Question about 1995 Nissan 300ZX

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1995 Nissan 300 ZX

My Nissan builds up pressure in the gas tank and spews out gas. The gas cap fits tightly

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Check and see if you have a vented gas cap.the vent may not be working,maybe blocked.you may also need to check your vapor canister in the engine compartment.

Posted on Apr 18, 2009

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You have some otyher issue here besides the pressure problem.

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I have an 85 Toyota pick up efi and I put a new fuel pump in and I cant put the gas cap on tight or it builds pressure and with it off it leaks gas out the overflow in the engine compartment?


Either the Gas Cap is shot or the tank vent is clogged. First thing i would recommend would be to try swapping the gas cap for one from another car (without the same problem).
The Gas Cap should be a vented style cap, but if it quits it can build up pressure inside the tank. If swapping the cap doesn't stop the pressure, than the vent is clogged, it's on top of the tank

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If you mean the fuel line,start the engine, then remove the fuel pump relay , when not enough fuel pressure to run the engine, it will die and line will be depressurized. The tank itself only has minimal pressure which is vented. Removing the filler (gas) cap will relieve any excess pressure in the tank...Mike

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03 cavalier shows p0440 code startrs stumbs and dies


P0440 code translates to Evaporative Emmission System (EVAP). I suspect that your gas cap is not fitting tight enough on your tank to build up enough pressure to keep the EVAP sensor from detecting a fault. You may have to replace your gas cap or check to see if it was tight. It may take a few trips with the fault fixed to extinguish the light and more to get rid of the P0440 code in your computer. Removing the cable on your battery, the negative one for about two or three minutes may be enough to make your computer forget.

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I am not sure I understan tghe question. You should not have a lot of pressure in the tank. There are hoses that capture any vapors that are in the tank and eleviate pressure build up.
Most often I have found the engine light on because of gas tank vent, such as loose
or bad gas cap or the vent valve stuck open. The computer does a cycle ever so often
and maintains the vent pressure build up in the gas tank and vapor canister, and if the purge valve sticks open the computer gives a check engine light and code as the pressure is not in the vapor storage tank when called for.
If your worried about no pressure at all then I would change the gas cap and see if this helps

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your building up back perssure in the tank your perssure release vale for your tank has gone bad

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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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