Questions tagged [fuel-system]
Fuel system covers the components of a car responsible for fuel delivery; tanks, pumps, filters, pipes. Questions on carburettors and injection systems have individual tags
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How long does it take for gas to go bad?
Approximately how long does it take for unleaded gasoline in the tank and fuel lines to become unusable in a car that is not being used? What causes this, and what can be done to prevent or remedy ...
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Symptoms of Lean or Rich carb settings on a motorcycle
I have a 1981 Yamaha XS650. I recently put in K&N stock replacement filter (ie, they are in the airbox and conform to the size of the original), however they may be leading to a leaner mixture ...
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What are the benefits of premium (high octane) petrol?
Here in the UK it's common for petrol (gas) stations to offer both regular and "premium" unleaded petrol. The premium stuff is (naturally) more expensive, and I've often wondered what the actual ...
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Will higher octane fuel improve gas mileage?
I've heard from some people that high octane fuel will increase gas mileage. Around here, we have the basic unleaded(87), mid-grade(89), and premium(93 or 91). I've been using the basic 87 unleaded ...
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What is seafoam? What does it do? How do you use it?
Mech's seem to get a real rubbery one about Seafoam.
Is it just fuel additive, like something similar to Lucas Oil?
Do I just pour it into my gas tank as a gas treatment?
What will it do/help ...
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Why is the engine on my Royal Enfield Classic 350 shutting down?
After travelling 7-8km on my Royal Enfield Classic 350, the bike acts as if the fuel is finished & the engine shuts down, but it starts again when I pull the accelerator.
What could cause this ...
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Does the amount of fuel in the tank matter?
As long as there is some fuel in the tank, does the fuel level matter? In other words, is it advisable to make sure the tank is mostly full most of the time, or is this just silly? In other words, are ...
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LTFT and STFT values are off and don't make sense
Car is a 2015 BMW M5 and it has an aftermarket CAI and a catback (slip on) exhaust. No other performance mods or tunes.
About 6-7 months ago, I bought a Kiwi OBD-II reader, simply out of curiosity ...
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What happens if you put the wrong kind of gas in your car?
I (like most people) just use regular unleaded gas in my car and always have. But once I accidentally put in the premium kind, mixing it with the unleaded that was already there, and I thought for ...
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how to optimize fuel consumption by changing the rear differential ratio?
Is it possible to improve the fuel consumption (decrease it) in my van by changing the rear differential ratio? I would like to optimize it for low-speed driving about 40 km/h (25 mph).
Is it true ...
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Difference between high octane and low octane?
What is the difference between high octane and low octane fuel? I'm not asking if one is better than the other for my vehicle, specifically, but rather what occurs differently both scientifically and ...
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How to improve fuel economy in high-mileage car?
I'm driving an 2003 Acura TL 3.2 with 177K miles on it.
I bought the car with 110K miles on it.
It seems to me that the car is not getting the same fuel economy that it did when I acquired it. I ...
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Motorcycle Four Body Carburetor Synchronization Balancing
I would like to adjust four-body carbs by myself, in order to avoid spent money every time.
What are the basic rules, tools and secrets of synchronizing multiple carburetor bodies?
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Why does a diesel sound like that?
My car is in the shop for a repair, and they gave me a loaner. It's a Chevy Cruze Diesel. Sitting on the driveway, my wife said, "It sounds like a truck". It does. So what exactly it is about ...
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Lean Fuel Code on V10
I have 1999 V10 Ford chassis on a 2000 Coachman motorhome. Engine starts great when cold, runs great, idles great, no skipping, missing, etc. Problem is that after driving more than 30 minutes or so ...
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Calculating fuel flow rate through obd || sensor not supporting 015E and 0110 commands
I have been working on a project where i want to calulate fuel flow rate using data from the obd2 sensor. The car on which i was testing didn't support the pid 015E which is for fuel flow rate. Then i ...
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When given a choice between octane 89 and 93, which should I choose?
I just recently got a 2005 Volvo S40 with a turbo engine; I want to take good care of it, so naturally, when the instruction manual recommends 91 octane fuel but says it takes a minimum of 87, I have ...
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What does Honda's 'Econ' button do? Does it truly improve fuel efficiency?
I recently bought a Honda Civic that had this in the car:
I have no idea what it does, and how it's supposed to help. Even Honda's website is ambiguous, just using a lot of fuzzy words to describe ...
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Can I use lower octane fuel at high elevation?
Here in Colorado, gas stations sell "regular" gasoline which is rated at 85 octane ((M+R)/2). In most of the rest of the US, 87 octane is the lowest grade available. (As noted previously, higher ...
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Cleaning fuel injectors?
I took my car (2006 Honda Civic) to firestone to get an oil change and they told me I should get the fuel injectors cleaned. I was in an Advanced Discount Auto Parts store the other day and I noticed ...
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Are fuel system cleaners (like Gumout) worth using regularly?
Are fuel system cleaners (like Gumout) worth using regularly?
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1993 Merc 300SE always stalling soon after startup, fuel pressure tests > 50psi
From the moment car starts to the moment engine stalls, which is about 40 - 60 seconds, fuel pressure is always above 50 psi.
Can I safely conclude stalling is not caused by fuel system problems?
I ...
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Can I use ethanol instead of petrol in my car?
I have a 2001 Ford Focus (EU/UK spec) and I'm planning a road trip to Europe. My research shows that they serve up something called E85 at their petrol pumps in addition to petrol and diesel.
I've ...
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Do I have a fuel pressure or injector problem, or am I just chasing ghosts?
I just did a fuel volume test on my 98 Mazda 626 2L GF. According Tim Giles book Automotive Service:
Each injector is energized for 15 seconds... Variations of more than 5 ml calls for replacement ...
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Do fuel pressure regulators allow some fuel to flow even when not turned on?
I'm completely rewriting this question since I really wasn't clear before.
When discussing a fuel system with a return line and a vacuum operated fuel pressure regulator such as this:
Where it says "...
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Fuel Consumption and other Fuel related data from basic OBD-II parameters [duplicate]
I want to know how can i obtain the values of Fuel Consumption, Fuel Economy and other fuel related information from basic OBD-II parameters like Vehicle Speed, RPM, TPS etc. I have noticed that not ...
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OBD-II Fuel type and level of Monofuel Cars
I'm making an application like Torque and i have some issues with commands of Fuel Type and Fuel level with cars that use only one type of fuel like, Only Diesel or only gasoline.
With car Bifuel ...
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Why should the fuel petcock valve be turned to “Off” position when not using the vehicle?
It’s mentioned in the user manual of my motorbike, that when not using the vehicle, I should turn the petrol tap (the one that has three positions “On”, “Off” and “Reserve”) to “Off” position. I don’t ...
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How to properly dispose of old fuel?
I have some old 2 stroke mixed gas I need to get rid of. This could also apply to old fuel removed from a sitting car or any vehicle for that matter. What is the proper way to dispose of this? Are ...
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How do I safely siphon gas from a tank?
Our 2003 Windstar was recently totaled in an accident (everybody's ok). This happened the day after we filled the tank.
Before we hand over the car to the insurance, we'd like to get the fuel out of ...
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Lada Niva 1700 Carburetor Model
The compression is good and does not burn excessive oil .Fuel consumption has dropped from 8 kilometers per liter to 5.7 kilometers per liter.Same driving cycle same location. What should I look for?
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What is the yellow precipitate in my outboard's carburetor?
I've got a 2008 Tohatsu 9.8 HP four stroke outboard. My low speed jet keeps getting fouled and on several occasions, I've found yellow almost crystalline "growths" for lack of a better word inside ...
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What are the causes of fluctuating intake manifold vacuum
I have a 2005 Honda CBR600 F4i which suffers from occasional hesitation at low rpm when accelerating. I also get occasional fault codes from the ECU indicating a vacuum leak.
Today I connected a ...
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Doing my own fuel induction service - how to, and how difficult?
I was recommended to get a fuel induction service for a 2002 V4 Camry, and am considering doing it MYSELF. The reasons for considering this are:
My car idles a bit rough, especially when the AC is on....
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What is the "Activated Carbon Cannister"?
Why do I have an "Activated Carbon Cannister" in my unleaded/petrol car?
What is it's purpose?
How does it work?
Do I need to do anything to maintain it?
I would like a general answer, but my car ...
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What happens when you run out of fuel?
My question is specific to diesel or gasoline (petrol) engines.
Many people told me that it is very bad to run out of diesel since it can damage the engine and it's difficult to re-engage it ...
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How to know how much fuel is left when the light turns on
In general, where can one find information about the quantity of fuel that is left in the vehicle's tank when the warning light turns on?
More specifically, in a Suzuki Swift GLX (auto) 2010 model?
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2009 Hyundai Sante Fe - gas smell in cabin after replacing fuel sending unit. has been repaired 4x's now
Fuel sending unit replaced. Since then it has gas smell in car. It has been redone by mechanics four times now but still has a gas smell when the gas level is in the first quarter of the tank.
Cap ...
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Why does my gas not fill all the way?
Same as the title. I have filled twice, different stations, both fill to just over 3/4 and stop. I am not sure if this is the gauge or something with whatever magic tells the pump to stop. Is there ...
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What are all the different types of fluid in a car and a short summary of their use?
A fluid is defined as anything that flows, hence for our purposes a gas or a liquid. I know that there is fuel, engine oil, engine coolant and brake fluid. Also air is normally taken in through a ...
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Vespa PX 150 Fuel and Carbon issue
I am using Vespa PX 150.It is using Contact Point system. The issue is it is consuming fuel more than average and the plug is full of carbon after approx 50 Km.The engine not start unless I clean the ...
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Why is there a hissing noise when I open my petrol cap?
When I fill up with fuel, there is often a loud hissing noise, as if you are opening a bottle of fizzy drink or something whenever I unscrew the petrol cap.
It also seems like there are vapours ...
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Are there any modern diesel engines that require electricity to continue running?
I was reading this question about an owner checking the alternator by disconnecting the battery, which is an easy way to validate on a gasoline engine. The single answer assumes that the OP is ...
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Does the tachometer provide any indication of fuel usage?
So, I'm driving along on the highway with the A/C blasting when I notice the price of gas. It makes me think, "what can I do to increase my fuel efficiency?" Some of the tips I've heard have included ...
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Cranks, but slow to catch. Dies after starting
Recently my 2007 Mazda6 (2.3L I4) has been taking longer and longer to start in temperatures colder than about 5 F (-15 C). The car usually sits overnight for about 12 hours after I get home from work;...
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How to calculate fuel consumption and CO2 emission on flex fuel cars using OBDII data?
Here is the thing: I'm trying to estimate the fuel consumption of cars using OBDII data. It's quite simple if we can treat each fuel and its stoichiometric air fuel ratio separately, but when it turns ...
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What would cause a car to lose power a few seconds after starting, then run normally?
I start my 2003 Honda Civic each morning and drive to work. A few hundred feet down the road, the engine will sometimes behave as though it is running out of gas and lose power momentarily. It doesn'...
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Intermittent stall at idle
I have a 98 Saturn sw2 with a recent problem. Two times now it has stalled while idling and when it doesn't stall it floats near 500 rpms (Usually 750 - 950). The first time, it would start and just ...
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Does the a gasoline or diesel engine supply fuel at high speeds when not pressing the pedal and more
Let say I directly connect a small engine to my bicycle, and that I'm superman who can overcome any force.
Then I start cycling (using my legs...) - the engine starts to rotate, even though I haven't "...
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Car stalls when braking (VW Mk1 Golf)
I have bought a Mk1 Cabriolet that has been sitting for over a year. I am trying to get it road worthy.
So far so good, but I am having an issue with the engine and braking:
The engine stalls when I ...