I have a gas leak. Where is it?

Asked by Sep 06, 2012 at 04:34 AM about the 1995 Nissan 300ZX 2 Dr STD Convertible

Question type: Maintenance & Repair

I took the car to an old fashioned mechanic to inspect the underside of the area where the fuel tank/engine were
located.  We found evidence of leakage coming from above under the gas tank.  I paid him 50 dollars.  Then I
inspected the area around the fuel pump and level sensor and it was dry with no indication of leakage.  There is no  
evidence of a leak from around the engine from above.  The smell of gas is much stronger with a full tank.  It nearly
disappears when the tank is below 1/4.  WTF!!!

6 Answers

223,105

So it does sound like it is leaking at the top of the gas tank, as eveidence of it only smells when the tank is full. You might have to drop the fuel tank to see if there is a crack or a gasket is bad. Also check the area where the filler neck connects into the tank.

1 out of 1 people think this is helpful.

I forgot to mention; when I unscrew the fuel cap, there is a definite vacuum in the tank even after sitting for a day. Also, when the tank is full, the smell is pervasive while parked.

the vacuum is ok the fuel system runs on a pressurized system i had asked the same question on 300zxclub.com

So where is the leak? I now suspect some kind of vent with either a defective check valve or a disconnected hose. There seems to be no access to the filler vent without removing the tank which would cost more than the blue book value of the car. The car looks well worn, but it drives like it was new. Using only Castrol Syntec for the life of the car, it uses no oil and runs like a champ. I hate to have to dump it for a probable simple fix, but the gas fumes have become intolerable and perhaps dangerous.

95

never heard of anything like that. i had a 90 and i know its hell to get a tank out of that car. best of luck

185

tighten all the fuel line clamps under the hood they work lose in cold weather for some reason but do it now the car can catch fire

Your Answer

Add photo

Related Questions

300ZX

Looking for a Used 300ZX in your area?

CarGurus has 156 nationwide 300ZX listings and the tools to find you a great deal.

ZIP:

Search Nissan 300ZX Questions

Nissan 300ZX Experts

#1 Tom Demyan
Tom Demyan
Reputation 440
#2 Jamie Staples
Jamie Staples
Reputation 280
#3 dandyoun
dandyoun
Reputation 230
View All

Related Models For Sale

Used Nissan 240SX
13 listings
Used Ford Mustang
363 Great Deals out of 44,352 listings starting at $1,000
Used Chevrolet Corvette
180 Great Deals out of 20,801 listings starting at $3,995
Used Toyota Supra
48 listings
Used Chevrolet Camaro
283 Great Deals out of 38,314 listings starting at $1,250
Used Nissan 200SX
15 listings
Used Mitsubishi Lancer Evolution
24 Great Deals out of 631 listings starting at $15,250
Used BMW M3
56 Great Deals out of 1,919 listings starting at $2,250
Used Mitsubishi 3000GT
89 listings starting at $2,995
Used Mazda RX-7
54 listings