Question about 2001 Cadillac Catera

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Gas is being forced out of the fuel tank when the vehicle is running.

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A defective fuel pressure regulator (located on the fuel rail) may have blown the gasket on the
fuel pump (located in the gas tank).
Another thing to check - the car's computer may have posted
an error code from the fuel tank pressure sensor.. I'm not sure, but if this sensor shows pressure
building in the fuel tank, rather than let it explode its seals, the sensor may intentionally leak fuel
in order to relieve the internal fuel pressure build-up inside the fuel tank.

On the fuel rail (supplies fuel to the fuel injectors on top of the engine), there will be a Schrader valve,
which is your connection to connect your Fuel Pressure Gauge to your car's fuel rail.
Give it a check, but put a shop rag around the connector as your screw it in - fuel (and fuel
pressure) will leak as you install the fuel gauge.

You may get computer diagnostic codes P0158 or P0159 - see below for interpretation.
Note that the PCM is the Powertrain Control Module, which is the car's computer.
Also "TP sensor" is the throttle position sensor.
Trouble Code: P0158

Meaning: HO2S-22 (Bank 2 Sensor 2) Circuit High Input

Possible Causes:

Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)

HO2S element is silicon, water or fuel contaminated

HO2S signal circuit is shorted to system power (B+)

HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits

PCM has failed

Trouble Code: P0159

Meaning: HO2S-22 (Bank 2 Sensor 2) Slow Response

Possible Causes:

Exhaust leak present in the exhaust manifold or exhaust pipes

Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)

HO2S element is silicon, water or fuel contaminated

TP sensor element broken (can cause false acceleration event)

Posted on Mar 18, 2011

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I had a similar problem and found it by accident when I was pulling the tank apart, the pump is mounted to the bottom the the gas tank and has a molded rubber fuel line between the pump and sending unit and it was split causing pressure build up in the tank and only 15psi at the fuel rail. If I remember right there was a electronically controlled vent that would relieve pressure and possibly fuel if the tank was full enough

Posted on Nov 29, 2011


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This is going to sound strange but sometimes when a vehicle sits the gas drains back into the tank. This happens when there is an air leak in fuel system (lines, fuel filter, fittings in the system, etc). Place a short length of hose into the gas tank filler opening. Prepare to blow into the hose while sealing the opening around the hose and the filler neck. You can seal it with tape or just by holding a plastic bag tightly over the opening and around the hose. Blow in slowly and steadly. You want to pressurize the system and then hold the pressure to force the gas thru the fuel lines, fuel filter, etc. You want to inhale thru your nose and exhale into the hose just enough to pressurize the system. You can then exhale thru your nose as long as you hold the pressure in the hose (stick your tongue over the hose end to seal it). Don't breathe in from your mouth or you will be hating things. When releasing pressure from the hose do so gently or the gas will slosh back on you. You can have someone crank the engine while you are pressurizing the fuel system. You are just trying to move the fule that much closer to the carbs so you can get her running. Another option is to pour some gas down the car and try starting the vehicle. It will run for a short time and allow the fuel pump to pressurize the system. .

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Gas spewed out my gas tank in my 1991 civic hatchback while running. drove about 100 miles in 80 degree weather and parked idling for about 5 min when i looked over and gas was spewing out tank while gas...

Sounds like your gas cap may not be on right or is faulty ...and is now heat is forcing the fuel out of your gas tank. If removing and reinstalling the gas cap or even replacing it doesnt work, this is just an idea as to what the problem is. This is a very hazardous driving situation. I would NOT let anyone drive this car at the moment. Call a repair shop that has the ability to tow the vehicle. and expect a price tag somehwere in the range of 600-800 dollars to replace a fuel pump plus towing. Leaking fuel at that rate is not to be taken lightly. In anycase,it could be a fault in the fuel vapor canister, fuel lines clogged or damaged or even a faulty gas cap. I just want you to be safe at all costs...and if towing it ensures it...then do it.

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