an hour of labor. You can probably do this ...


3

You could absorb it with a rag. Either put continue to hold the tank upside down and stick a rag in the collar around the opening or hold onto a corner and lower the rag into the tank. Leave the cap off and whatever residue that is left after you pull out the rag should evaporate quickly.


3

I pulled this from the talk side of Wikipedia page on electric fuel pumps, which I think explains it pretty well: I am an auto mechanic who also has a chemistry background. The reason electric, tank- mounted fuel pumps do not cause explosions is that the concentration of fuel vapors is too high to allow an explosive mixture. The volatile (which in this ...


3

There are only two ways I can think of to remove the dent. One is to put a certain amount of water in the tank (off the bike, of course), and freeze it. I don't know what that "certain amount" is, though. If you put too much water in it, it will split seams and such, so proceed at your own risk. A second method is to heat the area up with a blow dryer, ...


3

Its a petrol overflow drain pipe. In case if you fill fuel that overflows it ll be drained through that pipe. it may also have internal connection with a pipe with drains rain water or any water that tries to get into the tank.


2

Fuel level senders, when operating normally, produce a resistance value that is directly proportional to the level of fuel in the tank. The value should change smoothly as the float on the arm goes up and down. You should see no sudden jumps in resistance. If a sender is bad, it can show the gas level as full, empty, or sporadically jumpy. Is this the ...


2

In the UK, most petrol (gas) stations sell temporary fuel caps in the appropriate colour, for very little money. They are universal fitting and usually made of plastic, so just press into the hole making a snug fit. In addition to what Tomo suggests though, I would say that it also depends on the vehicle and the fuel that you use. A big problem for ...


2

Sounds like you are talking about a Vespa PX - according to the manual you should get 260Km on a tank. I think this is if you are a very small Italian and travel at a constant 60km/hr. Specs for newer Vespas like the GTS 250 have to conform to EU measurement standards and therefore are more realalistic. Your 150 km is about what I get for mixed riding - I ...


2

Generally speaking (not familiar with that model), it could be due to: Bad fuel pump (fairly rare, fuel pumps are one thing that usually last forever) Clogged fuel filter (has it been changed recently/ever?) Bad fuel pressure regulator (although, they usually fail the opposite way) Leaking fuel injectors (unlikely, would require a pump that's marginal to ...


2

Look up in your owner's manual and it should tell you how much fuel is left when the light comes on. You can always confirm it by following Parker's answer too.


2

If you perform the repairs yourself the fuel level sensor seems to cost about $100. When the sending unit goes bad the fuel gauge will usually not move at all. It does sound like it could be an issue with the fuel level sensor in your car. Perhaps the float just needs to be adjusted. Maybe someone bent it out of shape when performing a repair. For ...


2

Depending on the class/model, there should be somewhere between 1.5-2.1 USG (~6-8 litres) left in the tank when the light comes on. Here is some interesting reading on this very subject. It seems MB has had a lot of problems with their fuel level indicators. Seems the "best defense" against this is to never let it get below a 1/4 tank on the gauge. Either ...



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