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Fuel smell inside car , no visible fuel leak. cracked air hose to throttle body

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  • Chevrolet Master
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IF YOU DONT SEE NO FUEL LEAKS UNDER THE CAR OR AROUND THE FUEL TANK.CHECK LOOK FOR FUEL SOAK EVAP CANISTER OR VAPOR HOSE DISCONNECTED FROM EVAP CANISTER.

Posted on Mar 16, 2011

  • Jonah Oneal Mar 16, 2011

    CHECK ENGINE OIL.IF FULL OF GAS YOU HAVE LEAKING FUEL INJECTORS FLOODING ENGINE CONTAMINATING ENGINE OIL WITH GAS.

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Posted on Jan 02, 2017

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MY 2003 4.8 CHEVY TAHOE FUEL PRESSUER IS 50 PS I RUNS GOOD THEN HAS NO POWER POPS THROUE THROTTLE BODY FUEL PRESSUR DID NOT DROP WHEN I GOT BACK TOCHECK FOR TRASH INFUEL SYSTEM NONE FOUND CHANGED FUEL...


Usually popping through throttle body is a timing/misfire problem. Check for codes if possible. Inspect ignition system first. One thing comes to mind, check your air intake tube(big black hose from air filter box to throttle body) for cracks. If the truck idles fine but stumbles when you accelerate, a cracked hose will create a giant vacuum leak. Other things to check would be the TPS and MAF/MAP. A scan would be your best starting point.

Aug 16, 2014 | Cars & Trucks

Tip

P0401 Error, Insufficient EGR Flow


In my case this was caused by a bad hose from the Throttle Body to the EGR Vacuum Switching Valve. Pictures are taken from the left side of the car except for the picture of the original hose. This is with the 4 cylinder engine. I used a piece of fuel/vacuum line that I had. It fit snugly which made my cost of repair zero.
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This is the end of the original hose with the crack plainly visible.

write_tip-ozfypf1qpo1ph24coxgxyw5p-1-2.jpg
Hose run from the throttle to the VSV

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Replacement hose at throttle (far right). This is where it was cracked.

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Replacement hose (far right) on the VSV.

on Oct 30, 2015 | 1996 Toyota Camry

Tip

Air intake by engines - faults


1b) Air : leaks in air intake
Leaks in the air system can occur both before and after the throttle plate. In both cases the additional air entering is not measured by the air mass meter and causes the engine run unevenly. Engines with motor-driven idle control of the throttle plate may be able to accommodate minor air duct leaks. Hot engine restarts can be problematic if the air being drawn in is from the immediate surroundings of a very hot engine.All air ducting should be free of any leaks due to cracks or improperly fitted junctions.
Leaks after the throttle plate and into the inlet manifold severely compromise the ECU's ability to match the amount of injected fuel to the amount of 'measured' air supplied to the engine during 'closed cycle'.Although the ECU does its best to adapt and accommodate the change in air intake the engine remains rough and is less responsive to demand and often the Check engine light will become lit and codes such as P0171 (lean fuel mix) will be set. All vacuum lines should be thoroughly inspected for cracks, splits and loose fitting joints. This entails twisting the pipes to get an all-round look and feeling along the length of every less visible vacuum pipe. Many leaks can be isolated by disconnecting the vacuum lines in turn and temporarily plugging up both the attachment points and the tube ends and then monitoring the effect; a purge valve jammed open or a crack in the tubing on the EVAP system is very hard to detect other than by using this approach. Other points that may avoid easy leak detection, such as the junction between intake manifold and the cylinder head or around the injector body seals, can be tested by methodically spraying the suspect area with a fuel source (cigarette lighter fuel, alcohol, carburetor choke cleaner, propane gas, WD40 etc). A temporary surge in engine revs or perhaps stall, in response to the spray being sucked in and ignited, will confirm a suspected leak.
Engine characteristics in response to an air leak mimic the effects brought about by a faulty throttle position sensor or idle air control valve.All are related to the ECU being unable to maintain a normal ratio between the fuel dispensed and air available.
Possible leaks before the throttle plate:
  • · Air ducting connections
  • · Positive crankcase ventilation valve/crank case breather pipe/cam cover vent
  • · EVAP Fuel vapor evaporation control system that exits at the throttle body either at, or close to, the throttle plate

Possible leaks in the inlet manifold (after the throttle plate):
  • · Fuel pressure regulator valve
  • · Auto transmission in-gear hold
  • · Brake servo pipe
  • · Manifold absolute pressure sensor connection
  • · Exhaust gas recirculation valve
  • Ancillary vacuum line controlled systems
NEXT 2) Fuel systems

on Jul 15, 2011 | Mercedes-Benz E-Class Cars & Trucks

2 Answers

Idiling high, temperature guage not working. no check engine light on. no problems shifting, fan coming off & on, blowing hot & cold air. can drive it, but it wont start up right away &


Check the cable to the temp sender unit is attached if so check the unit is working with a ohms meter. check the throttle cable is not binding ,the throttle leaver stop at the throttle body housing should be fully closed .

Mar 18, 2014 | 2005 Ford Escape XLT

1 Answer

How do i clean throttle plates on 2004 gmc envoy?


Throttle body has nothing to do with the gasoline, it only regulates incoming air. In order to find the gas leak you will need to remove the air resonator assembly that goes from the air filter to the throttle body. Then you can get a look at the fuel rail and injector hook-ups.

Jan 12, 2013 | 2004 GMC Envoy

1 Answer

Have a problem with my TDI parked it on a hill yesterday saw it leaking from the washer fluid side in front. Checked the fluid smelled like diesel. Started the car and parked it on flat spot. Tried to...


You may have a leaking fuel pressure regulator.
A Fuel Pressure Regulator is a simple mechanical device that holds constant fuel pressure or relieves excess fuel pressure by way of the pressure compressing an internal spring and opening an orifice back to the fuel pump.
Normally it is mounted on top of or near the TBI (injection) throttle bodies, on top of the injector, but if it's not visible there you will need to check a shop manual of follow the fuel line visually.

If it is mounted on the motor (not under the intake cover) you can remove a rubber hose and see if there's gas in the hose. If there is, the regulator has failed. The hose is only supposed to have air in it at all times.

A bad fuel regulator can allow gas to leak onto the ground or actually leak into the motor where it fouls the plugs.

Jul 24, 2010 | 2002 Volkswagen Jetta TDI

1 Answer

DPFE changed out burning smell


Check the fuel system, the pump and the fuel pressure regulator or Mass Air Flow Sensor. Evaporated emissions are the fumes that your fuel gives off. The pollution control system pulls them back into the intake to burn them off when you are running your engine. There is a vacuum line that is leaking between the fuel tank and the sensor that detects this or your gas cap is loose or leaking. It could also be a bad sensor which detects vacuum pressures from the tank. If everything has been check, then check inside the throttle by pulling off your Air pressure Intake then open the throttle by using screwdriver or any tools than can push in one the fuel control line to open, which is attach on the left side of the throttle. and if you look straight inside, you will see three hole. Then look by the bottom and you will see the two hole cover with black burned Oil. This means your fuel mixer (Throttle) is not pushing out air properly it gets clog , and the only way to get out is when you push the Gas peddle which is the burned gas will come all the way out to the Air Intake and it will circulate to any open area. If I was right about this! Your solution is to buy a Air Intake Cleaner or Carb-Throttle Cleaner. with the engine OFF, spray inside the throttle by using the red straw and point it to clean the two black clog hole. then wait for a about10 minutes or more to dry up cleaner after spraying the inside throttle. When you start the engine, black smoke will come out to the muffler. No worry this is normal to the engine, means the cleaner is burning and working to get out. Without cleaning the throttle body, the engine will soon stall, or stop without any giving warning light, because this means your A.C. Pressure Clutch and Idle Pully barring are NO longer working properly and maybe totally wormed out. You may also change the throttle position sensor. and check all your Gas and Oil Intake Hoses for a leak. hope this will help to solve your problem. P.S. You can also spray the Intake cleaner to your Intake Mass Air Flow Pressure Filter before putting it back to the throttle body.
If you have any more question you can email me at reginestacio@yahoo.com Take care and Good luck.


Feb 14, 2010 | 2001 Mercury Sable

4 Answers

94 jimmy rough idle smells like fuel? from rear. doesn't look like leaking? The egr valve has been cleaned and i have no check engine light on. the cap, rotor, plugs and wires have been change and it...


my 94 and 95 blazer did that the fuel crab hoses are probably cracked inside the intake it will cause gas to pool up in between the upper and lower intake

Nov 20, 2009 | 1995 GMC Jimmy

1 Answer

Runs but wont idle. smells to rich. other than that it runs fine


This sound like a vacuum leak... Look carefully for loose/cracked hoses and connections from the fuel distributor/air box to the throttle body and around the idle enrichment bypass hoses... and also the intake gasket itself. The reason it smells rich is that the injectors are firing more to compensate for the lean running condition. It you run it this way too long it will overheat and warp the head or **** a valve... Hope this helps...;-)

Apr 26, 2009 | Volkswagen Rabbit Cars & Trucks

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