well i know how if you let ur fuel get low and u take off the cap...u hear a pshhhhh when u unscrew it...but i could havea full tank a gas...run my car down the street and park it and do the same and i get a pshhhhhh as well. i hope i dont run over something on fire or im a dead man.

 

 

Check the vacuum lines from your tank. They could be clogged. Without sufficient ventilation on the tank, it will always build gas. Too much gas and you will kill your pump as well.

 

i know my car never did this before...wut could be causing this?

 

those are underneath the backseat correct?

 

Not even sure if the EF's even has vacuum lines. But i would think so. Every other car i have encountered this problem on, has vacuum lines as well as ventilation on the gascap location.

 

well it doesnt have a vented gas cap...so i would hope so

 

It is clear that the tank is building up pressure, wich also could lead to false measurements of the containment of the tank. Im sure that i remember one fat pipe and a smaller one at the side of that one. worth checking out?

 

u talkin about right where the fuel pump is? theres one line with a big bolt thru it and a small line coming out of that thing...how would i clean it if it IS clogged?

 

bump b.c now im nervous.......and wondering if thats whats causing weird mileage. mostly the second one

 

i have never picked this apart. So im just guessing here.


Here you would have the ventilation for when you are filling the tank. Makes sence.



A: Main line
B: ventilation line
C: would be the tank ventilation against gas buildup. I'd guess. You can follow the lines on the smaller picture. hope this helps.

 

ok...ill look at it tomorrow if i survive lol

 

im not even sure if my theory is right here. Tell me if you come to a solution.

 

excess gas tank pressure is susposed to be vented to the charcoal canister via the purge valve where it is later burned off in the motor. venting hydrocarbons to the atmosphere is agenst emmisions in most states. If you have built up pressure it could be becasue your purge contorl selnoid is not working of the gas tank vent that runs to the purge valve is cloged. start by trying to purge the system by connecting 12v to teh selnoid... if it clicks and relives pressure then you have a wiring problem, if it does noting the selnoid is bad, if it clicks and it dosent relive pressure you have a clogged purge line

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by onePOINTsix &raquo;</TD></TR><TR><TD CLASS="quote">excess gas tank pressure is susposed to be vented to the charcoal canister via the purge valve where it is later burned off in the motor. venting hydrocarbons to the atmosphere is agenst emmisions in most states. If you have built up pressure it could be becasue your purge contorl selnoid is not working of the gas tank vent that runs to the purge valve is cloged. start by trying to purge the system by connecting 12v to teh selnoid... if it clicks and relives pressure then you have a wiring problem, if it does noting the selnoid is bad, if it clicks and it dosent relive pressure you have a clogged purge line</TD></TR></TABLE>

Thank you, but where does the purge line go? Like, from the tank. Got pictures? Schematics? I got really curious about this matter.

 

man i thought those were normal , now im thinking if i might have the same problem. where is the solenoid? have a picture in the bay for it? mine is a dx man ... dang

 

yeah id like to know where this purge control silenoid thing or the valve is as well
heres some diagrams for a 91 civic si from honda's parts store tell me if you see it

 

Its your tank depressurizing, sir

 

yeah i know...but it shouldnt have that much pressure all the time, especially with a full tank of gas...apparently its not depressurizing enough so somehtings messed up

 

hm..... mine does it when it full too... but i never put any thought to it.

 

since you live in fairfield i might see it on the news if it does blow up ....hope you get it fixed though

 

Your tank is supposed to have pressure all the time if it doesn't then you have issues. OBD 2 cars will even trip the Check Engine light if the gas cap isn't on tight which allows the pressure not to build up. I have had this happen a couple of times with my DUB what a pain when I have to VAG Com my car cause I didn't put the gas cap back on tight enough.

 

ofcourse it needs pressure. But if it depressurizes like if theres 10% gas within the tank and 90% compressed gas when the tank is full. There's too much A couple of month ago i had to drill ekstra holes for ventilation on an Opel/Vauxhall Zafira becouse the fuel pump were not able to create enough sucktion to compensate for the pressure created on the top of the gas.

Its all about physics.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RaCk &raquo;</TD></TR><TR><TD CLASS="quote">ofcourse it needs pressure. But if it depressurizes like if theres 10% gas within the tank and 90% compressed gas when the tank is full. There's too much A couple of month ago i had to drill ekstra holes for ventilation on an Opel/Vauxhall Zafira becouse the fuel pump were not able to create enough sucktion to compensate for the pressure created on the top of the gas.

Its all about physics. </TD></TR></TABLE>

What is the correct way to measure this then? It sounds to me like this guy is using his ears to determine how much is too much. This would be similar to the people saying they got an extra 10hp out of an intake using their butt dyno.

 

im with the rbjeepthing dude.. i mean who opens their gas cap everytime they park? lol, no but seriously this doesnt make sense. he comes on here complaining about a problem then corrects everyone when they say something, secondly i drive my car everyday with a gas leak on the OUTSIDE of my tank underneath the car.. i havent blown up yet and hopefully i wont, but this doesnt sound like its a problem at all, as long as the gas cap is on right there should be maximum pressure.