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29 votes

Small amount of wrong fuel type put in the tank

The main concern with using petrol in diesel systems is that diesel is used to lubricate the fuel pump, which petrol cannot perform adequately, which will shorten the useful life of the fuel system. ...
Zaid's user avatar
  • 39.2k
27 votes
Accepted

What causes a 20% difference in fuel economy between winter and summer?

Your fuel economy change is caused by the fact you're not using the same fuel. Fuel changes twice per year from summer blend to winter blend and back again causing a change in the Reid Vapor Pressure (...
spicetraders's user avatar
  • 1,533
23 votes

Ford Focus hard to start after fueling

The next time you plan to buy gas, open the gas cap, do not add gas, leave the gas cap open for the amount of time it normally takes to fill the tank, then replace the gas cap and start the car. Hard ...
MTA's user avatar
  • 6,973
19 votes

Ford Focus hard to start after fueling

Modern cars all have what is called the evaporative emission control (EVAP) system. This is a system of valves, tubes, and a charcoal canister that is supposed to capture the excess vapors from the ...
jwh20's user avatar
  • 12.1k
19 votes
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Accidentally put regular gas in Infiniti G37

It isn't going to matter in the long run and shouldn't cause you any issues to run the car with the tank of fuel you put in if that's what you decide to do. Cars don't have an octane sensor. What they ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
16 votes
Accepted

Small amount of wrong fuel type put in the tank

The main problems from misfueling a diesel car with petrol stem from the fact that (as Zaid points out) petrol doesn't provide the lubrication effect of diesel fuel and as a solvent it can actually ...
motosubatsu's user avatar
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13 votes
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Do I need any special maintenance plan for a car only driven a every couple of weeks?

It sounds like you're spot on for your car. Words of advice: If you only want to change the oil once a year, use something like Mobil 1 Annual Protection, which is a full synthetic oil. It's good for ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
13 votes
Accepted

Fuel gauge very slow to come up after filling - anything to worry about?

There's 2 possibilities here. The first is that you have an electro-mechanical fuel quantity meter, and that it may be sticking a bit due to a lack of movement. The good news is it did eventually ...
GdD's user avatar
  • 17.1k
11 votes
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What's the meaning of a "lean" vs "rich" air fuel mixture

I do not know the etymology of these words or the history of their use in the context of air-fuel ratios, although their dictionary definitions (lean [adj.], rich, too bad I don't have an OED ...
Jason C's user avatar
  • 4,890
11 votes

Small amount of wrong fuel type put in the tank

This will not be a problem - in fact, some of the older truckers used to add 2% of petrol to the diesel to help in winter conditions to help reduce waxing of the diesel fuel.
Solar Mike's user avatar
  • 34.7k
9 votes

Best way to repair a rotten fuel line?

To be honest, if part of the fuel line is rotten, I'd be tempted to replace the whole line - chances are the rest isn't far behind... Modern rubber hoses should last a decent amount of time, they're ...
Nick C's user avatar
  • 28.8k
9 votes

Why does "i" stand for petrol?

It stands for Injection as in Fuel Injection.
method's user avatar
  • 2,770
9 votes
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Why does "i" stand for petrol?

The i is a leftover from the 1970s, when a few companies (BMW and Mercedes, notably) started replacing the carburetor on their petrol engines with fuel injection. The marketing department saw an ...
Hobbes's user avatar
  • 4,412
9 votes

Accidentally put regular gas in Infiniti G37

I had a G35. I believe there was language in the owner's manual that said regular gas would not hurt the engine but you would not get full performance.
Ross Millikan's user avatar
8 votes
Accepted

Why does the engine have lesser pulling strength when the fuel in the tank is lesser?

It sounds like you have a motorcycle with a carburetor with gravity fed fuel line. (i.e. Without a fuel pump of any sort). In those conditions I can see that there is a higher fuel pressure at the ...
zipzit's user avatar
  • 6,569
8 votes
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Thinking of running E85 to clean my Corvette valves, pistons and heads

There are several issues with what you are planning to do. If you haven't done so already, please read this answer I wrote about using E85 instead of non-E or E10 fuel. While ethanol fuels do clean ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
7 votes

Can I use lower octane fuel at high elevation?

You have nothing to lose on a modern engine (except power) Any engine with a knock sensor and computer-controlled ignition timing (e.g. modern fuel-injected designs) should be able to alter ignition ...
Zaid's user avatar
  • 39.2k
7 votes

What's the meaning of a "lean" vs "rich" air fuel mixture

A lean air/fuel mixture is when there is more air than required to burn the fuel. A rich mixture is when there is too little air for the given quantity of fuel. The ideal mixture, where there is ...
Steve Oakes's user avatar
  • 1,096
7 votes

Why isn't injection managed to use the entire intake stroke?

Keep in mind that at high loads/WOT, the injector may be open nearly constantly - during all four strokes. (Injector Duty Cycle >90%) In fact, many systems switch from sequential port to bank and ...
SteveRacer's user avatar
  • 12.4k
7 votes

Ford Focus hard to start after fueling

I had these exact symptoms on a turbocharged Subaru, and the problem was the Purge Solenoid Valve was stuck open. In modern EVAP systems, instead of venting fuel vapour to the environment, there is a ...
Chuu's user avatar
  • 171
6 votes

Electrical issue in vehicle - fuel gauge drops to zero when horn is activated

Theory 1 From your wiring diagram the horn relay has only 3 contacts; 12v, horn, button. This layout dictates that the horn button should ground the horn relay and not send it 12v. This is because ...
vini_i's user avatar
  • 16k
6 votes

How long can "Stabil"ized gas stay fresh? and can it be improved?

STA-BIL advertises gasoline integrity for 24 months It seems you have exceeded the advertised lifetime of 24 months by 12. Action Items Drain all fuel from the gas tank, fuel lines and fuel pump ...
DucatiKiller's user avatar
  • 32.9k
6 votes
Accepted

2015 Honda Mobilio - Car shakes when started

If I had to guess this sounds like a four cylinder engine, with one or even two cylinder's misfiring. Best guess is a problem with either a spark plug wires, or an ignition module. I'm looking at ...
zipzit's user avatar
  • 6,569
6 votes

Engine Size and Fuel Consumption (cost of driving Audi TTS)

According to a Google Search, his car should get 23 MPG city, which would cost about £3.82 for a one way trip (average £1.01/litre). To figure this out for any car, first do a search to figure out ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
6 votes

Can not fill gas into tank for 2004 Honda pilot

This could be a bad vent valve or a blocked vent hose located near the vapor canister under the vehicle. As this article states, A clogged up vent valve can cause trouble filling the gas tank. ...
CharlieRB's user avatar
  • 9,015
6 votes
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How to determine injector size for custom engine?

Assuming this is for a naturally-aspirated application, your calculations are reasonable. I think you just missed dividing the value obtained by the number of cylinders. Usually 2.5 L engines have ...
Zaid's user avatar
  • 39.2k
6 votes

Best way to repair a rotten fuel line?

I've had to deal with rotten fuel lines on my '94 Nissan. Took me a year to find a suitable solution. Like you, I was considering steel lines to replace the entire thing, but the steel lines I found ...
tlhIngan's user avatar
  • 12.2k
6 votes

Why isn't injection managed to use the entire intake stroke?

Consequently, you get a superrich part of mixture together with just air in the cylinder. These still have to mix/homogenize in the cylinder to get a good combustion. This is already handled by both ...
Zaid's user avatar
  • 39.2k
6 votes
Accepted

Why Ride by wire when the fuel injector is there

The difference between FI and Ride by Wire Fuel injection means that the flow of fuel to the engine is controlled by the ECU, as opposed to a carburetor. (of course, there's more to it than that) ...
justinm410's user avatar
  • 1,742
6 votes
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How Long does engine take to relearn lean condition is resolved?

If the codes were truly cleared, you still have an issue. The fact that they took 100 miles to reappear is a good indication that the codes were cleared correctly, and you still have some sort of ...
SteveRacer's user avatar
  • 12.4k

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