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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21 views

05 VW Passat Turns over, won’t start

this car has been a problem from the beginning... engine light on, codes say misfire. Started overheating so I replaced thermostat. Still had hardly any power or acceleration, engine light flashes a ...
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3answers
42 views

2000 Ram van 3.9l overheated and now runs very rough

First, the belt came off and damaged a vacuum valve inline on the heater core hose. Valve broke and was replaced with straight half-inch pipe temp. But I still don't have heat. Then the upper radiator ...
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1answer
20 views

Does the fuel pressure regulator ever go out of calibration?

On GM 3800 SFI engine, does the fuel pressure regulator ever go out of calibration? My FPR does not leak, can I assume it is good? The fuel pressure rises with RPM and goes lower at idle. Is that all ...
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48 views

Is it possible to actually run on fumes

Regarding the phrase "running on fumes", if a tank is empty, will the engine get any power at all from fumes left from petrol (I don't mean drive it any distance), or is it just an ...
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28 views

I have a 1999 yamaha r1 and it bogs out really bad

So I've cleaned the carbs twice on this bike and its like it's not getting enough fuel because it will only run on starting fluid and I've cleaned the tank and got new hoses and still the same problem ...
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1answer
61 views

What do you think of these spark plugs?

Still trying to diagnose an erratic positive fuel trims. Next step will be making sure that the lean condition i have is caused by less fuel delivered or weak spark not a vacuum leak. I pulled spark ...
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1answer
28 views

Fuel System Diagnostics

If I have a fuel system problem, I'm wondering what I'd need to do to be able to fix the issue. I don't want to be replacing parts just to see if it would now work. I'd rather take diagnostic steps to ...
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1answer
48 views

Lowest Fuel trims achieved only in the 1200-1500 RPM range?

This car still driving me crazy. I wrote here before about getting the code P0171 and some suggested a vacuum or exhaust leak. I sprayed some flammable connector cleaner around the intake manifold, ...
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2answers
121 views

How many miles could you drive a diesel car with petrol before noticing?

I recently refuelled my brand new diesel engine car when it was basically empty (25 miles left) and then drove away. I drove the car for about 100 miles before noticing the standard juddering that you ...
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25 views

Help with intermittent cut out problem

Civic coupe vti 1999. Car sometimes cuts out straight after start sometimes during driving. Sometimes the car is driving without cutting out and I noticed it is harder to change gears but straight ...
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0answers
37 views

Can you tell from sound if it’s a fuel starvation problem?

Car was cutting out and mechanic told me ‘it sounds like a fuel starvation issue’. In other words he was able to get a lead from sound. Does this work and how would I be able to based on sound ...
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1answer
29 views

OBS Ford fuel quantity discrepancy

I recently purchased a 1997 Ford F-250 Heavy Duty with the 7.3L Powerstroke diesel and 212k miles on it. Two fuel tanks (front and rear) with a two-way selector on the dash. When I drove it off the ...
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11 views

GMC Envoy stalls when air conditioner is on and idling

2004 Envoy only dies when A/C is on and idling if it is in park or neutral no problem. Also will not crank after fueling once started will continue to turn over till refueling again. And service ...
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22 views

Tire width vs weight and fuel economy

215/85R16 weight=35.7lbs 245/75R16 weight=31.8lbs The diameter is the same for both. Same tire just different dimensions. My thought, the heavy but skinny one is going to be better on the highway but ...
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25 views

how to connect pressure gauge to fuel line

2009 toyota corolla 1.8L How can I find connectors to tee in a pressure gauge to my fuel line? The fuel lines are pipes so it's not possible to cut one to tee in. Below are instructions from the ...
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24 views

Took intake manifold off to replace knock sensor and takes two key turns to start engine on cold star

I replaced my knock sensors intake gasket cam shaft sensor and oil pressure sensor and now my 2005 chevy silverado 1500 Takes two key turns to start up, only sometimes, on a cold start. It was not ...
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1answer
65 views

Engine runs with carburetor's idle mixture screws closed [duplicate]

I have a Rochester Quadrajet on my boat and have been attempting to tune it. It seems that I'm getting too much fuel in with my mixture as I'm blowing black smoke. If I close the mixture screws ...
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39 views

how to Tee in a fuel pressure gauge to line on 2009 toyota corolla

Does anyone have experience teeing a fuel pressure gauge into the fuel line of a 2009 toyota corolla (specifically 1.8L) ? The 2010 model is virtually identical. The service manual says to connect it ...
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2answers
31 views

Sloshing in fuel tanks [closed]

Why is sloshing undesirable? How is sloshing prevented by installing baffles? Are there any other methods to prevent sloshing?
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1answer
53 views

Why is fuel going down quicker than expected giving miles driven?

Given the pandemic lock downs and such I've been using my car less, maybe 2 times a week and when I do drive it is for short drives, 5 miles or less usually. But it seems like each time I get in my ...
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65 views

How does this fuel tank assembly work?

I have a mini excavator (Terex HR16). I am trying to understand how the fuel tank assembly works. First some context: I was experiencing intermittent engine sputtering, sudden loss of power, and ...
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2answers
82 views

Car has been stored w/o additive, will continue storing longer - add additive now, or tool late?

I have a car ('96 Lexus ES 300) that's been parked non-operational for over eight months, except for one drive down the block last month (it started up just fine). It's in Los Angeles, so not too much ...
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32 views

Does the electric fuel pump get damaged?

The lorry was working just fine, and suddenly it stopped on its own. We did the checks including wiring, and finally, we discovered that it was a blown fuse which was no longer supplying power to the ...
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1answer
49 views

Does weekly use of vehicle decrease concerns about gas going bad?

It's recommended to use fuel stabilizer for long-term storage. The instructions for stabilizers say to run engine for a while to properly mix with fuel and protect entire system. Does regular use ...
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1answer
30 views

Why does it take more than a few gallons of gas for the fuel tank meter to update?

I noticed this recently with newer cars with electronic displays, in that for whatever reason, if you only add a gallon or two of gas, the fuel gauge won't update. However, if you fill it from a ...
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16 views

49cc stand-up scooter won't start fuel is flowing back in the tank instead of the carburetor

49cc stand up scooter wont start. When i prime it i can see the gas going backwards instead of to the carburetor. I have a new gas tank the carburetor is fairly new I take the spark plug out and it's ...
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3answers
59 views

Fuel pump problem

My daughter's car, a Honda Jazz, have not been used for more than 3 weeks. We replaced a new battery as the engine failed to start. Even with new battery, the engine still failed to crank. We took it ...
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2answers
45 views

Second butterfly valve in riding lawnmower?

So I am helping out my neighbor with her lawnmower, tuning it up and what not for the summer. I noticed that when running the lawnmower, as soon as you take it off of choke, it revs up as fast as it ...
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1answer
97 views

Bike not starting after filling it with petrol, but was completely empty before

My bike is a Honda dream neo-110cc It was completely empty before I refilled it with petrol. Now it's not starting. Someone told me that I needed to kick-start it. What was happening? What can be done?...
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58 views

What is the plastic plug for on the bottom of an SU HS4 Carburettor Piston?

Please could somebody explain the purpose of this plastic plug on the bottom of my SU HS4 carburettor piston? The lip of the plug protrudes very slightly from the bottom of the piston (shown bottom ...
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28 views

Mazda 6 MZR-CD diesel fuel issue

I have a mazda 6 mzr-cd turbo diesel wagon 2009 model. I just purchased the car and after trying to jump the car i thought the engine had no compression. However after trying again with a stronger ...
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1answer
65 views

What is the maximum calculated mpg the display will show

2015 Forester, manual transmission. I drive to maximize fuel economy, and have reached 31.5 mpg. And there it stays, for a LONG time, even though by the usual progression it should have incremented ...
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1answer
62 views

2 fuel pumps dying due to electrical issues?

I bought a 95 240sx se as a project car with a blacktop sr swapped in it. I bought it knowing it didn't run. It cranks but no fuel pump prime. So I replaced the fuel pump and it started up. After ...
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1answer
17 views

Hyundai i20 1.4 glide 2012 model

Evening guys, my car has a very serious problem, it consumes too much fuel and i have noticed that my rev counter is very high when driving, if am driving 100km\h the rev counter would be at 4100rpm, ...
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1answer
54 views

Why is there no power going to my fuel pump?

2003 Kia Spectra, here's the backstory : I recently changed the spark plugs and soon after doing so I tried to turn the car on and it only cranked. The owner before me probably try to work on the ...
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1answer
48 views

Low fuel pressure in Volvo S40 1999

My car is Volvo S40 1999 with 2.0 engine. The fuel pressure is on the idle at 2.2-2.3 bars (should be 2.5) and on higher rpm max. 2.6-2.7 bars (should be 3.0). When I unplug the hose that goes from ...
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154 views

Audi A4 Going Into Limp Mode

I have an Audi A4 B7 and as soon as I bought it off the lot, it started going into limp mode around 3k RPM. it doesn't go any higher than that even when I rev it. I have replaced the cam follower I ...
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54 views

Nylon fuel line pro/con?

('07 vanilla Cobalt LS) Car has pretty rusted fuel & vapor lines, with a 'small' leak in the fuel one. I'm considering just replacing the whole line, tank-to-engine with nylon. (eg, this, or ...
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44 views

Two Exact Cars, Two Live Data Graphs - What the hell does this mean?

Ford Ranger XLT 3.2L 4x4 2015 Diesel Automatic Live data from both vehicles, One on The left side is driving completely normal, the one on the right, has a loss of power, hesitation and black smoke ...
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175 views

Engine jerks at certain RPM - Misfire & fuel system over pressure [P000F, P0302]

My Audi A5 1.8t has started having some hiccups after an engine job (Changed valves, timing chain & camshaft intake side) The car starts fine, it sounds fine, but it has the following problems: ...
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102 views

Quick moving long term fuel trim

I have a 2004 Toyota Echo. It has been running pretty bad at idle, I don't have the CEL on. I scanned it and when warmed up the LTFT are up to 32%. When I rev it up to 2000-3000 rpm they will ...
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1answer
341 views

2016 Hyundai automatic Elantra cranks but won’t start

My wife went to leave for work this morning and her car won’t start. I go out and the engine turns over then grinds. Tried to jump it off but same problem. Any ideas?
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27 views

honda hornet 2005 cb600 high gasoline consumption

hi my hornet Consumed abut 1 liter for 10 kilo i have iridium spark plug and k&n air filter and modified exhaust i cleaned carburetor and still have this problem
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72 views

Toyota Starlet 4efe Runs Rich And Stalls

I have a 1994 Starlet, 4EFE motor with no modifications. Intermittently it will flood itself with petrol and stall, when the engine is idling. And is hard to start again. This happens at operating ...
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1answer
49 views

How come that with a worn MAF and lambda fuel economy suffers but there is no performance gained?

I'm trying to understand the advantages of lambda and MAF while I drive an old car, those parts are worn. How come I have loss in fuel efficiency while there is no gain in performance?
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1answer
89 views

Faulty O2 sensor identification

The car is a 2006 BMW 325i (N52B25 engine). The problem started out as a performance issue (car didn't pull quite that hard), after a while it turned into more serious issues like low rpm stuttering/...
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0answers
146 views

Mechanic said I put wrong fuel on my car, I know I didn't. What can I do? Who is to blame?

I have a Toyota Yaris hybrid from 2018. Last saturday my tank was half-way full, but I had to buy some things at the gas station and decided to purchase 7 or 8 litters of unleaded gasoline (10 euros). ...
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2answers
3k views

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

After filling up my 2003 Transit campervan with diesel the other day, I noticed that the fuel gauge was very slow to respond: after 10 miles it showed 3/4 full, but eventually came up to the 100% line....
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2answers
78 views

Accidentally used fuel containing methanol while my car's manual says I should avoid it. Big deal?

I recently fueled at a gas station with a sticker on the pump saying "contain methanol". Later I found out on the manual (of my Hyundai 2017 Elantra) that fuel with methanol should be avoided. I ...
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1answer
62 views

2010 Dodge Dakota Big-horn: Engine sputters when accelerating from stop

I have a 2010 Dodge Dakota, 4.8L V8, 2WD, 129K miles. The fall temperatures are starting to get a little colder, so I've noticed something that my truck does now that it didn't used to do. When I ...

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