kevinmfaust

Ok the smell is only at boost. I have changed the pulse dampner, all new o rings on all injectors, new fuel lines, tested the purge valve and the charcoal canister is good.......I think. I checked all the lines under the car and around the gas tank. Also checked the seporator tank.....no luck. What next boys?
Kevin

Tim McCreary

If you smell it, determine where the smell is coming in. If in the vents, check where the air intake for it is and determine the closest fuel component. Double check it. It sounds like your pressure is too high causing a leak at a joint somewhere.

Tim

kevinmfaust

There is no smell in the engine compartment just after shut down. Nothing from the exhaust after shut down. When I close the vents, windows and sun roof there is no smell but if I open the sun roof or a window I get it.There was no gas smell at any of the lines or around the tank!!!!!!! I am ready to burn it. It is definitley doing the disappearing act.
Kevin

artguy

went thru that same thing twice...dont know if its the same as your prob...the first time it was the injector housing....not sealing properly.....the second time was I rebuilt the injectors again and still had the problem...found out now that I am going thru all my upgrades that the injector body was leaking....

not saying this is your prob....but just cuz you replaced the injectors..that doesnt mean that they arent leaking again....good luck


jason

kevinmfaust

I would hate to pull the injectors again.
Kevin

rx7speed811

sounds like you checked everything except for the injector housings and the fuel pressure regulator. the pressure regulator is a cheap and relatively easy to access part, maybe you should try that first before anything more expensive. hope you find your problem.

kevinmfaust

The fuel pressure reg would be a welcome fix after what I have been going through.
Kevin

edpaek

I have a question for you alll... I've always thought my car was just running rich with a bad ECU, but I'm not sure anymore... I took my car into mazda last year to do all the recalls but I have a feeling they may have skipped over the Fuel recal because a fan relay box was never installed at the ECU....

I opened the hood this morning and smelled no fuel at all under the hood... I cranked it up and immediately smelled fuel at the passenger side of the intake manifold... only area where I smelled fuel. When I went to the back to smell the exhaust, it smelled exaclty the same... Is this a fuel leak? Also I took it for a spin and drove it fairly hard... I came back and popped the hood and could not smell a drop of fuel... did it just evaporate? And when I came back to the car after letting it sit for five min, I still couldnt smell any fuel...

DaveMc

Check the fuel vapor recovery check valve - this valve fails and causes boost to bleed into the fuel vapor recovery system causing fuel smell on boost. The check valve is brushed aluminum and located near the oil filler neck. Air should only pass one-way (towards the UIM).
Dave

rx7speed811

hey davemc, do you work or kick it at murderburger in davis?

DaveMc

Yea. It's now Redrum burger - they changed their name.
Dave

rx7speed811

they changed the name? damn treehuggers...
ill drop by some time, my girlfriend goes to school up there at davis.

kevin: hope the new fuel pressure regulator is your solution.

kevinmfaust

Hey DaveMc Thanks,
I tested the one way valve the other day and it is good. Also checked the purge valve and charcoal canister with no falt found. I hope it is the reg too. Keep um coming guys.
Kevin

paw140

I think I PMed you back about this problem. I'm having the exact same problem. Fuel smell only under boost, and I only smell it when the windows or moonroof is open. I just did the vac hose job, and replaced all the o-rings, but I'm still getting a smell, but it doesn't seem as bad. I'm pretty sure I have a leaking lower intake gasket because of a non-curable high idle problem. I suspsect this is where the gas smell is coming from. I'll be replacing the gasket in the next few weeks and I'll let you know the results.

Also, let me know if you solve the problem.


Paul

kevinmfaust

Ya, DBA-Riki That is what I will do. Although I pulled out the gas tank to check out if all the valves and covers on the top of the tank where sealed and when I had the tank out I 35 pounds of pressure in the two lines that go from the pump to the engine and they held the pressure for like ten minutes. Would that be the same as a pressure gauge in the engine bay? I am leaning away from the intake because I just put the engine in with a new intake gasket about 1k miles ago so it is all new and tight. I also had the gas smell before the rebuilg. Injectors where rebuilt by RC Eng. with new o-rings for the injector housings.Thanks for your help guys.....keep um comin.
Kevin

kevinmfaust

Ok guys this is what I did today. Pulled off the upper intake manafold so I could see the injector rails, plugged the fuel return to the tank, installed a pressure gauge in the line from the tank and jumped the fuel pump at the diagnostic box so the pump would run. The gauge showed 83 psi. The entire system was under 83 pounds and nothing leaked. All the lines are ok, all the housings are ok, pulse damper no problems, fuel pressure reg ok.
WHAT UP ?
Kevin

hapa

Kevin, I remember reading on the biglist awhile ago, that underboost fuel smells could be related to a metal check valve. I'm sorry I don't have any more information. But it was stated that the valve opened under boost, and when bad would vent the gas vapor to atmosphere, hence the smell under boost only. Let me know if you find anything out.

eric

kevinmfaust

There is a one way valve that is in the fuel evaporative system. The charcoal canister is hooked up between gas tank and intake manafold. The canister catches vapor that builds up in the tank when the car is shut off. Under certain engine conditions a valve opens and exposes the canister to vacume and it emptys. There is a one way valve in that system so boost does not blow through the canister. I checked that valve and it is ok. Keep um comin guys. Thanks
Kevin

kevinmfaust

Found it. To all that where keeping track. It was a one way check valve in the vacuum line for the brake booster. The valve openes the booster to vacuum but closes it to boost. Boost was going to the booster and blowing in at the brake pedal. Now I have a turbo pissing oil.
Kevin

crai6m4ck

Wondering if this might sound familiar to you guys? I've been having a problem lately and i'm really confused. Well here it goes:
-
-When the car is cold (sitting over night) I will start it and it will pour smoke (oil) and it is bad enough that there is a big cloud.
-The smoke will eentually go away if I get in and drive the car (after approx.30 sec)
-I can shut the car off for a couple of hours and not have a problem when I restart. If it is longer than this the problem reoccurs.
-If i drive the car hard, let it sit and Idle the exhaust smells VERY RICH! It smells like i'm sitting at a gas pump.
-I only get 1/2 boost (1st and 2nd turbo)
-I get full boost occasionally only the FIRST time after I just start it.
-I hear what sounds like a boost leak when the turbos are kicking in.

Does any of this sound familiar in ANY way?

rx7speed811

craigm4ck,
i had similar problems to yours. if it is the same **** i had, you are probably getting less than half boost, probably more like 3 psi. this is a relatively hard problem to diagnose, due to the complexity of the turbo system and the multiple parts that can break to cause these symptoms.

check your main turbo control actuator from the bottom of the car, your pressure chamber and vacuum chamber for leaks, and then if you are still having problems, check the hardest one to get to, the solenoid that regulates turbo control. i believe it is the third solenoid from the front of the car on the solenoid rack. a vacuum hose change is probably going to help a lot. i just recently found out that my turbo control solenoid had a broken nipple, so i would only get boost once in a while, and it was never when i needed it. hope this helps.

jeff48

Kevin

This is the best piece of information yet!!!!
I did a complete hose job and replaced the brake booster hose without knowing about the check valve and I have been chasing the gas smell ever since. Since I always save my old hoses, it just took me three seconds to fix a demon I have been chasing for a week.

THANK YOU