S13 smells like gas and mpg is lower

[SR707DRIFT]

I'm about to buy a S13 240sx and it smells like gas and it gets a little less mpg. He says it's the Fuel Pump O-ring. Could it be something else or what? Thanks.

[Garber]

drive the car and then pull the gas cap off. if it hisses then there is pressure in the tank and the oring is good. if there is no pressure in the tank then the oring is probably bad.. its an easy fix.

[nissanfreak317]

most fuel smell stuff isn't too hard or expensive to fix. but most people will tell you anything that sounds believable to sell their car, even if they dont know what is wrong.

have a mechanic look at it, or look at the seal yourself.

[DreamN]

Could be a leaky injector. Has your "CEL" light came on?

[g35gabby]

a fresh O-ring from nissan is less than 10 bucks(least last time I got one). just replace it....... worst case is you have a fresh ring and are still in the same spot.

[s13-ghost]

Chek your injectors. Mine was my fpr luckily I had a replacemnt in hand

[tommytwo40hands]

is it actually like an unburnt gas smell or is it just an exhaust smell?

in my coupe i smell exhaust fumes all the time, but it's probably because i have no rear interior, i run 94, and i have no muffler. so all the fumes get ""trapped" under the trunk.

[Big Zee]

my bet is that is a leaking injector. my gfs old coupe had the same problem and that was the cause.

one thing to do is look for any gas leaks on your lines, injectors/rail/fpr and fuel filter.

[xtopgun32x]

all of the above. could be correct but it could just be running dumb rich too. or even just not running a cat you can smell the unburnt hydrocarbons.

[240sxftww]

lol, im 80 percent its one of your fuel line. check the lines connected to the fuel filter and get a new 300zx filter.

[icycooL]

Could be any one of these answers. I know when I was messing with my fuel pump, I couldn't find a replacement O-Ring at the time, so we had to cut it and make it fit. There was a tiny gap and sometimes if I drove it hard fuel would splash out into the trunk.

My advice would be to check out the trunk where the fuel pump is to see if there is any gas splashed out. OR if the guy is cool about it, make him show you the O-Ring. If it's just the O-Ring it's no big deal. Cheap and SUPER easy to fix. Just make sure not to fill it over 3/4 full or not to drive it hard at all until you get a new O-Ring. He probably did, and that caused gas to splash into the trunk. That explains the smell, also that would technically give you less mpg, depending of course on how hard he drove it, or maybe the gauges weren't reading properly. Even with the broken O-Ring the car will still have fuel pressure, it just takes longer for it to build. It can cause issues with the fuel gauge, making it read lower than it really is.

Hopefully it's something as simple as that, at any rate, you could probably talk the guy down on price because of it.:hsdance:

[SR707DRIFT]

Thanks everyone. I'm gonna check all these possible problems tomorrow and see how things go. And I will get back to you with the outcome.

[sidedrifts13]

check your fuel lines the ones from the tank/pump going to the hard lines, right next to the diff sorry if i dont make sense too much nyquil lol

[mau5trap]

drive the car and then pull the gas cap off. if it hisses then there is pressure in the tank and the oring is good. if there is no pressure in the tank then the oring is probably bad.. its an easy fix.

my gas tank doesn't hiss. I thought that was a good thing.

[tommytwo40hands]

I'm about to buy a S13 240sx and it smells like gas and it gets a little less mpg. He says it's the Fuel Pump O-ring. Could it be something else or what? Thanks.

can you get a picture of the engine bay, particularly the pass side, where all the emissions stuff is...i was just thinking, if it gets lower mpg and smells like fuel he might have the egr deleted...just a thought