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Old 10-15-2001, 04:09 AM   #1
Andrew
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Default Attn: To EVERYONE who has run high idle fuel pressure

It seems (or am I just noticing this now?) that there is a good amount of people running high idle fuel pressure.....

If you are running high idle pressure PLEASE check your oil. What I mean by this is take out your dipstick and feel the oil and smell it to see if there is any gas in it. This has happened to me and skywalker @50psi and im sure some others out there and might even happen at lower fuel pressure.

IF you do smell gas, drain your oil and put some fresh stuff in there. Your engine could seize because of the gas in there and that would definitely not be good. Please becareful and please make sure you have a good idle fuel pressure.

Also read the Dabbler's post about returning to stock idle pressure with an SVX FPR.
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Old 10-15-2001, 05:15 AM   #2
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well runnign 50 PSI @ idle is crazy in the first place but secondly if you have a functioning PCV system that vapor will be introduced into the combustion process, but you should never run more than 36 PSI @ idle, unless you want that kinda pressure for god only knows what reason.

Jeremy
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Old 10-17-2001, 01:43 AM   #3
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Excessive oil in the crank case is caused by bad rings, and/or to high combustion pressures.
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Old 10-17-2001, 02:37 AM   #4
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Just FYI, my pics of the swap are over here -- http://mwic.org/8complex/svx-fpr-swap/

BTW, HndaTch... aren't you out of state? lol
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Old 10-17-2001, 03:05 AM   #5
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HndaTch627,

Just to let you know we sort of don't have a choice in the matter. It is either 50+ PSI or 25PSI and the car dies and sounds awful. Of course this is really bad for the engine too. I am trying to fix a leak in my SFMU but still having small issues.

Then I will be running about 31 PSI...

All we are saying is check your car every so often.
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Old 10-17-2001, 03:27 AM   #6
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i simply cant find a damn SVX FPR. i think ill just find out how much a SARD unit costs or try out the WRX FPR.
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Old 10-17-2001, 05:23 AM   #7
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Try searching on www.mypartshop.com or www.car-part.com for that regulator. Most likely you'll want to look for fuel systems or something along those lines.

FYI, my car with the Walbro pump and SVX regulator pushes 31-32psi at idle. Bill, you getting 25 psi with an SVX FPR?
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Old 10-17-2001, 05:27 AM   #8
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I have been doing some thinking and can;t find a logical explanation why running rich will cause a fuel smell in your oil unless you already have a problem with a bad set of rings.

Eric
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Old 10-17-2001, 11:09 PM   #9
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I've been running at 52~56PSI at Idle for quite some time, so today I went and smelled my dipstick Smelled like oil to me
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Old 10-18-2001, 12:12 AM   #10
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Quote:
Originally posted by Imprezinator
I have been doing some thinking and can;t find a logical explanation why running rich will cause a fuel smell in your oil unless you already have a problem with a bad set of rings.

Eric
you know that could be EXACTLY my problem. do a search under my name and you will find a couple posts about me burning up oil under hard runs, as in, when i would step on the gas huge amounts of smoke would come out of the tailpipe. i would love to hear the shop tell me that is why it was happening. then i could just have them fix them, put up a new oil pan, tap it, and be done to fix my leaking problem and everything.
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Old 10-18-2001, 01:24 AM   #11
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Sounds like a bad set of rings to me.
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Old 10-18-2001, 01:32 AM   #12
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92 SVX fuel pressure regulator, $130 at the following link...

http://www.carparts.com/parts/sample...rtnum=NONE&dc=

Chad
93 1.8T
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Old 10-18-2001, 02:50 AM   #13
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chad thats way more than i want to pay for an SVX FPR. i want the price of what otehrs are getting for used ones. ive seen 30-50 bucks.







could bad rings cause any other problems if the car is run with them for awhile?
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Old 10-18-2001, 02:56 AM   #14
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Maybe I do have bad rings. I really don't know, but I doubt it. I have never had my oil smell like fuel before I put the Turbo in. Once I put the Turbo on and did the Fuel Line Conversion my oil has slowly started to smell like fuel.

When you are running way to much fuel at idle for a long time, driving in lots of traffic you, sitting at idle a lot in traffic, the fuel is bound to get past the rings with to much fuel. Besides that I do not have a problem with smoke coming out my tailpipe ever. knock on wood...

As for an SVX FPR, I do not have one. I have a SFMU and that si what was giving me 25 PSI at idle. Found some new screws for it with new seals so hopefully that might solve my fuel pressure problem. Then I can change my oil.
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Old 10-18-2001, 06:26 AM   #15
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If you're running REALLY rich at VERY high compression levels (ie: stock compression and full boost) you [i]may[i] be losing a bit through the rings and into the bottom end, but it's kinda iffy. Only other thing I can think of is maybe a head gasket that is very slightly leaky, leaking a bit of the compression chamber mixture through to an oil channel.

Try compression testing the motor, and probably leak-down as well. One of the two will tell you if anything is wrong in there.
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Old 10-18-2001, 12:43 PM   #16
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if youconsistanly have enough fuel getting into the oil to smell like gas, i dout that your car would idle. If you have enough fuel to do this, you would be flooding your engine at idle or every time you start. los o black smoke
I have the side feed style injectors, and replaced them with bigger ones. In the process of putting them back in, i lost a bunch of fuel into the intake. When i went to start the engine (which was completely flooded)i am sure that some might have got pushed past the rings and into the oil. that is why i changed my oil after i did that.
i am running 55psi at idle, and have no leaks now.
Maybe you put the rubber seals in the wrong way and that is why it is leaking?
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Old 10-18-2001, 01:24 PM   #17
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My car is not a subaru but i have the same problem as well...every since going turbo ive had a fuel smell from the oil. Suggestion were to replace the o-ring on the injector or have them cleaned cause they maybe leaking. Ive talked to others that have the SR20det and they have similar problems with the smell so i just ignored it and change my oil every 1000mi.
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Old 10-18-2001, 02:59 PM   #18
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Quote:
Originally posted by Andrew
chad thats way more than i want to pay for an SVX FPR. i want the price of what otehrs are getting for used ones. ive seen 30-50 bucks.
Someone else suggested an EJ22T FPR, which may be easier to find. However, I have not had any other confirmation that this will hold as well as the SVX's. If it does work, an added bonus would be that reportedly it has the same 0 vac pressure as an RS, namely 43psi nominal, instead of the SVX's 36psi nominal. As noted in another thread, this 0 vac fuel pressure is not a show stopper, but it may make tuning for the 0 vac/boost transition more difficult.

Anyone willing to try the EJ22T FPR? I'm curious to see if it works. Pricewise, I would imagine it's the same as the SVX's FPR. World Auto, in Glendale CA, quoted me the same price for both ($50).
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Old 10-19-2001, 12:59 AM   #19
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our stock pressure is 43?
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Old 10-19-2001, 02:10 AM   #20
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Quote:
Originally posted by Andrew
our stock pressure is 43?
I think what he meant was that the pressure differential between the fuel rails and intake manifold is 43 psi. At idle, manifold vacuum is usually about 20 in. Hg., or approx. -10 psi. Therefore, you should expect about (-10 psi) + 43 psi = 33 psi fuel pressure if the stock FPR was designed to maintain 43 psi. Similarly at WOT, you should expect (0 psi) + 43 psi = 43 psi fuel pressure.

This is done so that the ECU does not need to compensate fuel injector duty cycles in response to changes in manifold pressure/vacuum. Otherwise, it would need to use the MAP voltage to modify the open-loop duty cycle fuel maps. Some problems are more easily solved with hardware.

-WaC
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Old 10-19-2001, 02:32 AM   #21
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so do you mean my vac should read 10 at idle? it always reads 20 on the boost gauge.
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Old 10-19-2001, 02:55 AM   #22
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Andrew:

Quote:
Originally posted by wac


At idle, manifold vacuum is usually about 20 in. Hg., or approx. -10 psi.
The vacuum side of your boost gauge should be metered in in. Hg, not psi. You're right in line with what Wayne said.
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Old 10-19-2001, 03:45 AM   #23
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Thumbs up

10-4
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Old 10-19-2001, 11:14 AM   #24
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I'm up for trying the EJ22-T FPR. There should be a wrecked Legacy near here which I have pulled other parts from. I'll check it out today. I am thinking my stock FPR has been overwhelmed by the high fuel pressure and is now doing wierd things, so it probably wouldn't hurt to try a new FPR anyhow.

[UPDATE] I figured this would happen. The place that had the motor (probably wouldn't part it out anyhow) has just recently sold the core motor. So, no EJ22-T FPR for me to try. I did locate an SVX FPR from Aaronsauto.com for $35 and it should be on its way.

From a boost fueling standpoint, the higher idle fuel pressure may actually HELP to prevent lean-run on throttle tip-in. I believe most of the Impreza's will go temporarily lean when you step on the throttle as the RRFPR hasnt had a chance to add the extra fuel needed for the instant boost. Staying away from the zener diodes helps combat this, but for the most part it is a matter of the RRFPR not reacting fast enough. I was thinking maybe the extra fuel pressure (already running rich before tip-in) might prevent it a little. You would just have to deal with the problems associated with a high idle fuel pressure, but that hasn't been a problem for me except a slighly sooty tailpipe.

-Jon
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Last edited by stimpy; 10-19-2001 at 01:42 PM.
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Old 10-19-2001, 03:48 PM   #25
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Quote:
Originally posted by stimpy

From a boost fueling standpoint, the higher idle fuel pressure may actually HELP to prevent lean-run on throttle tip-in. I believe most of the Impreza's will go temporarily lean when you step on the throttle as the RRFPR hasnt had a chance to add the extra fuel needed for the instant boost. Staying away from the zener diodes helps combat this, but for the most part it is a matter of the RRFPR not reacting fast enough. I was thinking maybe the extra fuel pressure (already running rich before tip-in) might prevent it a little. You would just have to deal with the problems associated with a high idle fuel pressure, but that hasn't been a problem for me except a slighly sooty tailpipe.

-Jon
www.nothingserious.net
This is what I was saying about trying out the EJ22T FPR (perhaps in another thread -- there were many along these lines lately), if indeed it can handle an RS-T flow. The 43psi nominal 0 vac fuel pressure may help prevent lean tip-in conditions, over the SVX's 36psi.

I don't regret the SVX FPR installation, though. Without this, my idle pressures varied from 40 to 45 to 50. I'd run lean some days, then rich some other days. At least now I have stable base pressure for the RRFPR to start rising from. If it was consistently say, 45psi, (and assuming this wasn't causing any other problems), I would've lived without it.
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