fat_kid

iTrader: (13)

I have been smelling gas in my car for a awhile now and I'm finally fed up with it. I haven't located the defective hose yet but i want to replace the hoses beginning at the fuel filter to the hoses that connect the banks.

Does anyone have the diameter of the hoses and the length? Also, for the clips, as i should replace them too, should i get the fuel rated clips or is there something that can be wrenched tighter that would make a better seal? I would hope to be able to go the parts store then tear apart my car, as is i don't have a second car.

And I was going to replace my fuel filter, does it matter what brand I should get, is one from nissan worth it over autozone?

Thanks!

pmohr

iTrader: (26)

They're all 5/16" hoses.

As far as length, buy 3 or 4 feet of hose, and you'll be good. The reason for so much is you will cut one just barely too short, and you'll be pissed about it.

Here you go:
Crossover hose = 70mm (2 3/4")
FPR and feed to vacuum gallery (2) - 110mm (~4 3/8")
Filter to vacuum gallery - 200mm (7 7/8")

Total comes out to about 21 inches, for everything except the return line from the gallery to the pipe.

Get fuel injection hose clamps.

As for fuel filter brand, I've never seen any real difference between auto parts store and OEM products.

fat_kid

iTrader: (13)

do i have to remove the throttle body? or can a long screwdriver fit in and get the two hoses underneath it?

pmohr

iTrader: (26)

IIRC you should be able to get to them no problem, you just have to remove the intake plumbing to get there.

Can't say for sure though, I dumped the whole vacuum gallery ages ago, just have the lines running straight from back at the firewall to the fuel rail.

Max-e-MO!

iTrader: (2)

If your smelling gas, you might want to check the O-ring seal on the top of the fuel tank under the rear passenger seat (where you access the fuel pump). If that seal goes bad (I nicked mine replacing a fuel pump), you WILL smell gas inside of the car. That seal swells when exposed to gas and has to be replaced everytime you access the fuel tank. One nick, or bad seal, and your gonna smell it in the car.

Most of the time a hose will make puddles under your car while it's idling if fuel is escaping from the lines (due to the pressure). Wouldn't that be the case pmohr?

pmohr

iTrader: (26)

Yea, those things are a PITA. Get so much as a drop of fuel on them, they swell up, pop out of the groove, and are no longer usable. Can't even count how many of those I went through before I figured out a good way to get it all done without damaging it.

Usually it's very little leakage, just enough to smell it. Similar on the VGs, they're big on fuel smell when it gets cold out, just have to tighten up the clamps.

fat_kid

iTrader: (13)

I know the smell is coming from the engine bay, it just has increased in smell recently.




Ive tried re-tighten the clamps, didn't do much help. I haven't seen any leakage of any kind, and my mpg doesn't seem to be affected to a significant degree.

fat_kid

iTrader: (13)

Also, is their any benefit to upgrading the fuel filter to a 300zx one?

Max-e-MO!

iTrader: (2)

[quote=fat_kid;7062909]I know the smell is coming from the engine bay, it just has increased in smell recently.
quote]

Might want to check the injector o-rings (there is two on each injector). I had the injector on the #1, or #2 cylinder (pmohr, which one is under the intake and a pain to get to), and it would leak gas until the car got warm and sealed on the o-ring. Till the motor warmed up, I was getting a strong smell of gas under the hood. Changed the 2.00 o-rings and that fixed my problem, though it was luck that I found which cylinder it was (happen to open the hood and saw a wet spot by the injector).

As for using a 300zx FF, it will work and, make sure I'm right on this pmohr, it offers better flow and volume, though the car will only use what it needs and not pull any extra, thus it's not really any advantage other than you can claim you have a 300zx FF.

GL with your fix though.

pmohr

iTrader: (26)

Cylinder 1 would be under the UIM.

The Z32 filter is just larger, yes. That's the only difference, really.

djipka

iTrader: (9)

When I had a 5/16 hose it leaked all the time. now I have some that came with the car and I have not bothered to check what size they are, but the one that was leaking I got a 1/4 hose and 1/4 injection clamps.

as for the filter, I only use WIX/NAPA Gold for the fuel one.

pmohr

iTrader: (26)

All of the hoses are 5/16", what did you put a 1/4" on? 1/4" is far too small, unless you spent forever forcing it on there.

throttlehappy46

Sounds like the carbon canister(evap purge system) hoses may be split, which are 1/4" and allows fuel tank fumes to enter the engine bay.

Z32 filter has a larger filtration volume so it will offer more flow with the same amount of contaminates as a stock filter, so it will take longer for it to be dirty enough to reduce flow.

pmohr

iTrader: (26)

Ah, completely forgot about the EVAP system...didn't even come to mind, haven't had that in years.

BluFlame

iTrader: (2)

I had leaks with 5/16 hoses also, problem is oem size is metric and replacing it with std. size never fits perfectly, it's either too small or too big.

pmohr

iTrader: (26)

5/16" is actually about 3 thou smaller than 8mm hose (.312 vs .315), which is not even enough to worry about.

It's not a tight fit on the 8mm pipe/barbs (given that it's less than a tenth of a millimeter smaller), so there's no real point in going out of your way to find 8mm fuel injection hose.

With the proper size and proper clamps, I've never had a fuel leak

BluFlame

iTrader: (2)

i thought they used 6mm fuel hose between the fuel rails?
edit: its 8mm nvr mind

fat_kid

iTrader: (13)

I replaced the 2 hoses with the fuel filter and the one hose that connects the banks( the one not under the throttle body) and so far no more gas smell

djipka

iTrader: (9)

I put that one on between the gallery and the fuel rail. its the short hose that connects the pipes there. I fit in fairly easy. I think I might of help it with some lubricant but dont remember. Haven't had any leaks since

sparky1562

When I had this problem, it was the hose that connected the two banks. Had to go back and tighten the clamps several times as we went through cold spells. My guess is that is what was wrong. Sounds like you fixed it!