fuel leak - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sidewayzsilvia · 06-13-2011, 09:55 PM

Got home work today and noticed that fuel is leaking from the bottom of the vapor canister, is this thing junk? Looks like return line back to the tank runs through the canister? Any answers or ideas

AutechKouki · 06-13-2011, 10:13 PM

You top off your gas tank when you refill? Thats the only reason I can think of that your charcoal canister would be full and spilling it out.
And it's not a return line, it's basically like a breather for your gas tank, it can be deleted with a plug and a clamp on top of the gas tank.

sidewayzsilvia · 06-13-2011, 10:33 PM

I pulled the 3 hose coming off of the canister, 1 vacuum, 1 line back to tank, on bigger
Hose there was gas coming out of that line. It had some pressure behind it but not a lot.

AutechKouki · 06-13-2011, 10:43 PM

Yeah, it was pressure from your tank.
Oh and if you're going to delete it plug up your vacuums.

sidewayzsilvia · 06-13-2011, 11:04 PM

Removed gas cap and sure enough the tank was under pressure, think I need a new fuel cap?

AutechKouki · 06-13-2011, 11:06 PM

Haha. No that's a good sign. It should be under pressure.

sidewayzsilvia · 06-13-2011, 11:13 PM

Never had a problem before when filling my gas tank, until now. I placed a bottle to collect the fuel come from the line off of canister and as soon as I pulled fuel cap off and relieved pressure the fuel from line stopped. Where is the tank vented, maybe the vent is stuck closed

AutechKouki · 06-13-2011, 11:20 PM

It vents fumes through canister.
Personally I think your tank is just overfilled. Don't top off when you fill up, just until the pump clicks off. Topping off causes the charcoal canister to saturate and leak out.

sidewayzsilvia · 07-08-2011, 04:22 PM

Update:
Still haveing the same problem, haven't topped off tank since. Even at 3/4 of tank and its above 80 degrees I get raw fuel pushed through vent line and out of charcoal canister.

sidewayzsilvia · 07-08-2011, 04:33 PM

Update:
Still haveing the same problem, haven't topped off tank since. Even at 3/4 of tank and its above 80 degrees I get raw fuel pushed through vent line and out of charcoal canister.

sidewayzsilvia · 07-09-2011, 11:04 AM

Is there some sort of check valve or something to stop fuel from being pushed that far into the system?

sidewayzsilvia · 08-03-2011, 05:17 PM

Update
Redplaced the fuel check valve in vent line. Still have same problem, anyone have any other ideas????

KiLLeR2001 · 08-04-2011, 03:18 PM

What about the possibility of your fuel gauge or sending unit not sending a correct signal causing you to fill too much?

sidewayzsilvia · 08-04-2011, 04:25 PM

Never thought of that I guess, when I do fill it I stop after the pump clicks off the first time. What cause cause fuel pump to shut off

uhhh-s13 again · 09-03-2011, 07:45 PM

you ever solve the problem. my car started doing the same thing today. i dont have the canister and i have a sr, so my gas tank breather is just ends and is open by the starter and the rest of the fuel lines. never did this till today.

sidewayzsilvia · 09-03-2011, 09:24 PM

No I haven't figured it out yet. I just don't fill my tank over 3/4 of a tank.

uhhh-s13 again · 09-16-2011, 12:33 AM

That sucks. I think its something to do with the vac system and blowby. Mine started doing it the day I put my new pcv valve in.

MyNameIs-dRu · 10-02-2011, 01:15 PM

Hi guys,

Thread jack but I hope to get some help here.

I'm having a massive leak and it seems like it's coming from behind the block and firewall but I can visually see it. I see it leak around that area and tried from underneath and above the block to pin point it but it's so hard.

Anyone got a clue or had this issue. Is my gasket blown?

-Noob Owner of a 93' 240sx

AutechKouki · 10-02-2011, 01:19 PM

Fuel right?
It's going to be most likely the fuel pressure regulator seal, or return line. Maybe even your fuel hard lines.

MyNameIs-dRu · 10-02-2011, 01:23 PM

Yeah Fuel.
Thank's for the input SDV. I'll have to dig in some more under the Texas Heat

AutechKouki · 10-02-2011, 01:26 PM

An easy way to create fuel pressure is to put your key in the on position by cycling the key on and off. That way you don't have to turn on your engine.

uhhh-s13 again · 10-11-2011, 02:57 AM

Took my mbc off. No more blow by and no more fuel leak. The weather is alot colder out now though.

06-13-2011, 09:55 PM	#1
sidewayzsilvia Leaky Injector Join Date: May 2011 Location: MN Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	fuel leak Got home work today and noticed that fuel is leaking from the bottom of the vapor canister, is this thing junk? Looks like return line back to the tank runs through the canister? Any answers or ideas

08-04-2011, 03:18 PM	#13
KiLLeR2001 Post Whore! Join Date: Jun 2007 Location: オーランドフロリダ Posts: 7,955 Trader Rating: (46) Feedback Score: 46 reviews	What about the possibility of your fuel gauge or sending unit not sending a correct signal causing you to fill too much? __________________

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06-13-2011, 10:13 PM	#2
AutechKouki Zilvia Addict Join Date: Jan 2011 Location: SoCal Age: 29 Posts: 669 Trader Rating: (43) Feedback Score: 43 reviews	You top off your gas tank when you refill? Thats the only reason I can think of that your charcoal canister would be full and spilling it out. And it's not a return line, it's basically like a breather for your gas tank, it can be deleted with a plug and a clamp on top of the gas tank.

06-13-2011, 10:33 PM	#3
sidewayzsilvia Leaky Injector Join Date: May 2011 Location: MN Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	I pulled the 3 hose coming off of the canister, 1 vacuum, 1 line back to tank, on bigger Hose there was gas coming out of that line. It had some pressure behind it but not a lot.

06-13-2011, 10:43 PM	#4
AutechKouki Zilvia Addict Join Date: Jan 2011 Location: SoCal Age: 29 Posts: 669 Trader Rating: (43) Feedback Score: 43 reviews	Yeah, it was pressure from your tank. Oh and if you're going to delete it plug up your vacuums.

06-13-2011, 11:04 PM	#5
sidewayzsilvia Leaky Injector Join Date: May 2011 Location: MN Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	Removed gas cap and sure enough the tank was under pressure, think I need a new fuel cap?

06-13-2011, 11:06 PM	#6
AutechKouki Zilvia Addict Join Date: Jan 2011 Location: SoCal Age: 29 Posts: 669 Trader Rating: (43) Feedback Score: 43 reviews	Haha. No that's a good sign. It should be under pressure.

06-13-2011, 11:13 PM	#7
sidewayzsilvia Leaky Injector Join Date: May 2011 Location: MN Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	Never had a problem before when filling my gas tank, until now. I placed a bottle to collect the fuel come from the line off of canister and as soon as I pulled fuel cap off and relieved pressure the fuel from line stopped. Where is the tank vented, maybe the vent is stuck closed

06-13-2011, 11:20 PM	#8
AutechKouki Zilvia Addict Join Date: Jan 2011 Location: SoCal Age: 29 Posts: 669 Trader Rating: (43) Feedback Score: 43 reviews	It vents fumes through canister. Personally I think your tank is just overfilled. Don't top off when you fill up, just until the pump clicks off. Topping off causes the charcoal canister to saturate and leak out.

07-08-2011, 04:22 PM	#9
sidewayzsilvia Leaky Injector Join Date: May 2011 Location: MN Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	Update: Still haveing the same problem, haven't topped off tank since. Even at 3/4 of tank and its above 80 degrees I get raw fuel pushed through vent line and out of charcoal canister.

07-08-2011, 04:33 PM	#10
sidewayzsilvia Leaky Injector Join Date: May 2011 Location: MN Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	Update: Still haveing the same problem, haven't topped off tank since. Even at 3/4 of tank and its above 80 degrees I get raw fuel pushed through vent line and out of charcoal canister.

07-09-2011, 11:04 AM	#11
sidewayzsilvia Leaky Injector Join Date: May 2011 Location: MN Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	Is there some sort of check valve or something to stop fuel from being pushed that far into the system?

08-03-2011, 05:17 PM	#12
sidewayzsilvia Leaky Injector Join Date: May 2011 Location: MN Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	Update Redplaced the fuel check valve in vent line. Still have same problem, anyone have any other ideas????

08-04-2011, 04:25 PM	#14
sidewayzsilvia Leaky Injector Join Date: May 2011 Location: MN Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	Never thought of that I guess, when I do fill it I stop after the pump clicks off the first time. What cause cause fuel pump to shut off

09-03-2011, 07:45 PM	#15
uhhh-s13 again Join Date: Jul 2011 Location: redmond, or Age: 34 Posts: 17 Trader Rating: (0) Feedback Score: 0 reviews	you ever solve the problem. my car started doing the same thing today. i dont have the canister and i have a sr, so my gas tank breather is just ends and is open by the starter and the rest of the fuel lines. never did this till today.

09-03-2011, 09:24 PM	#16
sidewayzsilvia Leaky Injector Join Date: May 2011 Location: MN Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	No I haven't figured it out yet. I just don't fill my tank over 3/4 of a tank.

09-16-2011, 12:33 AM	#17
uhhh-s13 again Join Date: Jul 2011 Location: redmond, or Age: 34 Posts: 17 Trader Rating: (0) Feedback Score: 0 reviews	That sucks. I think its something to do with the vac system and blowby. Mine started doing it the day I put my new pcv valve in.

10-02-2011, 01:15 PM	#18
MyNameIs-dRu Join Date: Sep 2011 Location: Central Austin Texas Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	Hi guys, Thread jack but I hope to get some help here. I'm having a massive leak and it seems like it's coming from behind the block and firewall but I can visually see it. I see it leak around that area and tried from underneath and above the block to pin point it but it's so hard. Anyone got a clue or had this issue. Is my gasket blown? -Noob Owner of a 93' 240sx

10-02-2011, 01:19 PM	#19
AutechKouki Zilvia Addict Join Date: Jan 2011 Location: SoCal Age: 29 Posts: 669 Trader Rating: (43) Feedback Score: 43 reviews	Fuel right? It's going to be most likely the fuel pressure regulator seal, or return line. Maybe even your fuel hard lines.

10-02-2011, 01:23 PM	#20
MyNameIs-dRu Join Date: Sep 2011 Location: Central Austin Texas Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	Yeah Fuel. Thank's for the input SDV. I'll have to dig in some more under the Texas Heat

10-02-2011, 01:26 PM	#21
AutechKouki Zilvia Addict Join Date: Jan 2011 Location: SoCal Age: 29 Posts: 669 Trader Rating: (43) Feedback Score: 43 reviews	An easy way to create fuel pressure is to put your key in the on position by cycling the key on and off. That way you don't have to turn on your engine.

10-11-2011, 02:57 AM	#22
uhhh-s13 again Join Date: Jul 2011 Location: redmond, or Age: 34 Posts: 17 Trader Rating: (0) Feedback Score: 0 reviews	Took my mbc off. No more blow by and no more fuel leak. The weather is alot colder out now though.