Hot answers tagged

8

Regulations limit the amount of unburnt hydrocarbons that can be released into the atmosphere, therefore fuel tanks on cars now have to be sealed to stop these emissions. The noise you hear is air rushing into the fuel tank, due to the low pressure caused by the use of fuel.


6

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 ...


5

That pipe probably goes to the tank too, it is just there to let air out of the tank while adding fuel down the main pipe. I believe that your additive will be in the fuel.


4

If you have no money, the simplest way to get it fixed is to use a stainless metal screw (or galvanized if you cannot find stainless). Simply screw it into where the hole is at. When you insert the screw, the metal of the tank will form around the screw. This is an "old timers trick". Back in the day when a tank would get some water in it (because of bad ...


4

There is Brake-Specific Fuel Consumption Which is a measure of how much fuel is consumed per unit energy. Another way to look at it is the rate of fuel flow needed per unit power developed by the engine. This information is not something accessible through OBD-II. But it's not very useful in this case Note that MPG remains relevant because it is a ...


4

In the case of topping off, it would make absolutely no difference other than costing you more at the pump. Octane is a rating which would indicate how hard it is for the fuel to burn. The higher the octane rating, the harder to burn. If anything, leaving gasoline for longer periods of time is going to make it harder to burn, thus effectively raising the ...


3

Are these instructions accurate? These instructions sound accurate to me. Would Vaseline-brand 100% pure petroleum jelly (the one used for baby diaper rash) be a suitable "petroleum-based lube" or is a car-specific product needed? Absolutely. And if I use a 100% cotton fabric to clean the top of the gas tank, does this suffice to minimize the ...


3

The level sensor works with essentially sliding contacts. These contacts wear out over time and crud, dirt and corrosion can build up on them. Did i mention that the sensor is submerged in gasoline. Some cars have known problems with level sensors but i'm not aware of BMW specifically having a problem. If you don't want to spend any money this problem can ...


2

I believe you are correct in saying the tubes are inside the tank. What the manufacturers did was ran molded tubing through the tank and it sounds like those tubes in your case have rusted and corroded. What I would suggest in your situation is just plugging the inlet for the overflow by the filler, and the overflow outlet which comes off the tank. You may ...


2

I have seen two things cause this problem. The first is an obstruction in the fuel filler neck. This could be caused by damage or a foreign object logged in the neck. The second is if a EVAP vent solenoid is stuck closed. The evaporative emissions system collects access vapors from the fuel tank in a charcoal canister. To dispose of the collected vapors ...


2

Another concern of leaving gasoline in a fuel tank is that it degrades. If left long enough, it will not burn as efficiently (if at all) and will cause many internal issues. Gasoline in a fuel tank should be good for a minimum of six months before you need to start worrying about anything. Given you are driving the car 2-4 times a month for about 100 miles, ...


2

All modern motorcycles with steel gas tanks have an internal coating that protects them against oxidation (rust). There are many brands of sealer available if the stock sealant has been compromised, typically due to heat or old fuel sitting in the tank for an extended period of time. This google search for 'motorcycle gas tank sealer' yielded these ...


2

Sometimes A float gets "waterlogged" (so saturated with fuel that it just won't float anymore.) The float could be bent in position. Worn tip on float needle Worn o-ring in the float seat Excess dirt and varnish in the carburetor. (Varnish deposits occur when fuel sits too long..) The best thing to do is remove and examine the carburetor. Take it ...


1

As you doubted the trouble was with the float. I would like you to remove the bottom cup of the carburettor and remove the fuel and gently blow some air to the float and to the jet. Make sure not to disturb the Air or Fuel Screw. If you disturb it, it will be the difficult task to tune it back to normal by you. Now gently tap the float and make it free. ...


1

The float lever in your fuel sending unit may have a built up residue on it preventing the float from rising and falling properly. I believe your vehicle has an internal fuel sending unit within the fuel tank. and I believe that your access point for this fuel sending unit is from within the vehicle under the rear seat. This float lever on your fuel pump ...


1

I agree with Paulster2 and George also, but when you can't afford the new tank, a good fix might be a product like JB Weld or some similar product. I fixed a pinhole in a 135 gallon slip tank about 4 years ago with the JB. Still holding. Just do a good job of preparation, sandpaper or whatever you got and try it. Nothing to lose. Hope it works for you.


1

The only advantage I can think of is with a vehicle that has carbs. Often (but not always), the higher octane fuels have less Ethanol. Ethanol left sitting on carbs leads to fouling. So, higher octane, which may have less Ethanol, gives you a better chance of not having to deal with fouled carbs down the road.


1

I'd suspect some kind of blockage or restriction in the filler - possibly the hose itself has partially collapsed, or the non-return valve is stuck, stopping the fuel from running down into the tank properly - by the time you got to the second service station, the fuel had worked it's way past the obstruction into the tank, so you could do it again.


1

Not sure if this really answers your question, but I thought I'd give it a shot. There is an electronic circuit between your fuel tank and the gauge. This circuitry does nothing more than reading the voltage coming from your fuel tank level sensor and sending this voltage to your gauge. This voltage should be stabilised by a regulator. This circuitry might ...


1

Sounds to me like you have a hole in your gas tank. The fuel is pouring out and running along the frame of the vehicle. If the fuel pump is not on (ignition is off) no electricity should make it to the fuel pump. The pressure in the fuel lines would go away and the pump would stop any siphoning action. Sounds like the shop tried to fix your tank and ...


1

i know this problem your evap canister needs to be changed its full saturated with fuel it cant take any more vapors in it which will cause a very rich mixture in you manifold and probably will stall the engine you can test this by unplaging the vacuum tube to the canister and plugging it with a screw or some thing if the engine dosent stall then just change ...


1

I do not recommend modifying your fueling system due to the extensive design that goes into these types of applications. The tank, along with the supply and return systems have been designed to not only accommodate 5% expansion space but also to adequately supply fuel to your engine as energy and lubrication. In diesel applications, hot fuel is also ...


1

All the analog gauges work by sensing varying resistance by a float sensor which eventually results in thermal conversion or Voltage mapping to fuel levels. The accuracy suffers due to non-linearity of these float sensors.The methods mentioned by Nick & Mac are right here; but it gets very tedious if your demands of accuracy are nearly 1% of total volume ...


1

There is another important function of the fuel cap, it helps control flammable vapors. An example would be if you parked a car inside a hot garage baking in the summer sun. There would be an ignition risk from the enclosed place filled with gasoline vapors leaking out of the open gas tank.


1

Usually Vespa PX will give approximately 30-35KMPL, since you are getting 25KMPL I recommend you to check the air filter and the spark plug. This particular model is not available in our country, so I may be wrong somewhere. But I am giving you the basic tips which is suitable for all the automotive. Check the air filter if it is too much dusty or ...



Only top voted, non community-wiki answers of a minimum length are eligible