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There is no leak of gas until the engine is cold. After starts dripping on the rear of the gas tank. Yukon 4x4 05. Is this return line or something else? Any suggestions will be appreciated. Thanks

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  • Cars & Trucks Master
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You will need to follow leak to pin point the leak to fix.Could be the seal that holds the pump in tank,could be fuel filter leaking and gas is traveling down fuel line to back of vehicle.Get a pair of safety glasses to look,could be return line.Can you do a video of the leak?

Posted on Jan 17, 2013

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Posted on Jan 02, 2017

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SOURCE: Smell of gas fumes underneath vehicle near fuel tank

I also have a 2004 XC90 and a couple of months ago I had the exact same probelm... after multiple visits to my dealer's auto shop they figured out that it was the fuel pump. They replaced the fule pump and the smell disappeared. Good luck!

Posted on Nov 05, 2008

  • 1779 Answers

SOURCE: Gas line is leaking.

You want to be very careful not to make any sparks while working on this. The obvious is smoking, banging metal tools around, etc. keep cell phones AWAY from the area. Pick up some rubber fuel line from the parts store. Be prepared for some gas leakage, have a plastic pan under the leak. Disconnect the line at the tank, have a piece of new hose ready to push on over the line to as close to the tank as you can, have the end away from the tank plugged up temporarily with a pencil or something that fits snug in it, then remove the rubber hose on the filter, and connect new line from tank to filter, check for leaks, hopefully it is the rubber line you replaced, or the end of the metal line, so the new hose will hopefully cover the corroded leaking area. Clamp and Dry off area and see if you can spot any leaks.

Posted on Apr 15, 2009

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SOURCE: gas line leak. looking for a diagram of how gas lines are run

The Lines are simple if it's a 2.4 EFI the lines run on the driver side inner rail from the center top of fuel tank, and up the middle of the firewall to the injector rail or throttle body carburetor there is also one line that runs from the evap canister back to the tank and to the fuel system three lines total one is a return line the large line is the main fuel line and has the fuel filter mounted on it and is under the driver side door inside the frame rail.

Posted on Jun 29, 2009

  • 1 Answer

SOURCE: Smell of gas fumes underneath vehicle near fuel tank

this sounds like a gas pressure regulatur. a few minutes after starting,you start smelling fumes,and are getting bad gas mileage right?

Posted on Jul 16, 2009

  • 67 Answers

SOURCE: saturn code p0442, evap system small leak, can't find leak

I would send the car in for a smoke test...So much easier to find the leak...

Posted on Mar 16, 2010

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My fuel pressure goes to 60 pounds when the keys is turned on then starts dropping Is it my fuel pump or pressure regulator? 2004 GMC Yukon XL


Fuel pressure may drop due to a leaking injector or bad check valve in the fuel pump itself. The regulator does not come into effect until the engine is running and a vacuum supply is produced to it. If the regulator is leaking internally, it could send fuel back to the tank as well. Prime the fuel line and pinch off the return line ( if possible ) to eliminate a regulator problem. If the fuel pressure drops with the return line pinched off, suspect a leaking injector or fuel pump. If injector is leaking, the vehicle should run rich and cause a hard start/rough run condition

Jul 25, 2015 | 2004 GMC Yukon XL

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How do I fine a leak on Pontiac sunfire? Won't start just gas vapors like steam?


Well, you need a quick tutorial on your fuel system. Now to find a leak, stop trying to start the engine. You are only adding electrical charge to an already dangerous situation. Now stop and think this through. Modern fuel injection requires fuel under high pressure to operate. The injectors are immersed in this pressurized gas, as are the lines leading to them from the fuel tank's fuel supply line. So just by turning the key to ON, not start, you have initiated the process to start the engine, and that means the pump has operated for 2 seconds to put the fuel system under high pressure.

Now if you follow the fuel supply line (from the gas tank) to the engine connection, start here to find a leak. It is now under high pressure from here to the injectors on the engine- one for each cylinder-it should be dripping with gas somewhere. You could even turn the key to off after the pump has ran for 2 seconds. The fuel system is designed to hold pressure in the system for about 10 to 15 minutes, before slowly bleeding off. Enough time to search for a gas leak. A couple of other things associated with the system: there will be also a fuel return line from the injector rail, it goes back into the gas tank. both the supply line and the return line often run alongside each other. There is also a fuel pressure regulator, immersed in the fuel rail, a seal on that may have started leaking. If an air breather housing, or some cover prevents your seeing the fuel system entirely, then set it aside. You should be able to find the leak. Just be careful, have lots of rags handy, happy hands are learning hands.

Dec 28, 2014 | 2000 Pontiac Sunfire

1 Answer

Smell gas not everyday no puddles no dripping


might be the RETURN line back to tank, most overlooked fuel line in the world, sends unburnt fuel & FUMES back to tank & or engine, recycled fuel. these lines rust, rot, subject to salt corrosion, etc., OR, vapor leaks from the evaporativeemissions control system (charcoal canister filter clogged) check condition of all hoses (vacuum) and fuel ...... or your main fuel line is leaking you just can't see it without a complete, thorough inspection !!!!! is fuel fliter leaking @ filter? connections ......

Mar 15, 2013 | 1997 Chevrolet Tahoe

1 Answer

92 Jeep cherokee Laredo....u can smell gas while it's running and just after it's parked also after driving i can hear dripping coming from around the gas tank but haven't seen any dripping or...


The first and most important thing is to stop driving the vehicle IMMEDIATELY!

All modern cars and light trucks with gasoline engines use a relatively high pressure fuel system, with the entire system pressurized from the tank up to the engine, as well as a return flow circuit. Depending upon the nature of the leak, you have a serious potential for a disastrous fire to occur here, because the leak, if on the delivery side of the system, can spray the fuel out in a fine mist that will travel quite a distance and is very easily ignited. Return side leaks, while at a somewhat reduced pressure, are still to be considered a serious fire risk.

Older vehicles with engine-mounted pumps maintained the pump inlet line (the line from the tank) at a slight negative pressure while in operation, so leaks there were less serious while also being more likely to kill the engine.

Now ... as to the leak itself... All that you can do is to get under the vehicle and LOOK! There will visible evidence of the leak. It is possible that the leak is the tank itself, a line connection to the tank, the tank unit seal, or even the tank filler neck. However, if the leak occurs during operation and for a short time afterwards, but then stops, I'd bet on a delivery or return line problem.

Once the location of the leak has been pinpointed, the proper fix can be determined...

Oct 04, 2012 | Cars & Trucks

1 Answer

2000 alero smells like gasoline in the cab at start up


LOOK FOR FUEL LEAK UNDER THE HOOD IN THE ENGINE COMPARTMENT.CHECK FUEL LINES.TO FUEL RAILS.AND CHECK FOR FUEL LEAKS AT FUEL PRESSURE REGULATOR.LOOK UNDER CAR FROM FRONT TO REAR TO FUEL FILTER TO FUEL TANK LOOK FOR FUEL DRIPPING.IF YOU FIND NO LEAKS.YOUR EVAP CANISTER NEXT TO FUEL TANK FULL OF GAS OR EVAP CANISTER HOSES DISCONNECTED OR BROKEN.DONT DRIVE VECHICLE UNTIL YOU FIND FUEL LEAK.NOT SAFE.

Feb 04, 2011 | 1999 Oldsmobile Alero

1 Answer

2002 yukon hard to start, where is the fuel filter and how to replace it.


FIRST RELIEF FUEL PRESSURE BY REMOVING GAS CAP REMOVE FUEL PUMP RELAY START ENGINE UNTIL IT DIES LACK OF FUEL. FUEL FILTER IS MOUNTED TO THE RIGHT FRAME RAIL.NEAR THE FUEL TANK.YOU NEED A FLARE NUT WRENCH TO LOOSEN FUEL LINE AT FILTER AND A ADJUSTABLE WRENCH HOLD FILTER LARGE NUT WHILE LOOSEN FUEL LINE THIS KEEP FROM TWISTING FUEL LINES WHILE LOOSEN FUEL LINE.BESURE TO GO TO DEALERSHIP AND BUY NEW O - RINGS AT FUEL FILTER LINES.LUBRICATE NEW O- RINGS WITH CLEAN ENGINE OIL.WHEN INSTALLING NEW FUEL FILTER DONT OVER TIGHTEN FUEL LINES CUTTINGTHE O -RINGS AT FUEL FILTER.IF SO THEY WILL LEAK GAS WHEN YOU START UP ENGINE.WHEN DONE CHECK FOR GAS LEAKS WHEN DONE DONT DRIVE UNTIL YOU CHECK FOR LEAKS FIRST.

Aug 16, 2010 | 2002 GMC Yukon XL

1 Answer

Well its this line that come from my gas tank


There is a leak in the line itself. This happens over time from road grime. You can repair this yourself quite easily once you pinpoint exactly where the leak starts. Hope this helps.

Sep 19, 2009 | 1998 GMC Yukon

1 Answer

Gas smell when starting and small dripage when back up from under engine


It sounds like the return fuel line is leaking. There are two fuel line and one is the high pressure line which goes to the fuel pressure regulator then to the fuel rails. There is then a return line from the fuel rail to the gas tank.
With the amount of fuel leak, it's going to be the return line since it's not that bad compared to the high pressure side. Follow the fuel lines from the drivers side around the steering shaft to the engine. The high side and low side (return) run side by side and you should see it leaking when the engine is running.
Good luck and hope this helps.

May 25, 2009 | 1994 Chevrolet Beretta

1 Answer

F150 dual fuel tank problem


I have to say i'm only guessing, but it sounds like the valve that switches the flow of gas from one tank to the other must be sticking part way open, or bypassing or something, and anything your engine doesn't require, is being returned to the front tank, instead of the rear.

Apr 25, 2009 | 1987 Ford F 150

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