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North West Datsun Enthusiasts Forum : Datsun : 510
Topic: Gas smells
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defdes
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bullet Topic: Gas smells
    Posted: 20 February 2004 at 12:32pm
I had a bad leak in the joints of my fuel filler hose in the trunk. So bad that I ended up JB Welding the connection from the hose flange to the trunk side of the filler door compartment (both sides, in the trunk and from the outside around the diameter of the filler neck to try and keep it from seeping outside the car), and the first joint going towards the gas tank where that rubber hose meets the metal one. It still smells. I taped some paper towels to the hose and took it for a spin around some left handers, and I don't see any drips, though the smell is still in the car. I have noticed some seepage out the gas cap (or that inside joint) and down the side, even after I cut a cork gasket so the gas cap is REALLY tight getting on and off. Would seapage on the outside wreek on the inside? What does anyone think? Any good remedies for this problem?
'72 LZ22 510
'71 L16 510 Vintage CS Racer
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Bre620
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bullet Posted: 20 February 2004 at 2:49pm
Is this happening every time you drive your dime...or just...lets say when it's hot out,. or warm in the car?


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defdes
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bullet Posted: 20 February 2004 at 3:17pm
Well, I'd say all of the time. The cars been down all winter, so I've missed the cool wet driving months. I live in SoCal, so all the time I've driven it, it's been fairly warm out, say....75-90 degrees.
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Yellowcar
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bullet Posted: 20 February 2004 at 5:00pm
could be that your tank is not venting correctly and building up pressure. If I remember right it should have a vented cap so getting a better seal might make the problem worse.
'72 510 LZ2.5
'06 VW Jetta
'98 mercedes C280 sport
'01 ZX9R
'02 ZX6R

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defdes
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bullet Posted: 20 February 2004 at 5:46pm
I don't have a constantly circulating system. I ditched that secondary over-flow tank (between the trunk hinges)and just have a hose venting out of the top of the gas tank and out thru a hole in the trunk which vents out in the vicinity of the rear diff. I have never noticed a collapsing of the tank as gas gets low which I thought was the primary sign of a poorly vented tank.
'72 LZ22 510
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Yellowcar
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bullet Posted: 20 February 2004 at 6:38pm

A poorly vented tank will also have a lot of either pressure or vacuum at the cap when you take it off. the car can also die after running for a bit. I had a motorcycle one that would die after about 10 miles when I had my tank bag on it (the rupper pad for the tank bag was sealing the cap)

'72 510 LZ2.5
'06 VW Jetta
'98 mercedes C280 sport
'01 ZX9R
'02 ZX6R

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defdes
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bullet Posted: 20 February 2004 at 7:38pm
Yellowcar, you have basically the same setup as me, how is yours vented? I have never experienced any performance problems, with stalling, excessive pressure, or vacum. It just stinks to the point that my girlfriend wont drive in it, you know how sensitive the ladies noses are, and she doesn't like to drive fast anyway, so maybe it's a good thing? I'm usually white knuckling enough at the wheel that the smell is the last thing on my mind.
'72 LZ22 510
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Yellowcar
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bullet Posted: 21 February 2004 at 11:06am
Don't remember and haven't been home to look yet. Just throwing out ideas for you.  Maybe you could get a new grilfriend who likes driving fast and the smell of gas
'72 510 LZ2.5
'06 VW Jetta
'98 mercedes C280 sport
'01 ZX9R
'02 ZX6R

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defdes
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bullet Posted: 21 February 2004 at 12:42pm
Don't think I haven't thought of it...but she was so tolerant through the restoration process.
'72 LZ22 510
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