Question about 1993 Saturn SL1

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Failed smog because of leak in fuel line

Failed smog because of the gas would hold pressure. So were would it most likely be leaking because i putted a new fuel pump in and after that it would pass smog.

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I hazzard a guess but I would replace the gas filler cap. (the thing you take off when you put gas in the car)After all it is a pressure balanced situation.

Posted on Feb 01, 2010


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Posted on Jan 02, 2017


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3 Answers

My 98 cavalier smells of gas and leaks gas from the back of the car by back tires and gas tank get empty pretty fast

You need to get the car up on a hoist to inspect the underside and find the cause of the leak. Without a thorough inspection you cannot determine the cause. Most likely you have a fuel line that has corroded and this will leak fuel rapidly when the car is running and the fuel is being pumped under pressure.

It is not legal in many places to run your car with highly flammable fuel leaking as much as it is so you need to get it checked immediately before you get put off the road or you have a fire.

Mar 19, 2016 | Cars & Trucks

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My 1985 nissan pickup only failed the fuel EVAP portion of the smog test, how do I fix the problem?

you can fill the system with smoke under pressure to force the smoke out any leaks. you can see if a tool rental shop has a smoke tester you can rent to perform this. do not use any open flame near the system as there are fuel vapours.

Aug 04, 2015 | 1985 Nissan Pickup

1 Answer

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

Codes p0455

03 VIT
no engine option stated. hard.
0455 is classic EVAP. failure.
99.9% are loose gas cap or bad gas cap.
tighten it, reset the DTC and drive, comes back, then its real.

EVAP is the fuel tanks , venting system. its a Closed system.
the code means it has leak.
in the smog station the first test is the cap is removed
and a pressure test cap inserted on the filler neck. and
we do the classic, leak down rate test.
if it fails you fail.
not surprising, if the cap is tight and new, and you fail evap
we do that test too, first. omg it does leak.
i then hold a 1/2 rubber hose to my ear and find the leak.
we use pressure at 1-2 psi on the filler neck (shop air and reg)
to apply air, and test the system for leaks.
we use dry nitrogen, for safety but if frisky?, real air works too.

if not up to all that, you can inspect every inch of the system
and might find a cracked or hose that fell off the vents.
and friends.

Apr 13, 2014 | 2004 Suzuki Vitara

1 Answer

Gas leaking from my tank switch

Use compression barb fittings on the pressure side with fuel injection line NOT REGULAR FUEL HOSE THE REGULAR HOSE WONT HOLD UP TO THE PRESSURE. The return line can be regular fuel line because of the low pressure.

Feb 02, 2014 | 1987 Ford F 150

1 Answer

Failed smog test ; gross air leak at vapor recovery system. Replaced gas cap from parts house with a dealer supplied gas cap and the gross leak is gone but a minor air leak is...

If you just want to get through the smog test,they usually allow one monitor test to be incomplete and still pass.
If your area does,clear the codes and fill the fuel tank to the top.The other monitors should run and complete but the fuel tank monitor will not run with a full tank of gas so will not turn on the check engine light related to a tank vac leak.KEEP THE TANK FULL,and go get your smog test!

May 05, 2017 | Cars & Trucks

1 Answer

Didn't pass smog due to fuel leak? It passed the emission part of the smog test, however failed because of gas vapors leaking from the fuel system. What should I check first to locate the leak?

Fuel tankes have only one large acess on the top i sugest checkin the rubber gasket for cracks or perishing also check along the fuel lines for damp spots use your nose to locat the strongest area of gas then go from there hope this helps:)

Oct 21, 2011 | Cars & Trucks

2 Answers

1985 Ford F-150 Failed Smog - Gas tank failed pressure test.

Basically what he does is pressurizes the tank and all the lines up to the charcoal cannister.
Anywhere from the hose from the filler neck to the tank could be cracks or loose clamps.

The top of the tank has a seal for the fuel pump and rollover valves. These are rubber and could be leaking.

Under the hood you will see the charcoal cannister inbetween the radiator and engine on the passenger side. The hose could be unplugged or cracks. Or the cannister may of failed. The cannister is unseviceable
except for the valve thats on it if it has one.
You could spend a couple hours trying to find the problem especially if it on top of the tank.

What the shop will do is pressurize the tank again and with the smog machine sniffer they can stick it where you can't access to see if it can smell fumes.
Takes a shop 10 minutes to find the area if you want to know.

Feb 15, 2010 | 1985 Ford F150

3 Answers

Leak in evap system, where and what is an evap system. 2001 mitsubishi Galant

I have the same failure that occurred when smogging my Ford Ranger. The EVAP test was just added a couple of years ago and it tests for leaks in the gas tank vapor recovery system. What this is a system of vapor recovery lines that connect from the gas tank and goes to a canister then returns to the intake and on the next engine start and gets used, instead of leaking into the air.

The only issue is these lines can develop a leak at any of the connection points or along the rubber portions and can be a pain to replace depending on your application. So until you fix the leak you will fail this test since they pressurize the system and if there is a leak it won't hold the pressure.

May 05, 2009 | Mitsubishi Galant Cars & Trucks

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