(sigh) not again.....

[SaucyTabasco]

OK. So I just got my clutch problem resolved the very day before Z nationals and fortunately I was able to go. Cleaned up my car, and everything was good...or so I thought. So we get to Z nationals park, ok everything is fine until the guy that works at Z1 comes up to me and tells me I need to move my car back 2 feet because he didnt do a good job squaring me up with the rest of the line when we were parking. No problem, but when I turn I turn the car back on I hear a strange hissing noise coming from the area back behind the drivers seat near the tire/fuel door area. I cannot hear the noise to well when I have the door closed/windows up, but it is clearly heard with the windows down. I had a few people listen to it and they think that it could be the fuel pump possibly, but were not sure. When i turn the key to the on position, I can hear the fuel pump start up, but it makes a clearly electronic noise, whereas although the sound is coming from the same area, this is a loud "hiss" such as air escaping or being pulled in. Also the sound intensifies if I have it in nuetral and rev it up. I read around on twintrubo.net but could not find anyone with similar symptoms...everyone who had problems with this had a buzzing noise that generally continued either aftetr the car was started or turned off (which the buzzing after turn off has happened before, but i think this may be different, or just related somehow). Possibility of loose connection, are there any other pumps down there that create vacuum of any sort? So far it hasnt affected driving as far as I know of unless.....:

On my way home from Z1 I noticed something else strange. Whenever we would hit redlights and I have to come to a complete stop, I would have it in 1st gear of course and shortly after the clutch grabbed, about 500rpms later (maybe in the 2000rpm area) the car would 'shudder' for about a second or the duration of around 300 rpms, but would quit after that...this didnt seem to appear in different gears, either (although i think i can feel it *slightly* at the same rpm range in second). Anyone experienced something like this? It not like a violent thrash, but best described as said as a shudder, and can be felt throughout the car in the seat and especially in the shift knob. Once again, asked for advice and some buddies told me it could be something to do with the driveshaft, in particular the center support bearing (dunno if I got the name right?). Anyone have any suggestions on this either? Doubt its related to the hissing problem, as is doesn't 'feel' fuel related, but i could be wrong.

My car is falling apart on me guys I just forked over $250 for the clutch repairs, and I just finished pricing a fuel pump and thats another $300+ for OEM, but whatever happens i am DEFINATELY doing the work myself this time (the mechanic put a ding in my hood! imagine that...). I was told that aftermarket fuel pumps can be found for around $150, but Ive had no such luck in finding them yet. For shits and giggles i undertook the task of at least trying to figure out whats happening for myself, so I managed to pull the interior of the back end apart (pulled out the carpet and the center piece, as well as those two plastic mouldings, one of which houses two peculiar "tools" (?) that have black suction cups or something on them which i didnt know were there) and found those two big blaack "plugs" in the middle, one of which I am assuming is the fuel pump. However, i still couldnt hear the noise from here as well as I could lying on the ground near the drivers side back tire...so I think its gonna take 2 people on this one. AHHHH! 2 years with the car and never a problem, now the thing wants to fall apart on me!!!! I am willing to learn i just need some help!

[SaucyTabasco]

by the way, anyone have anything good or bad to say in regards to paintless dent repair (dent doctor, etc.)? Its no larger than a nickel...

[DeleriousZ]

i don't remember if you said your car was a tt or not, but HICAS maybe?

[SaucyTabasco]

unfortunately an N/A

[doberman_52]

If you want a good aftermarket fuel pump, look for a walbro 255. I hear the're gettin cheap now, but I'm not sure about the prices. It will also supply sufucient fuel flow if you upgrade your motor.


Edit: Here is one for about $105. http://www.vividracing.com/catalog/p...roducts_id/166

[k3smostwanted]

Originally Posted by SaucyTabasco

OK. So I just got my clutch problem resolved the very day before Z nationals and fortunately I was able to go. Cleaned up my car, and everything was good...or so I thought. So we get to Z nationals park, ok everything is fine until the guy that works at Z1 comes up to me and tells me I need to move my car back 2 feet because he didnt do a good job squaring me up with the rest of the line when we were parking. No problem, but when I turn I turn the car back on I hear a strange hissing noise coming from the area back behind the drivers seat near the tire/fuel door area. I cannot hear the noise to well when I have the door closed/windows up, but it is clearly heard with the windows down. I had a few people listen to it and they think that it could be the fuel pump possibly, but were not sure. When i turn the key to the on position, I can hear the fuel pump start up, but it makes a clearly electronic noise, whereas although the sound is coming from the same area, this is a loud "hiss" such as air escaping or being pulled in. Also the
sound intensifies if I have it in nuetral and rev it up. I read around on twintrubo.net but could not find anyone with similar symptoms...everyone who had problems with this had a buzzing noise that generally continued either aftetr the car was started or turned off (which the buzzing after turn off has happened before, but i think this may be different, or just related somehow). Possibility of loose connection, are there any other pumps down there that create vacuum of any sort? So far it hasnt affected driving as far as I know of unless.....:

On my way home from Z1 I noticed something else strange. Whenever we would hit redlights and I have to come to a complete stop, I would have it in 1st gear of course and shortly after the clutch grabbed, about 500rpms later (maybe in the 2000rpm area) the car would 'shudder' for about a second or the duration of around 300 rpms, but would quit after that...this didnt seem to appear in different gears, either (although i think i can feel it *slightly* at the same rpm range in second). Anyone experienced something like this? It not like a violent thrash, but best described as said as a shudder, and can be felt throughout the car in the seat and especially in the shift knob. Once again, asked for advice and some buddies told me it could be something to do with the driveshaft, in particular the center support bearing (dunno if I got the name right?). Anyone have any suggestions on this either? Doubt its related to the hissing problem, as is doesn't 'feel' fuel related, but i could be wrong.

My car is falling apart on me guys I just forked over $250 for the clutch repairs, and I just finished pricing a fuel pump and thats another $300+ for OEM, but whatever happens i am DEFINATELY doing the work myself this time (the mechanic put a ding in my hood! imagine that...). I was told that aftermarket fuel pumps can be found for around $150, but Ive had no such luck in finding them yet. For shits and giggles i undertook the task of at least trying to figure out whats happening for myself, so I managed to pull the interior of the back end apart (pulled out the carpet and the center piece, as well as those two plastic mouldings, one of which houses two peculiar "tools" (?) that have black suction cups or something on them which i didnt know were there) and found those two big blaack "plugs" in the middle, one of which I am assuming is the fuel pump. However, i still couldnt hear the noise from here as well as I could lying on the ground near the drivers side back tire...so I think its gonna take 2 people on this one. AHHHH! 2 years with the car and never a problem, now the thing wants to fall apart on me!!!! I am willing to learn i just need some help!

first is first: the black suction cup tools are headlight aiming tools supplied to you by Nissan that cam stock with the car.

next, before you go spend money on a fuel pump i would make sure that is the problem. usually when a fuel pump fails it completely fails. also, you need to hunt around and find exactly where the hissing sound is coming from. It could be that your fuel pump isn't sealed causing your fuel pressure to leak out from around the pump. if one of the hoses were loose or leaking most likely would be less air and more fuel coming out except for maybe on the return line.

if it is indeed fuel pressure leaking off, this could also be causing the shudder or hesitation you are feeling at a certain RPM.

-if the flywheel and pressure plate is not balances correctly it could cause a shudder (though i would think it would be a more than a certain RPMS)
-the center bearing in the driveshaft could cause it.
-a hesitation in the motor due to air/fuel mixture or whatever

another thing to check that could be hissing is the EGR tubes running down into your mid pipes. a leaky in the exhaust. a pin size hole in the exhaust. etc.

[SaucyTabasco]

no it couldnt be the exhaust because I JUST bought a set of borlas and had em put on, the noise is definately still there.

One thing I have noticed since I last typed this is that now when my windows are rolled down, sometimes when i come to a stop I smell a strong gasoline smell!

Although the noise may not be the fuel pump itself, it is DEFINATELY coming from the area where i think the fuel pump is...it is +/-1sq.ft. of the rear drivers side wheel....its just been difficult to locate the noise b/c i dont have a good jack/stands etc.going to buy a set today....


by the way, i have distinguished two distinct noises, one is an electronic noise and one is a sucking noise, but they are both coming from the same place. by the way, sometimes now the electronic noise, presumably the fuel pump, continues longer after i turn the car on and sometimes after i turn the car off! it sounds similar to the noise the power antennae makes when going going up or down....or something to that degree...ARG

[doberman_52]

As K3 said, check your fuel pump, make sure the seal is good. If thats not the problem I would check your fuel lines if your smelling the gas, but would say more about the fuel pump seal, you could also check your fill hoses, make sure they are tight and good still.

[k3smostwanted]

Originally Posted by SaucyTabasco

no it couldnt be the exhaust because I JUST bought a set of borlas and had em put on, the noise is definately still there.

One thing I have noticed since I last typed this is that now when my windows are rolled down, sometimes when i come to a stop I smell a strong gasoline smell!

Although the noise may not be the fuel pump itself, it is DEFINATELY coming from the area where i think the fuel pump is...it is +/-1sq.ft. of the rear drivers side wheel....its just been difficult to locate the noise b/c i dont have a good jack/stands etc.going to buy a set today....


by the way, i have distinguished two distinct noises, one is an electronic noise and one is a sucking noise, but they are both coming from the same place. by the way, sometimes now the electronic noise, presumably the fuel pump, continues longer after i turn the car on and sometimes after i turn the car off! it sounds similar to the noise the power antennae makes when going going up or down....or something to that degree...ARG

your fuel pump should make an electronic noise. it should not make a hissing noise. if you have a 2 seater, your fuel pump is right behind you. that wall behind your front seats is where your fuel tank is and thus your fuel pump is also located there.

Z32's have a common problem with smelling gas...it usually is fuel lines that need tightened in the engine bay but in your case it could be coming from the fuel lines underneath or the fuel tank.

you simply need to locate where the noise is coming from. your fuel pump could be making the noise because the pick-up line is loose therefore causing the hissing noise.

also, the fuel tank could also have a puncture hole or something causing pressure to leak out. it is not as rare as you think.

basically just look up a write-up. (twinturbo.net) and find out how to get to it to check everything out. i may even be able to remove the fuel pump without dropping the whole tank.